Patent ID: 8481790
Filing Date: 2013-07-09
Classification: B01J,C07C

Abstract:
1. A method of preparing a catalyst used for producing unsaturated aldehyde by the oxidation of lower olefin at a high space velocity, said catalyst is a Mo—Bi—Fe—Co based composite metal oxide represented by a formula of wherein Mo is a molybdenum atom; Bi is a bismuth atom; Fe is an iron atom; Co is a cobalt atom; X is at least one atom selected from tungsten (W), antimony (Sb), arsenic (As), phosphorus (P), nickel (Ni), tin (Sn), and plumbum (Pb); Y is at least one atom selected from zinc (Zn), chromium (Cr), manganese (Mn), ruthenium (Ru), silver (Ag), palladium (Pd) and ruthenium (Ru); Z is at least one atom selected from sodium (Na), potassium (K), lithium (Li), rubidium (Rb), cesium (Cs), calcium (Ca), magnesium (Mg), strontium (Sr), and barium (Ba); and each of a, b, c, d, e, f and g represents the atomic ratio of each atom, with the proviso that when a=12, b=0.1˜7, c=0.5˜8, d+e=0.5˜20, f=0˜1, g=0˜2, and h is a number determined by the oxidation state of each atom; said catalyst is prepared by co-precipitation, i.e. the precursor compounds for the catalyst are co-precipitated to obtain a slurry at pH 1.5˜3.0, the slurry is rapidly dried, then silicon powder as a diluting thermal conductor is added and the mixture is molded and fired to produce the finished catalyst; alternatively, a diluting thermal conductor can be added into the slurry prior to the rapid drying, then the dried mixture is molded and fired to produce the finished catalyst.