Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $
Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Chen, Chunxia [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2005 |
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| Schlagwörter: |
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| Anmerkung: |
© Science in China Press 2004 |
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| Übergeordnetes Werk: |
Enthalten in: Science in China / B - Science in China Press, 1989, 48(2005), 6 vom: Nov., Seite 530-537 |
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| Übergeordnetes Werk: |
volume:48 ; year:2005 ; number:6 ; month:11 ; pages:530-537 |
| Links: |
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| DOI / URN: |
10.1360/042004-66 |
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| Katalog-ID: |
OLC2035788234 |
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| 245 | 1 | 0 | |a Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ |
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| 520 | |a Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. | ||
| 650 | 4 | |a rare earth | |
| 650 | 4 | |a hydrotalcite | |
| 650 | 4 | |a microwave irradiation | |
| 650 | 4 | |a phenol hydroxylation | |
| 650 | 4 | |a kinetics | |
| 650 | 4 | |a reaction mechanism | |
| 700 | 1 | |a Xu, Chenghua |4 aut | |
| 700 | 1 | |a Feng, Iangrong |4 aut | |
| 700 | 1 | |a Suo, Jishuan |4 aut | |
| 700 | 1 | |a Qiu, Fali |4 aut | |
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10.1360/042004-66 doi (DE-627)OLC2035788234 (DE-He213)042004-66-p DE-627 ger DE-627 rakwb eng 540 570 550 VZ 540 550 570 VZ 11 12 ssgn BIODIV DE-30 fid Chen, Chunxia verfasserin aut Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ 2005 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2004 Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. rare earth hydrotalcite microwave irradiation phenol hydroxylation kinetics reaction mechanism Xu, Chenghua aut Feng, Iangrong aut Suo, Jishuan aut Qiu, Fali aut Enthalten in Science in China / B Science in China Press, 1989 48(2005), 6 vom: Nov., Seite 530-537 (DE-627)130464953 (DE-600)740629-0 (DE-576)022978976 1006-9291 nnns volume:48 year:2005 number:6 month:11 pages:530-537 https://doi.org/10.1360/042004-66 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-OAS SSG-OLC-MFO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 AR 48 2005 6 11 530-537 |
| spelling |
10.1360/042004-66 doi (DE-627)OLC2035788234 (DE-He213)042004-66-p DE-627 ger DE-627 rakwb eng 540 570 550 VZ 540 550 570 VZ 11 12 ssgn BIODIV DE-30 fid Chen, Chunxia verfasserin aut Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ 2005 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2004 Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. rare earth hydrotalcite microwave irradiation phenol hydroxylation kinetics reaction mechanism Xu, Chenghua aut Feng, Iangrong aut Suo, Jishuan aut Qiu, Fali aut Enthalten in Science in China / B Science in China Press, 1989 48(2005), 6 vom: Nov., Seite 530-537 (DE-627)130464953 (DE-600)740629-0 (DE-576)022978976 1006-9291 nnns volume:48 year:2005 number:6 month:11 pages:530-537 https://doi.org/10.1360/042004-66 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-OAS SSG-OLC-MFO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 AR 48 2005 6 11 530-537 |
| allfields_unstemmed |
10.1360/042004-66 doi (DE-627)OLC2035788234 (DE-He213)042004-66-p DE-627 ger DE-627 rakwb eng 540 570 550 VZ 540 550 570 VZ 11 12 ssgn BIODIV DE-30 fid Chen, Chunxia verfasserin aut Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ 2005 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2004 Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. rare earth hydrotalcite microwave irradiation phenol hydroxylation kinetics reaction mechanism Xu, Chenghua aut Feng, Iangrong aut Suo, Jishuan aut Qiu, Fali aut Enthalten in Science in China / B Science in China Press, 1989 48(2005), 6 vom: Nov., Seite 530-537 (DE-627)130464953 (DE-600)740629-0 (DE-576)022978976 1006-9291 nnns volume:48 year:2005 number:6 month:11 pages:530-537 https://doi.org/10.1360/042004-66 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-OAS SSG-OLC-MFO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 AR 48 2005 6 11 530-537 |
| allfieldsGer |
