Catalyst for producing unsaturated aldehyde and/or unsaturated carboxylic acid, method for producing the catalyst, and method for producing unsaturated aldehyde and/or unsaturated carboxylic acid using the catalyst
An object of the invention is to provide a novel catalyst having high mechanical strength and capable of obtaining an unsaturated aldehyde or an unsaturated carboxylic acid in a high yield and a method for producing the same, and a method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid using the catalyst. By containing silane-treated glass fibers in a catalytic active component composed of molybdenum and bismuth as essential components, high mechanical strength is revealed, and it is possible to obtain an unsaturated aldehyde or an unsaturated carboxylic acid in a high yield.
1. A catalyst for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid, comprising:
a compound containing a catalytic active component having the following formula (1); and
silane-treated glass fibers:
Mo a Bi b Ni c Co d Fe f X g Y h O x (1)
wherein Mo, Bi, Ni, Co and Fe represent molybdenum, bismuth, nickel, cobalt and iron, respectively; X means one or more elements selected from the group consisting of tungsten, antimony, tin, zinc, chromium, manganese, magnesium, silica, aluminum, cerium and titanium; Y means one or more elements selected from the group consisting of potassium, rubidium, thallium and cesium; a, b, c, d, f, g, h and x represent atomic numbers of molybdenum, bismuth, nickel, cobalt, iron, X, Y and oxygen, respectively; a=12; b=0.1 to 7; c+d=0.5 to 20; f=0.5 to 8; g=0 to 2; h=0.005 to 2; and x is a value determined by oxidation states of the respective elements.
2. The catalyst according to claim 1 ,
wherein the content of the silane-treated glass fibers is in a range of 0.1% by mass to 30% by mass relative to the catalytic active component.
3. The catalyst according to claim 1 , which is prepared by physically mixing the compound containing the catalytic active component and the silane-treated glass fibers and supporting the mixture on an inert carrier.
4. The catalyst according to claim 1 ,
wherein said catalyst has an average catalyst particle diameter of 5.0 mm or more after calcination at a temperature of 510° C. or higher.
5. The catalyst according to claim 1 ,
wherein said catalyst has an average catalyst particle diameter of 6.0 mm or more after calcination at a temperature of 540° C. or higher.
6. A method for producing the catalyst for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid according to claim 1 , comprising:
physically mixing the compound containing the catalytic active component having the formula (1) and the silane-treated glass fibers; and
supporting the mixture on an inert carrier.
7. A method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid by subjecting propylene, or isobutylene and/or tertiary butyl alcohol, to a gas-phase catalytic oxidation with molecular oxygen or a molecular oxygen-containing gas in the presence of a catalyst according to claim 1 .