Selectivities in methylcyclopentane and n-hexane conversion on some metal-loaded SAPO-11 catalysts
✍ Scribed by M. Hoffmeister; J.B. Butt
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 987 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0926-860X
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✦ Synopsis
The medium pore silicoaluminophosph molecular sieve SAPO-11 of mild acidity was loaded with platinum or palladium by ion exchange and wet impregnation and investigated as to activity and selectivity in methylcyclopentane (MCP) hydrogenolysis and n-hexane (nHEX) conversion at 1 atm and 673 K. For MCP high selectivities for benzene formation were observed, while for nHEX high selectivities for the formation of iso-hexane isomers were found. In addition an unusually high n-hexane selectivity in the ring opening reaction of MCP and the formation of benzene for a set of NaN,-treated Pd/ SAPO-11 and Pt/SAPO-11 catalysts were observed for both the MCP and nHEX reactions. The somewhat peculiar selectivity patterns in this class of molecular sieve catalysts are interpreted in terms of a series of reaction pathways incorporating both confinement effects and shape selectivity factors as being of importance in determination of the observed product distributions.