Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 3, Pages 1348-1362Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.10.117
Keywords
Steam reforming of methanol; Hydrogen; Alloy; Solid solution; CeO2; zrO(2)
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Funding
- Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program [PHD/0282/2552]
- National Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University
- National Research University Project of CHE and the Ratchadaphiseksomphot Endowment Fund [EN276B]
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We tested 3 wt% gold (Au) catalysts on CeO2 ZrO2 mixed oxides, prepared by co-precipitation (CP) and the sol-gel (SG) technique, for steam reforming of methanol (SRM). Uniform Ce1-xZrxO2 solid solution was dependent on the Zr/Ce ratio, where the incorporation of Zr4+ into the CO4+ lattice with a ratio of 0.25 resulted in smaller ceria crystallites and better reducibility, and was found to be efficient for SRM activity. The catalytic activity was suppressed when the ratio was >= 0.5, which led to the segregation of Zr from solid solution and sintering of Au nanoparticles. It was found that the CP technique produced better catalysts than SG in this case. For the bimetallic catalysts, the co-operation of Au-Cu supported on Ce0.75Zr0.25O2 (CP) exhibited superior activities with complete methanol conversion and low CO concentration at 350 degrees C. Furthermore, the size of the alloy particle was strongly dependent on the pH level during preparation. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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