Characterizations and catalytic properties of Cr-MCM-41 prepared by direct hydrothermal synthesis and template-ion exchange
作者： Ye Wang , Yoshihiko Ohishi , Tetsuya Shishido , Qinghong Zhang , Wei Yang
DOI: 10.1016/S0021-9517(03)00278-1
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摘要: Abstract Cr-MCM-41 prepared by direct hydrothermal synthesis (DHT) and template-ion exchange (TIE) has been characterized X-ray diffraction (XRD), N2 adsorption (77 K), diffuse reflectance UV–vis, absorption (XANES EXAFS), UV-Raman spectroscopic measurements. It is suggested that monochromate species mainly exist on the DHT method while several types of chromate including both monochromates polychromates coexist TIE method. The two kinds samples exhibit similar catalytic property in dehydrogenation propane with carbon dioxide. selectivity to propylene higher than 90% presence dioxide enhances conversion. are reduced aggregated Cr(III) octahedral coordination during reactions. On other hand, formaldehyde partial oxidation methane oxygen remarkably over sample structure kept methane, high dispersion probably accounts for
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