Article ID Journal Published Year Pages File Type
62864 Journal of Catalysis 2007 9 Pages PDF
Abstract

Enhanced catalytic performance for C4 olefin cracking to propene and ethene was observed on phosphorus-modified HZSM-5 treated in steam at 1073 K. Combining the results of 31P and 27Al MAS NMR, D2/OH exchange, NH3-TPD, and catalytic performance of the catalysts, it seems reasonable to conclude that new and hydrothermally stable acid sites are formed during the steam treatment through the interaction of phosphorus species with silanol nests exposed on the zeolite due to dealumination. It is tentatively suggested that the incorporated phosphorous species stabilized by some nonframework aluminum species are responsible for both the enhanced acid stability and the significantly improved catalytic performance for the cracking of C4 olefin.

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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