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Type: Artigo de periódico
Title: Properties of faujasite zeolites containing methyl-substituted ammonium cations
Author: Almeida, KA
Landers, R
Cardoso, D
Abstract: This paper describes the properties of new X zeolite catalysts, whose anions are compensated by different methylammonium cations. The properties of these catalysts, with varying degrees of exchange, are compared with those of Y zeolites containing the same cations. For steric reasons, cation exchange was restricted to the faujasite supercavity, and the degree of ion exchange decreased with the radius of the organic cation. The basicity of the catalysts was analyzed using X-ray photoelectron spectroscopy (XPS) and the Knoevenagel condensation reaction, with good correlation obtained between the results of the two methods. The best catalytic activity was observed for the faujasite with the highest aluminum content (X zeolite), exchanged using the monomethylammonium cation. The better performance of this catalyst was attributed to its basicity, as well as the available micropore volume. (C) 2012 Elsevier Inc. All rights reserved.
Subject: Faujasite
Base catalyst
Methylammonium cations
Knoevenagel condensation
Turnover frequency (TOF)
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.jcat.2012.07.017
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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