公开(公告)号：DE19843329A1

公开(公告)日：1999-04-08

申请号：DE19843329

申请日：1998-09-22

Applicant: BASF AG

Inventor： ROSOWSKI FRANK DR ,  HIBST HARTMUT PROF DR ,  SCHLOEGL ROBERT PROF DR ,  HEREIN DANIEL DR ,  BERNDT SILKE

IPC: B01J27/19 ,  B01J27/199 ,  C07C51/25 ,  C07C57/055

Abstract: Preparation of methacrylic acid by the catalyzed gas phase-oxidation of methacrolein comprises using a multi-metal oxide composition. Preparation of methacrylic acid by the catalyzed gas phase-oxidation of methacrolein comprises using a multi-metal oxide composition of formula M a-bM bM lM 12-cM cOd.e(MoP2Of).g(SbOh).i(SOk).l(H2O).(I) M = Na, K, Rb, Cs and/or NH4 ; M = Cu and/or Ag; M = P; M = Mo and/or W; M = Nb, V and/or Ta; a = 2.7-3.3; b and c = 0-2; d = 0-0.6; g = 0-3; d, f, h and k = numbers dependent on the valency of O; i = 0-0.1; l = 0-03. An Independent claim is included for the composition.