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Naturally-Occurring Silicates as Carriers for Copper Catalysts used in Methanol Conversion

Published online by Cambridge University Press:  28 February 2024

M. R. Sun Kou ,
S. Mendioroz ,
J. L. G. Fierro ,
I. Rodriguez-Ramos ,
J. M. Palacios ,
A. Guerrero-Ruiz  and
A. M. De Andres
M. R. Sun Kou
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Campus UAM, Cantoblanco, 28049 Madrid, Spain
S. Mendioroz
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Campus UAM, Cantoblanco, 28049 Madrid, Spain
J. L. G. Fierro
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Campus UAM, Cantoblanco, 28049 Madrid, Spain
I. Rodriguez-Ramos
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Campus UAM, Cantoblanco, 28049 Madrid, Spain
J. M. Palacios
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C. Campus UAM, Cantoblanco, 28049 Madrid, Spain
A. Guerrero-Ruiz
Affiliation:
Departamento de Química Inorgánica, UNED, Senda del Rey, s/n, 28028 Madrid, Spain
A. M. De Andres
Affiliation:
Instituto de Ciencia de Materiales, C.S.I.C, Serrano 119, 28006 Madrid, Spain
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Abstract

Bentonite- and sepiolite-supported copper catalysts have been prepared either by adsorption of Cu(II) from aqueous solutions of copper nitrate at pH ~4.5 or by adsorption of a [Cu(NH3)4]2+ complex from an ammonia solution of CuSO4 at pH ~9.5. The structure and composition of the calcined preparations have been studied by X-ray diffraction, chemical analysis, and energy dispersive X-rays. Textural characteristics have derived from the analysis of the adsorption-desorption isotherms of N2. All catalysts have been tested for the dehydrogenation of methanol to methyl formate. For this reaction, bentonite-based catalysts were found to have very little activity, which indicates that copper located in the inter-lamellar spaces is inaccessible to methanol molecules. On the contrary, copper-sepiolite catalysts showed a very high specific activity even for those catalysts with a very low copper content. The chemical state of copper in the catalysts on-stream has been revealed by X-ray photoelectron spectroscopy and X-ray-induced Auger techniques. In most of the catalysts Cu+ is the dominant copper species.

Keywords

BentoniteCopper catalystsMethanol dehydrogenationSepiolite
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 2 , April 1992 , pp. 167 - 174
Copyright
Copyright © 1992, The Clay Minerals Society

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