Patent ID: 7473666
Filing Date: 2009-01-06
Classification: B01J,C07C,Y02P

Abstract:
1. A particulate porous ammoxidation catalyst for use in producing acrylonitrile or methacrylonitrile by reacting propylene, isobutene or tert-butyl alcohol with molecular oxygen and ammonia in a fluidized-bed reactor, said catalyst comprising a metal oxide and a silica carrier having supported thereon said metal oxide, wherein said silica carrier is present in an amount of from 20 to 80% by weight, based on the total weight of said metal oxide and said silica carrier and wherein said metal oxide is represented by the following formula (1): wherein: C is at least one element selected from the group consisting of nickel, cobalt, manganese, zinc, magnesium, calcium, strontium and barium; D is at least one element selected from the group consisting of chromium, tungsten, boron, aluminum, gallium, indium, phosphorus, antimony and tellurium; E is at least one element selected from the group consisting of rare earth elements; F is at least one element selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum; G is at least one element selected from the group consisting of sodium, potassium, rubidium and cesium; and a, b, c, d, e, f, g and n are, respectively, the atomic ratios of bismuth (Bi), iron (Fe), C, D, E, F, G and oxygen (O), relative to 12 atoms of molybdenum (Mo), said catalyst having a particle diameter distribution wherein the amount of catalyst particles having a particle diameter of from 5 to 200 μm is from 90 to 100% by weight, based on the weight of said catalyst, and said catalyst having a pore distribution wherein the cumulative pore volume of pores having a pore diameter of 80 Å or less is not more than 20%, based on the total pore volume of said catalyst, and the cumulative pore volume of pores having a pore diameter of 1,000 Å or more is not more than 20%, based on the total pore volume of said catalyst.