A process for preparing a multimetal oxide material which contains the elements
Mo, V and Te and/or Sb and at least one of the elements Nb, Ti, W, Ta and Ce and
if desired promoters and has a specific X-ray diffraction pattern, in which process
the last process step comprises washing with acidic liquids. In addition, a multimetal
oxide material obtainable in such a way is used as a catalyst for heterogeneously
catalyzed gas-phase partial oxidations and/or ammoxidation of hydrocarbons.