Production of ring-shaped solid mixed oxide catalysts, useful for the gas phase oxidation of propene, isobutene or tert-butanol to acrolein or methacrolein, comprises thermal treatment to give a specific lateral compressive strength

摘要

A process for the production of ring-shaped solid mixed oxide catalysts with a length of 2-11 mm, an outer diameter of 2-11 mm and a wall thickness of 0.75-1.75 mm, comprises production of a fine-particulate mixture from sources of the elementary constituents of the active mass, followed by forming to shape and thermal treatment at elevated temperature to form catalysts having a lateral compressive strength of 12-23 N. A process for the production of ring-shaped solid catalysts (I) having optionally curved faces, whose active mass is of formula (1) or (2), and having a geometry, without reference to any optional curvature of the faces, with a length of 2-11 mm, an outer diameter of 2-11 mm and a wall thickness of 0.75-1.75 mm, comprises production of a fine-particulate mixture from sources of the elementary constituents of the active mass, optionally following addition of forming and/or reinforcing agents, followed by forming of ring-shaped solid catalyst precursor molded articles having optionally curved faces and thermal treatment at elevated temperature to form the catalysts (I) having a lateral compressive strength of 12-23 N. Mo12BiaFebX1cX2dX3eX4fOn (1) (Y1a'Y2b'Ox')p(Y3c'Y4d'Y5e'Y6f'Y7g'Y2h'Oy')q (2) X1 = Ni and/or Co; X2 = Th, an alkali metal or alkaline earth metal; X3 = Zn, P, Ar, B, Sb, Sn, Ce, Pb and/or W; X4 = Si, Al, Ti and/or Zr; a = 0.2-5; b = 0.01-5; c = 0-10; d = 0-2; e = 0-8; f = 0-10; n = a number dependent upon the valency and frequency of non-oxygen elements; Y1 = Bi or Bi and Te, Sb, Sn and/or Cu; Y2 = Mo or Mo and W; Y3 = alkali metal; Th and/or Sm; Y4 = alkaline earth metal, Ni, Co, Cu, Mn, Zn, Sn, Cd and/or Hg; Y5 = Fe or Fe and V, Cr and/or Ce'; Y6 = P, Ar, B and/or Sb; Y7 = rare earth metal, Ti, Zr, Nb, Ta, Rh, Ru, Re, Ag, Au, Al, Ga, In, Si, Ge, Pb, Th and/or U; a' = 0.01-8; b' = 0.1-30; c' = 0-4; d' = 0-20; e' = greater than 0-20; f' = 0-6; g' = 0-15; h' = 8-16; x', y' = numbers dependent upon the valency and frequency of non-oxygen elements; and p/q = 0.1-10. Independent claims are also included for: (1) a solid catalyst (I) having a specific surface area of 5-23 m2/g, total pore volume of 0.1-1 cm3/g and no greater than 5 vol.% of pores of less than 0.03 microns in diameter, no greater than 25 vol.% of pores having a diameter of 0.03-0.1 microns, at least 70 vol.% of pores having a diameter of 0.1-1 microns and no greater than 10 vol.% of pores having a diameter of 1-13 microns; (2) a process for the production of acrolein and/or methacrolein by heterogeneous partial gas phase oxidation of propene, iso-butene and/or tert.-butanol in the presence of the heterogeneous solid catalyst (I).