FORMED PRODUCT BASED ON SILICON DIOXIDE, PRODUCTION AND USE THEREOF, SUPPORTED CATALYST FOR PRODUCTION OF VINYL ACETATE MONOMER, PRODUCTION AND USE OF THE SUPPORTED CATALYST

摘要

PROBLEM TO BE SOLVED: To minimize the pressure drop, give the small bulk density and a relatively large outer surface area and permit improved mass transfer and heat transfer by forming stays or spokes extending from the inner wall of the hollow cylinder toward the center for strengthening the inside or forming a plurality of passageways. SOLUTION: The molded body of a wheel shape has an outer diameter d1 of 1-25 mm, the ratio of height to the outer diameter d1 of 0.2-5, the wall thickness [(d1-d2)×0.5] of 0.05-0.5×d1, the thickness of the stay or spoke d3 of 0.05-0.3×d1 and the number of the stays or spokes or the passageways of at least 3. The molded body is formed by kneading the base of silicon dioxide produced by thermal decomposition, forming the silicon dioxide by means of a single or twine screw extruder and strand-pressing formed silicon dioxide into a hollow cylinder in a wheel shape. Then, the strand-pressed produce is cut in a desired thickness and they are heat-treated at 400-1,200 deg.C for 30 minutes-10 hours. The molded body is allowed to carry a catalytically active component such as Pd/alkali/Au system or the like to give the objective supported catalyst that attains the high space time yield and the high selectivity in the production of vinyl acetate.