Acidity, surface species, and mechanism of methanol transformation into olefins on a SAPO-34

被引：0
|
作者：
del Campo, AES [1 ]
Gayubo, AG [1 ]
Aguayo, AT [1 ]
Tarrio, A [1 ]
Bilbao, J [1 ]
机构：
[1] Univ Basque Country, Dept Ingn Quim, E-48080 Bilbao, Spain
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 1998年 / 37卷 / 06期
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中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The nature of the active sites and the distribution of acidity strength of a SAPO-34 silicoaluminophosphate has been studied by FTIR spectrophotometry and by combined calorimetry-gas chromatography of ammonia desorption. On the basis of the in situ FTIR analysis of the surface species generated in the transformation of methanol into olefins and of the evidence of the existence of oxonium ions as intermediates, a mechanism has been proposed for the reaction, in which the oxonium ions are successively methylized by means of propagation reactions in the solid phase and ethyloxonium, propyloxonium, and so forth, are formed. This mechanism is mainly conditioned by shape selectivity.
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页码：2336 / 2340
页数：5
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