化学
钼酸盐
催化作用
拉曼光谱
无机化学
钼
光谱学
有机化学
量子力学
光学
物理
作者
J. H. P. Wilson,Charles G. Hill,James A. Dumesic
出处
期刊:Journal of molecular catalysis
[Elsevier]
日期:1990-09-01
卷期号:61 (3): 333-352
被引量:19
标识
DOI:10.1016/0304-5102(90)80007-6
摘要
Abstract Raman spectra of both supported and unsupported Fe/Mo/O catalysts of the type used for the partial oxidation of methanol to formaldehyde were obtained while this reaction was proceeding over the catalyst surface. No changes in band locations or relative peak intensities associated with these mixed metal oxides were detected in the presence of reactant and product species. Moreover, no spectral features which could be attributed to adsorbed species could be detected under reaction conditions. Band intensities in the Raman spectra were related to the extent to which the catalysts were reduced; fully oxidized catalysts were stronger Raman scatterers than partially reduced catalysts. Although differences in color were noted between fresh and used catalysts, the Raman and Mossbauer spectra of these catalysts were identical. Calcination of used catalysts in an oxygen environment at 500 °C was sufficient to restore partially reduced catalysts to their original fully oxidized states.
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