Related surface and heat of immersion characterization of some alumina samples
Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hy...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Khalil, A. M. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1991 |
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| Schlagwörter: |
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| Anmerkung: |
© Chapman & Hall 1991 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of materials science - Kluwer Academic Publishers, 1966, 26(1991), 21 vom: Nov., Seite 5698-5702 |
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| Übergeordnetes Werk: |
volume:26 ; year:1991 ; number:21 ; month:11 ; pages:5698-5702 |
| Links: |
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| DOI / URN: |
10.1007/BF01130104 |
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OLC2046182855 |
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| 245 | 1 | 0 | |a Related surface and heat of immersion characterization of some alumina samples |
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| 520 | |a Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. | ||
| 650 | 4 | |a Water Loss | |
| 650 | 4 | |a Cementation | |
| 650 | 4 | |a MnCl2 | |
| 650 | 4 | |a Pore Radius | |
| 650 | 4 | |a Capillary Condensation | |
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10.1007/BF01130104 doi (DE-627)OLC2046182855 (DE-He213)BF01130104-p DE-627 ger DE-627 rakwb eng 670 VZ Khalil, A. M. verfasserin aut Related surface and heat of immersion characterization of some alumina samples 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman & Hall 1991 Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. Water Loss Cementation MnCl2 Pore Radius Capillary Condensation Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 26(1991), 21 vom: Nov., Seite 5698-5702 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:26 year:1991 number:21 month:11 pages:5698-5702 https://doi.org/10.1007/BF01130104 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4316 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 26 1991 21 11 5698-5702 |
| spelling |
10.1007/BF01130104 doi (DE-627)OLC2046182855 (DE-He213)BF01130104-p DE-627 ger DE-627 rakwb eng 670 VZ Khalil, A. M. verfasserin aut Related surface and heat of immersion characterization of some alumina samples 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman & Hall 1991 Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. Water Loss Cementation MnCl2 Pore Radius Capillary Condensation Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 26(1991), 21 vom: Nov., Seite 5698-5702 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:26 year:1991 number:21 month:11 pages:5698-5702 https://doi.org/10.1007/BF01130104 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4316 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 26 1991 21 11 5698-5702 |
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10.1007/BF01130104 doi (DE-627)OLC2046182855 (DE-He213)BF01130104-p DE-627 ger DE-627 rakwb eng 670 VZ Khalil, A. M. verfasserin aut Related surface and heat of immersion characterization of some alumina samples 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman & Hall 1991 Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. Water Loss Cementation MnCl2 Pore Radius Capillary Condensation Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 26(1991), 21 vom: Nov., Seite 5698-5702 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:26 year:1991 number:21 month:11 pages:5698-5702 https://doi.org/10.1007/BF01130104 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4316 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 26 1991 21 11 5698-5702 |
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10.1007/BF01130104 doi (DE-627)OLC2046182855 (DE-He213)BF01130104-p DE-627 ger DE-627 rakwb eng 670 VZ Khalil, A. M. verfasserin aut Related surface and heat of immersion characterization of some alumina samples 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman & Hall 1991 Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. Water Loss Cementation MnCl2 Pore Radius Capillary Condensation Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 26(1991), 21 vom: Nov., Seite 5698-5702 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:26 year:1991 number:21 month:11 pages:5698-5702 https://doi.org/10.1007/BF01130104 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4316 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 26 1991 21 11 5698-5702 |
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10.1007/BF01130104 doi (DE-627)OLC2046182855 (DE-He213)BF01130104-p DE-627 ger DE-627 rakwb eng 670 VZ Khalil, A. M. verfasserin aut Related surface and heat of immersion characterization of some alumina samples 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman & Hall 1991 Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. Water Loss Cementation MnCl2 Pore Radius Capillary Condensation Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 26(1991), 21 vom: Nov., Seite 5698-5702 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:26 year:1991 number:21 month:11 pages:5698-5702 https://doi.org/10.1007/BF01130104 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4316 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 26 1991 21 11 5698-5702 |
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M.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Related surface and heat of immersion characterization of some alumina samples</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1991</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Chapman & Hall 1991</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. 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related surface and heat of immersion characterization of some alumina samples |
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Related surface and heat of immersion characterization of some alumina samples |
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Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. © Chapman & Hall 1991 |
| abstractGer |
Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. © Chapman & Hall 1991 |
| abstract_unstemmed |
Abstract $ MnCl_{2} $- and $ CuCl_{2} $-loaded aluminas were thermally treatedin vacuo in the temperature range 20–500 °C. The water loss, specific surface area from nitrogen adsorption measurements and the integral heat of immersion in water were determined for all the samples. The high-pressure hysteresis loop displayed in the adsorption isotherms, together with the limited increase in adsorption values near saturation indicate the dominance of mesopores in the tested samples, as also detected by theVa-t method of isotherm analysis. Changes in the slope ofVa-t plots suggests that the mesopores rather belong to narrow-ranged mesopore sizes, which are thus considered responsible for adsorption in thet-ranges of 0.5–0.7 and above 0.7 nm. The constancy ofVa($ mlg^{−1} $) values abovet=1.2 nm points out the absence of effective capillary condensation in the high relative pressure region. Variations of BET-surface area and the reciprocal of average pore radius, ¯$ r^{−1} $ ($ nm^{−1} $), as functions of the heat-treatment temperature indicate that $ MnCl_{2} $-loaded samples display a higher thermal stability than $ CuCl_{2} $-loaded samples; the latter exhibit some aggregation cementation behaviour. At temperatures below 300 °C, the heat of immersion data are not as predicted from changes in water loss and surface-area parameters. Thus, $ MnCl_{2} $-loaded samples display lower heat of immersion values than the respective $ CuCl_{2} $-loaded samples, despite the higher BET areas of the former samples; an effect which may be tentatively interpreted in terms of the capability of the smaller sized $ Mn^{2+} $ ions to preserve more water molecules via such processes as complex formation, ion hydration and crystallization, which contribute to lowering the integral heat measured. This apparent discrepancy in the behaviour of integral heat of immersion ($ Jg^{−1} $) data with water loss ($ gg^{−1} $) at temperatures below 300°C is clarified by considering the change in the heat of immersion per unit area,hi (J $ m^{−2} $) with the temperature of treatment. © Chapman & Hall 1991 |
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