Influence of Acid Sites on Xylene Transport in MFI Type Zeolites

被引：4

作者：

Baumgaertl, Martin ^{[1
,2
]}

Jentys, Andreas ^{[1
,2
]}

Lercher, Johannes A. ^{[1
,2
]}

机构：

[1] Tech Univ Munich, Dept Chem, D-85747 Garching, Germany

[2] Tech Univ Munich, Catalysis Res Ctr, D-85747 Garching, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2020年 / 124卷 / 07期

关键词：

INTRACRYSTALLINE DIFFUSION; ISOMERIZATION; ZSM-5; MOLECULES; MIXTURES; SORPTION; BENZENE;

D O I：

10.1021/acs.jpcc.9b11437

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 influence of Bronsted acidic sites at the pore entrance of MFI type zeolites on the transport of p-xylene was investigated by comparing the diffusion rates on samples with and without Al. The pore entrance rate is directly proportional to the concentration of molecules on the external surface. Bronsted acid sites lead to a higher sorption equilibrium constant of xylene because of stronger binding by about 3 kJ.mol(-1), compared to a neutral surface. The stronger binding energy reduces the apparent but not the true energy of activation for the pore entrance step of p-xylene, leading to an enhanced pore entrance rate.

引用

页码：4134 / 4140

页数：7

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