Characterization of acid sites on gamma-alumina and chlorinated gamma-alumina by P-31 NMR of adsorbed trimethylphosphine

被引：24

作者：

Guillaume, D

Gautier, S

Despujol, I

Alario, F

Beccat, P

机构：

来源：

CATALYSIS LETTERS | 1997年 / 43卷 / 3-4期

关键词：

NMR; TMP; thermodesorption; acid sites; strength distribution; gamma alumina; chlorine;

D O I：

10.1023/A:1018955025955

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：

P-31 MAS NMR of adsorbed trimethylphosphine (TMP) has been used to characterize the surface acid properties of gamma-alumina and chlorinated gamma-alumina. Combined with thermodesorption of TMP, NMR has allowed the determination of the strength distribution of Bronsted and Lewis acid sites on these samples. gamma-alumina chlorination with 1,2-dichloropropane at 500 degrees C first increases the numbers of ''strong'' Lewis and ''strong'' Bronsted acid sites, second decreases the number of ''weak'' Lewis acid sites. The ''strong'' sites are the ones TMP is desorbed from above 200 degrees C and the ''weak'' sites up to 200 degrees C.

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页码：213 / 218

页数：6

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