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Advances in Materials Science and Engineering
Volume 2012, Article ID 293485, 7 pages
http://dx.doi.org/10.1155/2012/293485
Research Article

Production of Olefins and Propylene from Ethanol by Zr-Modified H-ZSM-5 Zeolite Catalysts

BTL Catalyst Group, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Ibaraki, Tsukuba 305-8565, Japan

Received 18 August 2011; Accepted 5 October 2011

Academic Editor: Wen-Hua Sun

Copyright © 2012 Megumu Inaba et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ethanol conversion to C3+ olefins, especially propylene, using Zr-modified H-ZSM-5 catalysts was investigated. Zr-modification to H-ZSM-5 zeolite could improve the initial yield of C3+ olefins and propylene and could reduce the initial yield of ethylene. In general, catalysts exhibiting the higher initial yield of propylene showed the steeper decrease in propylene yield as the reaction proceeded. However, Zr-modification to H-ZSM-5 could depress the decrease in propylene yield for aqueous ethanol. As cause of catalytic deactivation, carbon deposition on catalyst and framework collapse of zeolite support can be considered. The addition of water to Zr-modified H-ZSM-5 catalyst could depress carbon deposition in some degree, and, as a result, the decrease in propylene yield could be depressed.