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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Effects of palladium particle size in hydrogenation of carbon dioxide to methanol over Pd/ZnO catalysts

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Title
Effects of palladium particle size in hydrogenation of carbon dioxide to methanol over Pd/ZnO catalysts
Other Titles
Effects of palladium particle size in hydrogenation of carbon dioxide to methanol over Pd/ZnO catalysts
Author
Lee, DeogseongLee, Jun-YearbLee, Jae Sung
Keywords
pH measurement; precipitation; surface property; transmission electron microscopy; X ray diffraction
Issue Date
2004
Publisher
CARBON DIOXIDE UTILIZATION FOR GLOBAL SUSTAINABILITY
Citation
STUDIES IN SURFACE SCIENCE AND CATALYSIS, v.153, no., pp.169 - 172
Abstract
Pd/ZnO catalysts with various Pd particle sizes were prepared by water-in-oil microemulsion method and investigated as catalysts for CO 2 to methanol. The Pd particle size of the catalyst could be controlled by varying pH of microemulsions, regardless of Pd content. As pH varied from 1 to 7, the average Pd particle size increased from 2.1 to 10.1 nm. The distribution of metal particle sizes was considerably narrower compared with that of the catalysts obtained by the conventional precipitation method. The effects of Pd particle size were complicated by the formation of Pd-Zn alloy and coverage of Pd particles by ZnO, both of which were pronounced for small particles. Thus methanol selectivity increased with decreasing Pd particle size, showing a maximum at 3.4 nm, and then decreased for smaller particles. This selectivity pattern showed an excellent correspondence with the pattern of surface Pd fractions measured by EPMA.
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DOI
10.1016/S0167-2991(04)80240-4
ISSN
0167-2991
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ECHE_Journal Papers
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