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Conventional and wet proofed CuO/Al2O3 catalysts for phenol oxidation: deactivation studies in a trickle bed reactor
A large variety of catalytic systems have been studied for the catalytic wet air oxidation of phenolic solutions. Most of them show good activity, but serious stability problems. In this contribution, stability studies were performed over CuO/Al2O3 conventional (CNT) and polytetrafluorethylene coate...
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Published in: | Journal of chemical technology and biotechnology (1986) 2007-05, Vol.82 (5), p.481-487 |
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container_title | Journal of chemical technology and biotechnology (1986) |
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creator | Fenoglio, Rosa J Massa, Paola A Ivorra, Fernando D Haure, Patricia M |
description | A large variety of catalytic systems have been studied for the catalytic wet air oxidation of phenolic solutions. Most of them show good activity, but serious stability problems. In this contribution, stability studies were performed over CuO/Al2O3 conventional (CNT) and polytetrafluorethylene coated (C3T) catalysts used for the oxidation of 5 g L−1 phenol solutions in a trickle bed reactor (140 °C and 7 atm of oxygen pressure). For the hydrophilic catalyst, phenol conversion decreased with usage due to the formation of Cu2O and copper oxalate phases. For the wet proofed catalyst, the hydrophobic layer prevented the appearence of those phases, and conversion levels remained practically constant with reaction time. After usage, both catalysts were oxidized at 400 °C and tested for reaction: in the case of the C3T catalyst, the phenol conversion was increased over its initial level; for CNT catalyst, the phenol conversion was also increased, but initial levels were not completely restored. The deactivation mechanism of the CNT catalyst is associated with the formation of the Cu2O and copper oxalate phases during reaction. For catalyst C3T, practically no deactivation was observed. Copyright © 2007 Society of Chemical Industry |
doi_str_mv | 10.1002/jctb.1694 |
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Most of them show good activity, but serious stability problems. In this contribution, stability studies were performed over CuO/Al2O3 conventional (CNT) and polytetrafluorethylene coated (C3T) catalysts used for the oxidation of 5 g L−1 phenol solutions in a trickle bed reactor (140 °C and 7 atm of oxygen pressure). For the hydrophilic catalyst, phenol conversion decreased with usage due to the formation of Cu2O and copper oxalate phases. For the wet proofed catalyst, the hydrophobic layer prevented the appearence of those phases, and conversion levels remained practically constant with reaction time. After usage, both catalysts were oxidized at 400 °C and tested for reaction: in the case of the C3T catalyst, the phenol conversion was increased over its initial level; for CNT catalyst, the phenol conversion was also increased, but initial levels were not completely restored. The deactivation mechanism of the CNT catalyst is associated with the formation of the Cu2O and copper oxalate phases during reaction. For catalyst C3T, practically no deactivation was observed. Copyright © 2007 Society of Chemical Industry</description><identifier>ISSN: 0268-2575</identifier><identifier>EISSN: 1097-4660</identifier><identifier>DOI: 10.1002/jctb.1694</identifier><identifier>CODEN: JCTBDC</identifier><language>eng</language><publisher>Chichester, UK: John Wiley & Sons, Ltd</publisher><subject>Applied sciences ; Catalysis ; Catalytic reactions ; Chemical engineering ; Chemistry ; copper oxalate ; Cu2O ; CuO catalysts ; Exact sciences and technology ; General and physical chemistry ; hydrophobic catalysts ; phenol oxidation ; Reactors ; Theory of reactions, general kinetics. Catalysis. 