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Effect of Oxide Coating on Performance of Copper-Zinc Oxide-Based Catalyst for Methanol Synthesis via Hydrogenation of Carbon Dioxide

by Tetsuo Umegaki 1,*, Yoshiyuki Kojima 1,† and Kohji Omata 2,†
1
Department of Materials & Applied Chemistry, College of Science & Engineering, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-Ku, Tokyo 101-8308, Japan
2
Department of Materials Science, Interdisciplinary Faculty of Science and Engineering, Shimane University, 1060, Nishikawatsu-Chou, Matsue, Shimane 690-8504, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Alfons Baiker
Materials 2015, 8(11), 7738-7744; https://doi.org/10.3390/ma8115414
Received: 3 September 2015 / Revised: 4 November 2015 / Accepted: 9 November 2015 / Published: 16 November 2015
The effect of oxide coating on the activity of a copper-zinc oxide–based catalyst for methanol synthesis via the hydrogenation of carbon dioxide was investigated. A commercial catalyst was coated with various oxides by a sol-gel method. The influence of the types of promoters used in the sol-gel reaction was investigated. Temperature-programmed reduction-thermogravimetric analysis revealed that the reduction peak assigned to the copper species in the oxide-coated catalysts prepared using ammonia shifts to lower temperatures than that of the pristine catalyst; in contrast, the reduction peak shifts to higher temperatures for the catalysts prepared using L(+)-arginine. These observations indicated that the copper species were weakly bonded with the oxide and were easily reduced by using ammonia. The catalysts prepared using ammonia show higher CO2 conversion than the catalysts prepared using L(+)-arginine. Among the catalysts prepared using ammonia, the silica-coated catalyst displayed a high activity at high temperatures, while the zirconia-coated catalyst and titania-coated catalyst had high activity at low temperatures. At high temperature the conversion over the silica-coated catalyst does not significantly change with reaction temperature, while the conversion over the zirconia-coated catalyst and titania-coated catalyst decreases with reaction time. From the results of FTIR, the durability depends on hydrophilicity of the oxides. View Full-Text
Keywords: oxide coating; copper-zinc oxide based catalyst; methanol synthesis; hydrogenation of carbon dioxide; hydrophilicity of oxides oxide coating; copper-zinc oxide based catalyst; methanol synthesis; hydrogenation of carbon dioxide; hydrophilicity of oxides
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Umegaki, T.; Kojima, Y.; Omata, K. Effect of Oxide Coating on Performance of Copper-Zinc Oxide-Based Catalyst for Methanol Synthesis via Hydrogenation of Carbon Dioxide. Materials 2015, 8, 7738-7744.

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