Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5

The present work reports an improved chemical vapour deposition (CVD) technique using low temperature, tetraethoxysilane (TEOS) and repeated CVD-calcination cycles. This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characterisation tools and a model reaction which involves molecules which are critical in size relative to the size of the ZSM-5 channels, the transformation of 1,2,4-trimethylbenzene (1,2,4-TMB) was investigated with respect to the reaction network, the role of the micropore space and the response to CVD treatments and Silicalite I coating. A generalised interpretation of the effect of modifications of the external surface activity and the pore mouth size on activity and shape selectivity of zeolites is proposed.

Grantor dc:publisher.institution

Department of Chemical Engineering

Year dc:date.issued

1998

Author dc:creator

• Röger, Hans Peter

Advisors dc:contributor.advisor

• Möller, Klaus
• O'Connor, Cyril

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/11427/19813

OAI identifier oai:identifier

oai:open.uct.ac.za:11427/19813