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- W2299993011 abstract "Data of stability tests (using x-ray photoelectron spectroscopy) of the rhodium carbonyl-Rh/sub 4/(CO)/sub 12/ catalyst supported by zinc oxide (ZNO) at 200 and 400/sup 0/C, and attempted reduction of ZnO by H/sub 2/ at 400/sup 0/C for 2 h, show no changes in the structures of these materials. However, reducing the catalyst at temperatures up to a maximum of 400/sup 0/C caused significant changes in both the supported Rh and the ZnO support. The relative intensity of the Rh 3d/sub 5/2/ peak compared with that of the Zn 3d peak decreased, and its peak shifted to lower binding energy. The buildup of intensity at higher kinetic energy is indicative of Zn/sup 2 +/ which has been reduced to Zn/sup 0/. Conclusion is that the Rh somehow stabilizes the Zn, possibly as an alloy. The results of treating the catalyst in a mixture of 400 torr of H/sub 2/ and 200 torr of CO at 200/sup 0/C for 3 h produced distinctly different results. Two Rh 3d/sub 5/2/ peaks were observed. The peak at 409 eV is similar to that of the untreated catalyst, indicating that most of the Rh must be highly dispersed, possibly as Rh carbonyls. The presence of more » the peak at 307.8 eV and the decrease of the Rh (3d)/Zn(3d) ratio also suggest that some agglomeration has occurred. As far as the support is concerned the Zn Auger peak did not change, indicating that the spectrum obtained was identical to that of the untreated material. These results seem to indicate that CO inhibits the absorption of H/sub 2/ on the Rh and that insufficient H/sub 2/ is present to reduce the ZnO. Even under mild conditions, metal support interactions should not be overlooked. 6 references, 2 figures, 1 table. « less" @default.
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- W2299993011 date "1983-11-01" @default.
- W2299993011 modified "2023-09-26" @default.
- W2299993011 title "Interaction of H/sub 2/ and CO with Rh/sub 4/(CO)/sub 12/ supported on ZnO" @default.
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