Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9585419 | Journal of Electron Spectroscopy and Related Phenomena | 2005 | 4 Pages |
Abstract
Speciation of copper on ZrO2 during the catalytic hydrogenation of CO2 has been studied by in situ extended X-ray absorption fine structural (EXAFS) spectroscopy in the present work. The EXAFS data indicated that about 3.1 nearest oxygen atoms surrounded the Cu atoms with a CuO bond distance of 1.95Â Ã
in the calcined Cu/ZrO2 catalyst. Reduction of the catalyst in hydrogen at 573Â K led to a formation of CuCu (2.56Â Ã
) bonds with a coordination number (CN) of 5.6. Mainly CO and CH3OH were generated in the hydrogenation of CO2 catalyzed by the reduced Cu/ZrO2 catalyst at 673Â K. About 76% of the Cu(0) species was oxidized to Cu(I) (27%) and Cu(II) (49%) on ZrO2 during the catalytic hydrogenation process.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
S.-H. Liu, H. Paul Wang, H.-C. Wang, Y.W. Yang,