Synergism in methanol synthesis from carbon dioxide over gold catalysts supported on metal oxides

✍ Scribed by H. Sakurai; M. Haruta

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 306 KB
• Volume: 29
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00305-3

✦ Synopsis

Gold deposited on various oxides with high dispersion was found to be active for the hydrogenation of CO 2 at temperatures between 150 and 400°C. Product selectivities greatly depended on the nature of support oxide. Acidic oxides like TiO 2 gave higher CO 2 conversions but low methanol yields. Zinc oxide component was indispensable for selective methanol synthesis. Significantly, large particle size effect of gold was observed and smaller gold particles gave higher methanol productivity per exposed surface area of gold. This can be explained by an increase in the perimeter area of gold particles with a decrease in particle size. Methanol yield was greatly enhanced in a Au/ZnO-TiO 2 catalyst probably due to an increase in gold-zinc oxide interface.