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Selective synthesis of para–para′-dimethyldiphenylmethane over H-beta zeolite by Dingfeng Jin; Zhaoyin Hou; Liwei Zhang; Xiaoming Zheng is a Materials Science article available to read on EtoBox.

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Selective synthesis of para-para 0 -dimethyldiphenylmethane ( para-para 0 -DMDPM) from the condensation between toluene and formaldehyde was investigated over H-X, H-Y, H-ZSM-5, H-mordenite and MCM-41. Characterizations (NH 3 -TPD-MS and pore structure) disclosed that the catalytic activity of various zeolites depends mainly on its strong acid site and accessibility of the internal pores. H-beta zeolite, with a unique pore sized in 0.66 nm and higher proportion of stronger acid site, exhibited the highest activity and stereo-selectivity (86.5%). Small sized H-beta zeolite was more active due to the enhanced accessibility of its acid site, and this kind of zeolite remained a higher stereo-selectivity (>80%) even at higher temperature, longer reaction time and recycle usage. The best yield of para-para 0 -DMDPM reached 71.1% at 1408C over H-beta zeolite and it could be used in recycle without loss of its structure, activity and stereo-selectivity.

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Author

Dingfeng Jin; Zhaoyin Hou; Liwei Zhang; Xiaoming Zheng

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)