Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability

The deposition of condensation by-products onto the catalyst surface upon wet peroxide and wet air oxidation processes has usually been associated with catalyst deactivation. However, in Part I of this paper, it was demonstrated that these carbonaceous deposits actually act as catalytic promoters in...
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Autor*in:	Asunción Quintanilla [verfasserIn] Jose L. Diaz de Tuesta [verfasserIn] Cristina Figueruelo [verfasserIn] Macarena Munoz [verfasserIn] Jose A. Casas [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Schlagwörter:	wet peroxide oxidation wet air oxidation condensation by-products nature fouling autocatalytic kinetics

Übergeordnetes Werk:	In: Catalysts - MDPI AG, 2012, 9(2019), 6, p 518
Übergeordnetes Werk:	volume:9 ; year:2019 ; number:6, p 518

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/catal9060518

Katalog-ID:	DOAJ015199975

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520			\|a The deposition of condensation by-products onto the catalyst surface upon wet peroxide and wet air oxidation processes has usually been associated with catalyst deactivation. However, in Part I of this paper, it was demonstrated that these carbonaceous deposits actually act as catalytic promoters in the oxygen-assisted wet peroxide oxidation (WPO-O<sub<2</sub<) of phenol. Herein, the intrinsic activity, nature and stability of these species have been investigated. To achieve this goal, an up-flow fixed bed reactor packed with porous Al<sub<2</sub<O<sub<3</sub< spheres was used to facilitate the deposition of the condensation by-products formed in the liquid phase. It was demonstrated that the condensation by-products catalyzed the decomposition of H<sub<2</sub<O<sub<2</sub< and a higher amount of these species leads to a higher degree of oxidation degree The reaction rates, conversion values and intermediates’ distribution were analyzed. The characterization of the carbonaceous deposits on the Al<sub<2</sub<O<sub<3</sub< spheres showed a significant amount of condensation by-products (~6 wt.%) after 650 h of time on stream. They are of aromatic nature and present oxygen functional groups consisting of quinones, phenols, aldehydes, carboxylics and ketones. The initial phenol concentration and H<sub<2</sub<O<sub<2</sub< dose were found to be crucial variables for the generation and consumption of such species, respectively.
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callnumber-first	T - Technology
author	Asunción Quintanilla
spellingShingle	Asunción Quintanilla misc TP1-1185 misc QD1-999 misc wet peroxide oxidation misc wet air oxidation misc condensation by-products nature misc fouling misc autocatalytic kinetics misc Chemical technology misc Chemistry Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability
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topic_title	TP1-1185 QD1-999 Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability wet peroxide oxidation wet air oxidation condensation by-products nature fouling autocatalytic kinetics
topic	misc TP1-1185 misc QD1-999 misc wet peroxide oxidation misc wet air oxidation misc condensation by-products nature misc fouling misc autocatalytic kinetics misc Chemical technology misc Chemistry
topic_unstemmed	misc TP1-1185 misc QD1-999 misc wet peroxide oxidation misc wet air oxidation misc condensation by-products nature misc fouling misc autocatalytic kinetics misc Chemical technology misc Chemistry
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title	Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability
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title_full	Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability
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title_sort	condensation by-products in wet peroxide oxidation: fouling or catalytic promotion? part ii: activity, nature and stability
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title_auth	Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability
abstract	The deposition of condensation by-products onto the catalyst surface upon wet peroxide and wet air oxidation processes has usually been associated with catalyst deactivation. However, in Part I of this paper, it was demonstrated that these carbonaceous deposits actually act as catalytic promoters in the oxygen-assisted wet peroxide oxidation (WPO-O<sub<2</sub<) of phenol. Herein, the intrinsic activity, nature and stability of these species have been investigated. To achieve this goal, an up-flow fixed bed reactor packed with porous Al<sub<2</sub<O<sub<3</sub< spheres was used to facilitate the deposition of the condensation by-products formed in the liquid phase. It was demonstrated that the condensation by-products catalyzed the decomposition of H<sub<2</sub<O<sub<2</sub< and a higher amount of these species leads to a higher degree of oxidation degree The reaction rates, conversion values and intermediates’ distribution were analyzed. The characterization of the carbonaceous deposits on the Al<sub<2</sub<O<sub<3</sub< spheres showed a significant amount of condensation by-products (~6 wt.%) after 650 h of time on stream. They are of aromatic nature and present oxygen functional groups consisting of quinones, phenols, aldehydes, carboxylics and ketones. The initial phenol concentration and H<sub<2</sub<O<sub<2</sub< dose were found to be crucial variables for the generation and consumption of such species, respectively.
abstractGer	The deposition of condensation by-products onto the catalyst surface upon wet peroxide and wet air oxidation processes has usually been associated with catalyst deactivation. However, in Part I of this paper, it was demonstrated that these carbonaceous deposits actually act as catalytic promoters in the oxygen-assisted wet peroxide oxidation (WPO-O<sub<2</sub<) of phenol. Herein, the intrinsic activity, nature and stability of these species have been investigated. To achieve this goal, an up-flow fixed bed reactor packed with porous Al<sub<2</sub<O<sub<3</sub< spheres was used to facilitate the deposition of the condensation by-products formed in the liquid phase. It was demonstrated that the condensation by-products catalyzed the decomposition of H<sub<2</sub<O<sub<2</sub< and a higher amount of these species leads to a higher degree of oxidation degree The reaction rates, conversion values and intermediates’ distribution were analyzed. The characterization of the carbonaceous deposits on the Al<sub<2</sub<O<sub<3</sub< spheres showed a significant amount of condensation by-products (~6 wt.%) after 650 h of time on stream. They are of aromatic nature and present oxygen functional groups consisting of quinones, phenols, aldehydes, carboxylics and ketones. The initial phenol concentration and H<sub<2</sub<O<sub<2</sub< dose were found to be crucial variables for the generation and consumption of such species, respectively.
abstract_unstemmed	The deposition of condensation by-products onto the catalyst surface upon wet peroxide and wet air oxidation processes has usually been associated with catalyst deactivation. However, in Part I of this paper, it was demonstrated that these carbonaceous deposits actually act as catalytic promoters in the oxygen-assisted wet peroxide oxidation (WPO-O<sub<2</sub<) of phenol. Herein, the intrinsic activity, nature and stability of these species have been investigated. To achieve this goal, an up-flow fixed bed reactor packed with porous Al<sub<2</sub<O<sub<3</sub< spheres was used to facilitate the deposition of the condensation by-products formed in the liquid phase. It was demonstrated that the condensation by-products catalyzed the decomposition of H<sub<2</sub<O<sub<2</sub< and a higher amount of these species leads to a higher degree of oxidation degree The reaction rates, conversion values and intermediates’ distribution were analyzed. The characterization of the carbonaceous deposits on the Al<sub<2</sub<O<sub<3</sub< spheres showed a significant amount of condensation by-products (~6 wt.%) after 650 h of time on stream. They are of aromatic nature and present oxygen functional groups consisting of quinones, phenols, aldehydes, carboxylics and ketones. The initial phenol concentration and H<sub<2</sub<O<sub<2</sub< dose were found to be crucial variables for the generation and consumption of such species, respectively.
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container_issue	6, p 518
title_short	Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability
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author2	Jose L. Diaz de Tuesta Cristina Figueruelo Macarena Munoz Jose A. Casas
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Condensation By-Products in Wet Peroxide Oxidation: Fouling or Catalytic Promotion? Part II: Activity, Nature and Stability

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