10.1360/042004-66 doi (DE-627)OLC2035788234 (DE-He213)042004-66-p DE-627 ger DE-627 rakwb eng 540 570 550 VZ 540 550 570 VZ 11 12 ssgn BIODIV DE-30 fid Chen, Chunxia verfasserin aut Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ 2005 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2004 Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. rare earth hydrotalcite microwave irradiation phenol hydroxylation kinetics reaction mechanism Xu, Chenghua aut Feng, Iangrong aut Suo, Jishuan aut Qiu, Fali aut Enthalten in Science in China / B Science in China Press, 1989 48(2005), 6 vom: Nov., Seite 530-537 (DE-627)130464953 (DE-600)740629-0 (DE-576)022978976 1006-9291 nnns volume:48 year:2005 number:6 month:11 pages:530-537 https://doi.org/10.1360/042004-66 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-OAS SSG-OLC-MFO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 AR 48 2005 6 11 530-537 |
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10.1360/042004-66 doi (DE-627)OLC2035788234 (DE-He213)042004-66-p DE-627 ger DE-627 rakwb eng 540 570 550 VZ 540 550 570 VZ 11 12 ssgn BIODIV DE-30 fid Chen, Chunxia verfasserin aut Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ 2005 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Science in China Press 2004 Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. rare earth hydrotalcite microwave irradiation phenol hydroxylation kinetics reaction mechanism Xu, Chenghua aut Feng, Iangrong aut Suo, Jishuan aut Qiu, Fali aut Enthalten in Science in China / B Science in China Press, 1989 48(2005), 6 vom: Nov., Seite 530-537 (DE-627)130464953 (DE-600)740629-0 (DE-576)022978976 1006-9291 nnns volume:48 year:2005 number:6 month:11 pages:530-537 https://doi.org/10.1360/042004-66 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-OAS SSG-OLC-MFO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_22 GBV_ILN_70 AR 48 2005 6 11 530-537 |
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Enthalten in Science in China / B 48(2005), 6 vom: Nov., Seite 530-537 volume:48 year:2005 number:6 month:11 pages:530-537 |
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Chen, Chunxia @@aut@@ Xu, Chenghua @@aut@@ Feng, Iangrong @@aut@@ Suo, Jishuan @@aut@@ Qiu, Fali @@aut@@ |
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The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. 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Chen, Chunxia |
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Chen, Chunxia ddc 540 ssgn 11 fid BIODIV misc rare earth misc hydrotalcite misc microwave irradiation misc phenol hydroxylation misc kinetics misc reaction mechanism Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ |
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Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ |
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kinetics and reaction mechanism of phenol hydroxylation catalyzed by la-$ cu_{4} $$ fealco_{3} $ |
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Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAlCO_{3} $ |
| abstract |
Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. © Science in China Press 2004 |
| abstractGer |
Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. © Science in China Press 2004 |
| abstract_unstemmed |
Abstract The present work synthesizes La-$ Cu_{4} $$ FeAICO_{3} $ catalyst under microwave irradiation and characterizes its structure using XRD and IR techniques. The results show that the obtained La-$ Cu_{4} $$ FeAICO_{3} $ has a hydrotalcite structure. In the phenol hydroxylation with $ H_{2} $$ O_{2} $ catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, the effects of reaction time and phenol/$ H_{2} $$ O_{2} $ molar ratio on the phenol hydroxylation, and relationships between the initial hydroxylation rate with concentration of the catalyst, phenol, $ H_{2} $$ O_{2} $ and reaction temperature are also investigated in details. It is shown the phenol conversion can reach 50.09% (mol percent) in the phenol hydroxylation catalyzed by La-$ Cu_{4} $$ FeAICO_{3} $, under the reaction conditions of the molar ratio of phenol/$ H_{2} $$ O_{2} $1/2, the amount ratio of phenol/catalyst 20, reaction temperature 343 K, reaction time 120 min, 10 ml_ distilled water as solvent. Moreover, a kinetic equation of v = k[La-$ Cu_{4} $$ FeAlCO_{3} $][$ C_{6} $$ H_{5} $OH][$ H_{2} $$ O_{2} $]. and the activation energy of Ea=58.37 kJ/mol are obtained according to the kinetic studies. Due to the fact that the HO-$ Cu^{+} $-OH species are detected in La-$ Cu_{4} $$ FeAICO_{3} $/$ H_{2} $$ O_{2} $ system by XPS, the new mechanism about the generation of hydroxyl free radicals in the phenol hydroxylation is proposed, which is supposed that HO-$ Cu^{+} $-OH species are transition state in this reaction. © Science in China Press 2004 |
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