n-HEPTANE AND METHYLCYCLOHEXANE TRANSFORMATION OVER A HMCM-22 ZEOLITE. ORIGIN OF THE FEATURES TYPICAL OF LARGE-OR OF MEDIUM-PORE ZEOLITES

被引：3

作者：

Matias, Patricia ^{[1
,2
]}

Lopes, Jose Manuel ^{[1
]}

Laforge, Sebastien ^{[2
]}

Magnoux, Patrick ^{[2
]}

Guisnet, Michel ^{[1
,2
]}

Ribeiro, Fernando Ramoa ^{[1
]}

机构：

[1] Inst Super Tecn, Ctr Biol & Chem Engn, IBB, P-1049001 Lisbon, Portugal

[2] Univ Poitiers, Catalyse Chim Organ Lab, F-86022 Poitiers, France

来源：

REACTION KINETICS AND CATALYSIS LETTERS | 2008年 / 95卷 / 01期

关键词：

H-MCM-22; H-USY; H-MFI; methylcyclohexane and n-heptane cracking;

D O I：

10.1007/s11144-008-5394-3

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 main features of methylcyclohexane (mch) and n-heptane (n-C-7) transformation at 350 degrees C were compared for fresh samples of HMWW, HMFI and HFAU zeolites. With both reactions, the behavior of HMWW was between those of the medium HMFI and large pore HFAU zeolites. Thus, the values of turnover frequency (TOF) and of the TOFmch/n-C7 ratio were similar with HMWW and HMFI and much higher with HFAU. In contrast, small differences were found between product distributions over HMWW and HFAU but large differences between HMWW and HMFI. These observations can be explained by alkane transformation in the large supercages with 10-MR apertures of HMWW: the narrow apertures limit diffusion of the mch within the supercages, but not the diffusion of the products which are therefore typical of the transformation within large cages hence without any steric limitation.

引用

页码：193 / 201

页数：9

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