Isomerization of n-hexane on Pt-Ni catalysts supported on nanocrystalline H-BEA zeolite

被引：39
|
作者：
Lima, Patricia M. [1 ]
Garetto, Teresita [2 ]
Cavalcante, Celio L., Jr. [3 ]
Cardoso, Dilson [4 ]
机构：
[1] Univ Brasilia, Inst Chem, BR-70910900 Brasilia, DF, Brazil
[2] INCAPE, Catalysis Sci & Engn Res Grp, RA-3000 Santa Fe, Argentina
[3] Univ Fed Ceara, Dept Chem Engn, Fortaleza, Ceara, Brazil
[4] Univ Fed Sao Carlos, Dept Chem Engn, BR-13560 Sao Carlos, SP, Brazil
来源：
CATALYSIS TODAY | 2011年 / 172卷 / 01期
关键词：
Alkane isomerization; Beta zeolite; Nanosized crystals; Bimetallic catalyst; BETA-ZEOLITE; HYDROISOMERIZATION; HEPTANE; PLATINUM; PARAFFINS; HYDROGENATION; SELECTIVITY; FEED;
D O I：
10.1016/j.cattod.2011.02.031
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The zeolite Beta used in this work consists of nanosized crystallites (20-30 nm) aggregates, determined by HRTEM analysis. The influence of the zeolite structure and crystallite size on the desorption rates of linear paraffins was determined by ZLC chromatography. Desorption from Beta zeolite was faster than from USY zeolite. IR acidity analysis by adsorption and desorption of pyridine showed that Beta zeolite has a smaller number of Bronsted acid sites than USY zeolite, but that they are a little stronger. Pt-Ni/H-BEA catalysts showed higher activity than Pt-Ni/H-USY ones. This behavior can be attributed to the very small crystallites of Beta zeolite, which enable faster diffusion of the reactant and products molecules. Among bimetallic catalysts, the highest activity was observed with that containing 60% Pt. This result is very interesting in view of the cost reduction, relative to 100% Pt catalyst. (C) 2011 Elsevier B. V. All rights reserved.
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收藏
页码：195 / 202
页数：8
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