| abstract |
The present invention provides a silica molded body which is less prone to dealumination of zeolite even in a high temperature water vapor atmosphere and is less susceptible to corrosion of stainless steel commonly used in industrial equipment, a process for producing the same, and a process for producing propylene using the silica formed product Purpose and problem. The method for producing a silica compact according to the present invention comprises the steps of preparing a raw material mixture containing silica and zeolite, obtaining a dried body by drying the raw material mixture, and calcining the dried body, Or phosphoric acid and / or phosphate solution is brought into contact with the zeolite and / or the dried body, or a combination thereof, the content of the phosphorus element in the silica-formed body is larger than the mass of the entire silica- To 0.01% by mass to 1.0% by mass with respect to the total mass of the catalyst. |