Acidity, Surface Species, and Mechanism of Methanol Transformation into Olefins on a SAPO-34
详细信息 查看全文
- 作者：Ana E. Sá ; nchez del Campo ; Ana G. Gayubo ; André ; s T. Aguayo ; Ana Tarrí ; o ; and Javier Bilbao
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1998
- 出版时间：June 1998
- 年：1998
- 卷：37
- 期：6
- 页码：2336 - 2340
- 全文大小：107K
- 年卷期：v.37,no.6(June 1998)
- ISSN：1520-5045
文摘
The nature of the active sites and the distribution ofacidity strength of a SAPO-34 silicoaluminophosphate has been studied by FTIR spectrophotometry and bycombined calorimetry-gas chromatography of ammonia desorption. On the basis of the insitu FTIR analysis of thesurface species generated in the transformation of methanol intoolefins and of the evidence ofthe existence of oxonium ions as intermediates, a mechanism has beenproposed for the reaction,in which the oxonium ions are successively methylized by means ofpropagation reactions inthe solid phase and ethyloxonium, propyloxonium, and so forth, areformed. This mechanismis mainly conditioned by shape selectivity.