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Type: Artigo de periódico
Title: Effects of Cu over Pd based catalysts supported on silica or niobia
Author: Roma, M.N.S.C.
Cunha, D.S.
Cruz, G.M.
Cobo, A.J.G.
Abstract: Palladium and palladium-copper catalysts supported on silica and niobia were characterized by H2 chemisorption and H2-O2 titration. Systems over silica were also analyzed by transmission electron microscopy and EXAFS. The metallic dispersion decreased from 20% to 7% when the content of Pd was increased from 0.5wt.-% to 3wt.-% in monometallic catalysts. The addition of 3 wt.-% Cu to obtain Pd-Cu catalysts caused a remarkable capacity loss of hydrogen chemisorption. TPR analysis suggested an interaction between the two metals and EXAFS characterization of the catalyst supported on silica confirmed the formation of Pd-Cu alloy. Pd/Nb2O5 catalysts showed turnover numbers higher than those obtained with the Pd/SiO2 systems in the cyclohexane dehydrogenation. However, the bimetallic catalysts showed very low turnover numbers.
Subject: bimetallic catalysts
cyclohexane dehydrogenation
Editor: Brazilian Society of Chemical Engineering
Citation: Brazilian Journal of Chemical Engineering. Brazilian Society of Chemical Engineering, v. 17, n. 4-7, p. 937-946, 2000.
Rights: aberto
Identifier DOI: 10.1590/S0104-66322000000400058
Date Issue: 1-Dec-2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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