Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/107353
Type: Artigo de periódico
Title: Palladium, Palladium-tin, And Palladium-silver Catalysts In The Selective Hydrogenation Of Hexadienes: Tpr, Mössbauer, And Infrared Studies Of Adsorbed Co
Author: Sales E.A.
Jove J.
De Jesus Mendes M.
Bozon-Verduraz F.
Abstract: Alumina-supported Pd-Sn catalysts prepared by successive impregnation of the precursors, calcination, and reduction contain SnO 2 and SnAl 2O 5, Pd-Sn solid solutions, and intermetallic phases Pd 2Sn and Pd 3Sn. The formation of Pd 3Sn is favored not only by lowering the Sn/Pd ratio but also by introducing tin through ethanolic impregnation. The dilution of surface Pd atoms is confirmed by infrared spectroscopy of adsorbed CO: when the Sn/Pd ratio increases, the linear/bridged intensity ratio increases and the dipole-dipole interactions decrease. TPR experiments show the influence of the support acidity and of the preparation procedure on the reducibility of the various Pd-Sn and Pd-Ag species; in the case of Pd-Ag catalysts, the presence of silver postpones the reduction of PdO in calcined samples. © 2000 Academic Press.
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Rights: fechado
Identifier DOI: 10.1006/jcat.2000.2967
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0002807696&partnerID=40&md5=698374fee1023718b1753c53354f6e9c
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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