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Ag/SiO2 and Cu/SiO2 cogelled xerogel catalysts for benzene combustion and 2-butanol deshydrogenation
Mahy, Julien; Claude, Vincent; Tasseroul, Ludivine et al.
2016The 11th Natural Gas Conversion Symposium – NGCS 11
Peer reviewed
 

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Keywords :
Sol-gel process; xerogel catalysts; alcohol deshydrogenation; benzene combustion
Abstract :
[en] Tars are recognized as major impurities when biomass is gazified into Syngas (mixture CO + H2) or when the methane reforming was produced from sustainaible reagents [1]. Therefore, fundamental knowledge of catalytic oxidation and deshydrogenation mechanisms can be valuable to develop effective methods to control syngas or methane pollution. A very important concern about cogelled catalysts is the accessibility of the active centers. Because the silver and copper is located inside silica particles, there is a risk that it may not be accessible. In the case of benzene oxidation, it was observed that the specific activity (mol s-1 g-1Ag) of Ag/SiO2 and Cu/SiO2 catalysts increases when the silver or copper loading decreases (Fig. 1). In fact, visual observations by TEM showed that in samples Ag0.25, Ag0.45, Ag1.05 and Cu1.00, there are not silver or copper particles located on silica particles external surface and then the metal dispersion values are greater in these samples. So, it is the proof that Ag and Cu particles located inside the silica particles are accessible for benzene in this catalytic system. In the case of 2-butanol dehydrogenation, the specific activity of Cu/SiO2 catalysts increases when the copper loading increases or when the metal dispersion values decreases (Fig. 2). However, in Cu1.00 sample, copper particles inside silica particles only are observed by TEM. It seems that these metallic particles are accessible for 2-butanol in this catalytic system.
Disciplines :
Materials science & engineering
Chemical engineering
Author, co-author :
Mahy, Julien  ;  Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable
Claude, Vincent ;  Université de Liège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Tasseroul, Ludivine ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries
Gaigneaux, Eric
Lambert, Stéphanie  ;  Université de Liège > Department of Chemical Engineering > Department of Chemical Engineering
Language :
English
Title :
Ag/SiO2 and Cu/SiO2 cogelled xerogel catalysts for benzene combustion and 2-butanol deshydrogenation
Publication date :
08 June 2016
Event name :
The 11th Natural Gas Conversion Symposium – NGCS 11
Event place :
Tromso, Norway
Event date :
du 5 au 9 juin 2016
Audience :
International
Peer reviewed :
Peer reviewed
Available on ORBi :
since 06 July 2016

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