Monsanto Company

Emerson H Lee

Samuel J Tremont

Robert A Keppel

George D Davis

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 m.sup.2 /g, and a pore diameter such that at least 10 percent of the pores are less than 55 .ANG., 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 T.sub.m for a time sufficient to cause infusion and reaction between the bismuth oxide and the alumina, wherein T.sub.m is the melting point of .degree.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.

Attrition resistant bismuth-containing metal/oxygen compositions

Attrition resistant 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 m.sup.2 /g, and a pore diameter such that at least 10 percent of the pores are less than 55 .ANG., and at least one metal oxide, or compound convertible by heat to such metal oxide, having a maximum mean particle size of about 100 .mu.m, with the proviso that the alumina/metal oxide mean particle size ratio is at least 2, which metal oxide is susceptible of undergoing infusion and reaction with the alumina upon being subjected to temperatures of at least 0.4 T.sub.m for a time sufficient to cause infusion and reaction between the metal oxide and the alumina, wherein T.sub.m is the melting point in .degree.K. of the alumina, are useful in a wide variety of metal oxide-catalyzed reactions. The compositions are especially useful in reactions which involve reaction conditions of high stress, for example, vapor phase oxidations under fluidized bed conditions.

Attrition resistant metal/oxygen compositions

Attrition resistant bismuth-containing metal/oxygen compositions comprising the infusion and reaction product of alumina and at least one bismuth oxide, or compound convertible by heat to such bismuth oxide, which bismuth oxide is susceptible of undergoing infusion and reaction with the alumina, are useful in metal oxide-catalyzed reactions. The compositions are especially useful in reactions which involve reaction conditions of high stress, for example, vapor phase oxidations under fluidized bed conditions.

Attrition resistant bismuth-containing metal/oxygen compositions and a

Attrition resistant metal/oxygen compositions comprising the infusion and reaction product of alumina and at least one metal oxide, or compound convertible by heat to such metal oxide, which metal oxide is susceptible of undergoing infusion and reaction with the alumina, are useful in a wide variety of metal oxide-catalyzed reactions. The compositions are especially useful in reactions which involve reaction conditions of high stress, for example, vapor phase oxidations under fluidized bed conditions.

Attrition resistant metal/oxygen compositions and a process for their

A process for the regeneration of a spent molybdenum-containing ammoxidation catalyst which comprises heating the catalyst at atmospheric pressure or higher and at 400.degree. C or higher for at least 1 hour in an atmosphere comprising 20-45% by volume of steam, the balance being air or a gas inert to the catalyst under the above conditions.

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Creve Coeur, MO, United States of America

Emerson H Lee