| 摘要 |
Attrition resistant bismuth-containing metal/oxygen compositions comprising the infusion and reaction product of an alumina existing in a crystal form selected from the group consisting of gamma , delta , eta , and chi crystal forms, and mixtures thereof or that can be transformed by heat to such crystal forms, and characterized by a mean particle size from about 10 mu m to about 200 mu m, a fractional porosity of at least 0.2, a surface area of at least 150 m2/g, and a pore diameter such that at least 10 percent of the pores are less than 55 ANGSTROM , and at least one bismuth oxide, or compound convertible by heat to such bismuth oxide, having a maximum mean particle size of about 100 mu m, with the proviso that the alumina/bismuth oxide mean particle size ratio is at least 2, which bismuth oxide is susceptible of undergoing infusion and reaction with the alumina upon being subjected to temperatures of at least 0.4 Tm for a time sufficient to cause infusion and reaction between the bismuth oxide and the alumina, wherein Tm is the melting point of DEG K. of the alumina, are useful in metal oxide-catalyzed reactions which involve reaction conditions of high stress, for example, vapor phase oxidations under fluidized bed conditions. The compositions are especially useful for the dehydrocoupling of toluene to yield toluene dehydrocoupled products in high yields and selectivities.
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