COMPARED FORMATION OF LIGHT PRODUCTS IN N-ALKANE CRACKING IN SAPO-37 AND SI-AL FAUJASITES - ENERGY GRADIENT SELECTIVITY

被引：6

作者：

BARTHOMEUF, D

机构：

[1] Laboratoire de Réactivité de Surface, URA 1106 CNRS, Université Pierre et Marie Curie, 75252 Paris Cédex 05

来源：

APPLIED CATALYSIS A-GENERAL | 1995年 / 126卷 / 01期

关键词：

CHARGE DISTRIBUTION; CRACKING; SAPO-37; SELECTIVITY (LIGHT HYDROCARBONS); SILICON CONTENT; ZEOLITES;

D O I：

10.1016/0926-860X(94)00290-8

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 selectivity to light hydrocarbons (C-2, C-3) in the cracking of alkanes expressed by the C-2/C-4 or C-3/C-4 ratios is the highest for zeolites with a heterogeneous distribution of charges. This energy gradient selectivity concept found for Si-Al zeolites is shown to extend to Sapo-37. The two ratios are lower for the template-free Sapo-37 pretreated at 873 K and having isolated SiO4 tetrahedra in the framework. At higher pretreatment temperature or/and high Si content (Si atomic ratio > 0.125) the production of light hydrocarbons is increased in the heterogeneous energy gradient present in the cage, related to the presence of silicon islands.

引用

页码：187 / 194

页数：8

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