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- W981091331 abstract "The catalytic properties of chromia have received considerable attention, probably more than those of any other catalysts except Group VIII metals, silica, and alumina. This chapter describes the unsupported chromia as a catalyst for relatively low temperature reactions under reducing conditions, and provides an outline of the wide variety of reactions catalyzed by chromia or supported chromia. A chromia gel activated only at 150° has no detectable catalytic activity for the hydrogenation of olefins at room temperatures nor does it chemisorb oxygen or carbon monoxide. Catalytic and adsorptive capacity develops upon pretreating the gel at higher temperatures. After heating to 400°, chromia rapidly chemisorbs oxygen and carbon monoxide at −78° and it leads to rapid hydrogenation of ethylene at −78°. The surface of chromia appears to be an ideal case for study at the present. By activation at increasing temperatures, one can vary the number of active sites from none to some maximum number. At a low density of sites, one can hope that the sites are well separated and non-interacting. One can compare chemisorption of various gases with specific catalytic activities at various levels of site densities and hope to gain information about site heterogeneity." @default.
- W981091331 created "2016-06-24" @default.
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- W981091331 date "1969-01-01" @default.
- W981091331 modified "2023-10-17" @default.
- W981091331 title "Chemisorptive and Catalytic Behavior of Chromia" @default.
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- W981091331 doi "https://doi.org/10.1016/s0360-0564(08)60268-0" @default.
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