Ion-exchanged ZSM-5 Zeolites As Catalysts for Toluene Disproportionation Reaction

Content Provider	Semantic Scholar
Author	Kareem, M. A. Abdal Chand, Shri Mishra, Indra Mani
Copyright Year	2000
Abstract	Production of benzene and p-xylene by gi sproportionati on of toluene is carri ed out using ion-exchanged HZSM-5 cataly sts in a downtl ow continuous fixed bed reac tor at I atmos. The ion-exchange is done by replacing H+ ions of th e ZSM5 with Ni , Cr, Mg, Bi an d Zn . The results indi cate an in creased to lu ene co nversion as well as per cent p-xylene in the xylenes mixture much hi gher th an its eq uilibrium va lu e. The per cen t p-xylene yield defi ned as mole p-xylene obtained per mole toluene fed, which takes into accou nt both th e conversion as well as p-xylene selectivity is fou nd to be hi ghest on Ni exchanged catalyst. Magnesium and chromium exchanged catalys ts giv e much lower yield s. At 55 0"C, Ni exchanged catalyst gives toluene conversion of 28.5 per cent and the p-xylene selectivity of 53 per cent. The re ason for the poor performance of Cr may be attribut ed to its better oxidising property, which mi ght have oxidised th e coke particles formed on the surface of the catalyst which were responsible for th e pore mouth size reduct ion to suit the molecul ar size of p-isomer only.
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Alternate Webpage(s)	http://nopr.niscair.res.in/bitstream/123456789/26598/1/JSIR%2059(7)%20591-595.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article