CHA/AEI intergrowth materials as catalysts for the Methanol-to-Olefins process

CHA/AEI intergrowth materials as catalysts for the Methanol-to-Olefins process

Type	Journal Article
Author	Rachel L. Smith
Author	Stian Svelle
URL	http://www.sciencedirect.com/science/article/pii/S0926860X15300454
Volume	505
Pages	1-7
Publication	Applied Catalysis A: General
Date	September 25, 2015
Abstract	Researchers fabricated a series of SAPO-34/SAPO-18 intergrowth materials with a range of silicon content from 0.5 to 7.0%, where low levels of silicon resulted in SAPO-18 and higher levels resulted in CHA/AEI intergrowths. They tested these materials for their performance in the Methanol-to-Olefins reaction. The acidity of the catalysts was related to their silicon content, where a higher level of silicon produced a greater acid site density. The catalytic activity increased with increasing acid site density. This led to a higher level of heavy hydrocarbons in the catalysts at the end of the reaction in the materials with higher silicon content. The selectivity as a function of overall time on stream was similar for all catalysts, but at a given level of conversion, the C2/C3 ratio was lower for the materials with higher