n-heptane reforming over Pt supported on beta zeolite exchanged with Cs and Li cations

被引：7
|
作者：
Ramírez, S
Viniegra, M
Domínguez, JM
Schacht, P
De Ménorval, LC
机构：
[1] Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Mexico City 09340, DF, Mexico
[2] Inst Mexicano Petr, STI, Programa Simulac Mol, Mexico City 07730, DF, Mexico
[3] Inst Mexicano Petr, Gerencia Catalizadores, Mexico City 07730, DF, Mexico
[4] ENSCM, Lab Mat Catalyt & Catalyse Chim Organ, CNRS, UMR 5618, F-34296 Montpellier 05, France
来源：
CATALYSIS LETTERS | 2000年 / 66卷 / 1-2期
关键词：
Pt; beta zeolite; ion exchange; n-heptane reforming;
D O I：
10.1023/A:1019058430711
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The physicochemical and catalytic properties of platinum supported on beta zeolite both acid and exchanged with Cs and Li cations were characterized by X-ray diffraction, NH3-TPD, FTIR of adsorbed pyridine and CO, DSC, mass spectrometry and hydrogen chemisorption. The n-heptane conversion was performed to assess the selectivity variations in the exchanged solids. A high metal dispersion was verified in all of the catalysts, varying from 54 up to 81%. The FTIR of adsorbed CO revealed a shift towards lower frequencies for Pt on exchanged zeolite with respect to Pt on the acid zeolite, indicating that the basic character of Cs and Li enhance the electron donation from the support to the metal. The acid-base properties of the exchanged materials influence their selectivity for the catalytic conversion of n-heptane at 663 K and 1 atm, showing that Cs promotes the aromatization reactions while Li promotes isomerization and cracking. The cracking activity followed the acid/metal ratio for all of the catalysts studied.
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页码：25 / 32
页数：8
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