沸石负载Ni催化剂在甲烷干重整中的稳定性.docx

ava i l a b l e at HYPERLINK http://www/ ww w . scie nce d ir ect. ava i l a b l e at HYPERLINK http://www/ ww w . scie nce d ir ect.c o m journal hom e p a g e : www .else v ier . c o m / loc a t e / c hnjc Article Stabilities of zeolite‐supported Ni catalysts for dry reforming of methane Anis H. FAKEEHA, Wasim U. KHAN, Ahmed S. AL‐FATESH, Ahmed E. ABASAEED * Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia A R T I C L E I N F O A B S T R A C T Article history: Received 26 October 2012 Accepted 8 February 2013 Published 20 April 2013 Ni/γ‐Al2O3, Ni/Y‐zeolite, and Ni/H‐ZSM‐5 catalysts were prepared using the incipient wetness im‐ pregnation method. Their catalytic performance in dry reforming of methane was studied. The fresh and used catalysts and deposited carbon were characterized using H2 temperature‐programmed reduction, temperature‐programmed oxidation, N2 adsorption‐desorption, X‐ray diffraction, and thermogravimetric analysis. The H‐ZSM‐5‐supported Ni catalyst proved to be more stable than the other two catalysts, as it had the lowest carbon deposition. ? 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. Keywords: Carbon dioxide Dry reforming Methane Nickel catalyst H‐ZSM‐5 zeolite Carbon deposition 1. Introduction stable systems. These excellent properties, combined with a low potential for support–metal interactions and superior cok‐ ing resistance, make zeolites important catalyst supports in the CO2 reforming of CH4. Ni catalysts are used industrially for both steam reforming and dry reforming reactions because of their fast turnover rates, ready availability, and low costs [11]. A major problem encountered in Ni‐based catalysts is carbon deposition on the surface, which leads to deactivation and blockage of reactor tubes. Besides coke formation, sintering of metal par