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Chem. Technol. Biotechnol</addtitle><description>A large variety of catalytic systems have been studied for the catalytic wet air oxidation of phenolic solutions. Most of them show good activity, but serious stability problems. In this contribution, stability studies were performed over CuO/Al2O3 conventional (CNT) and polytetrafluorethylene coated (C3T) catalysts used for the oxidation of 5 g L−1 phenol solutions in a trickle bed reactor (140 °C and 7 atm of oxygen pressure). For the hydrophilic catalyst, phenol conversion decreased with usage due to the formation of Cu2O and copper oxalate phases. For the wet proofed catalyst, the hydrophobic layer prevented the appearence of those phases, and conversion levels remained practically constant with reaction time. After usage, both catalysts were oxidized at 400 °C and tested for reaction: in the case of the C3T catalyst, the phenol conversion was increased over its initial level; for CNT catalyst, the phenol conversion was also increased, but initial levels were not completely restored. The deactivation mechanism of the CNT catalyst is associated with the formation of the Cu2O and copper oxalate phases during reaction. For catalyst C3T, practically no deactivation was observed. Copyright © 2007 Society of Chemical Industry</description><subject>Applied sciences</subject><subject>Catalysis</subject><subject>Catalytic reactions</subject><subject>Chemical engineering</subject><subject>Chemistry</subject><subject>copper oxalate</subject><subject>Cu2O</subject><subject>CuO catalysts</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>hydrophobic catalysts</subject><subject>phenol oxidation</subject><subject>Reactors</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fenoglio, Rosa J</creatorcontrib><creatorcontrib>Massa, Paola A</creatorcontrib><creatorcontrib>Ivorra, Fernando D</creatorcontrib><creatorcontrib>Haure, Patricia M</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Aluminium Industry Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of chemical technology and biotechnology (1986)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fenoglio, Rosa J</au><au>Massa, Paola A</au><au>Ivorra, Fernando D</au><au>Haure, Patricia M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Conventional and wet proofed CuO/Al2O3 catalysts for phenol oxidation: deactivation studies in a trickle bed reactor</atitle><jtitle>Journal of chemical technology and biotechnology (1986)</jtitle><addtitle>J. Chem. Technol. Biotechnol</addtitle><date>2007-05</date><risdate>2007</risdate><volume>82</volume><issue>5</issue><spage>481</spage><epage>487</epage><pages>481-487</pages><issn>0268-2575</issn><eissn>1097-4660</eissn><coden>JCTBDC</coden><notes>ark:/67375/WNG-4CFF1V1F-C</notes><notes>istex:0224076649AF0A0BF8420889FEBCBB5E8272024E</notes><notes>ArticleID:JCTB1694</notes><notes>ObjectType-Article-2</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-1</notes><notes>content type line 23</notes><abstract>A large variety of catalytic systems have been studied for the catalytic wet air oxidation of phenolic solutions. Most of them show good activity, but serious stability problems. In this contribution, stability studies were performed over CuO/Al2O3 conventional (CNT) and polytetrafluorethylene coated (C3T) catalysts used for the oxidation of 5 g L−1 phenol solutions in a trickle bed reactor (140 °C and 7 atm of oxygen pressure). For the hydrophilic catalyst, phenol conversion decreased with usage due to the formation of Cu2O and copper oxalate phases. For the wet proofed catalyst, the hydrophobic layer prevented the appearence of those phases, and conversion levels remained practically constant with reaction time. After usage, both catalysts were oxidized at 400 °C and tested for reaction: in the case of the C3T catalyst, the phenol conversion was increased over its initial level; for CNT catalyst, the phenol conversion was also increased, but initial levels were not completely restored. The deactivation mechanism of the CNT catalyst is associated with the formation of the Cu2O and copper oxalate phases during reaction. For catalyst C3T, practically no deactivation was observed. Copyright © 2007 Society of Chemical Industry</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/jctb.1694</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Applied sciences Catalysis Catalytic reactions Chemical engineering Chemistry copper oxalate Cu2O CuO catalysts Exact sciences and technology General and physical chemistry hydrophobic catalysts phenol oxidation Reactors Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
title | Conventional and wet proofed CuO/Al2O3 catalysts for phenol oxidation: deactivation studies in a trickle bed reactor |
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