In situ MAS NMR spectroscopic investigation of the conversion of methanol to olefins on silicoaluminophosphates SAPO-34 and SAPO-18 under continuous flow conditions

被引：65

作者：

Hunger, M ^{[1
]}

Seiler, M ^{[1
]}

Buchholz, A ^{[1
]}

机构：

[1] Univ Stuttgart, Inst Chem Technol, D-70550 Stuttgart, Germany

来源：

CATALYSIS LETTERS | 2001年 / 74卷 / 1-2期

基金：

欧盟地平线“2020”;

关键词：

methanol-to-olefin conversion; reaction mechanism; SAPO-34; SAPO-18; in situ MAS NMR spectroscopy; flow conditions;

D O I：

10.1023/A:1016687014695

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：

Applying in situ C-13 MAS NMR spectroscopy under continuous flow (CF) conditions and on-line gas chromatography, the conversion of methanol on silicoaluminophosphates SAPO-34 and SAPO-18 was studied. At reaction temperatures of 573 to 673 K, a strong increase of the yield of propylene and ethylene was observed by on-line gas chromatography. Simultaneously with the occurrence of in situ 13C CF MAS NMR signals at 126-135 ppm indicates the formation of a mixture of aliphatic and/or cyclic olefins and alkylated aromatics with carbon numbers of C-6-C-12. All these support the "hydrocarbon pool" mechanism for the formation of light olefins on the SAPO-34 and SAPO-18.

引用

页码：61 / 68

页数：8

共 42 条

[1] INSITU SOLID-STATE NMR-STUDIES OF THE CATALYTIC CONVERSION OF METHANOL ON THE MOLECULAR-SIEVE SAPO-34 [J].