PRODUCTION OF PROPYLENE OXIDE

摘要

PURPOSE: To produce the subject compound in high selectivity without being influenced with a raw material gas composition in oxidizing reaction or preparing conditions of a catalyst according to a new method for directly oxidizing propylene with oxygen and hydrogen in the presence of a titanosilicate catalyst supporting a noble metal at a specific temperature. CONSTITUTION: Propylene is directly oxidized with oxygen and hydrogen in the presence of a catalyst supporting a group VIII noble metal of the periodic table (preferably Pd or platinum) on a titanosilicate at 0-40 deg.C, preferably 10-35 deg.C. A titanosilicate is preferably a synthetic zeolitic substance of the formula nSiO2 . (1-n)TiO2 [(n) is 0.8-0.999] capable of manifesting an X-ray diffraction pattern of a pentasil type structure. The titanosilicate is preferably obtained by hydrolyzing a tetraalkyl orthosilicate and a tetraalkyl orthotitanate with an aqueous solution of a tetraalkylammonium hydroxide and then carrying out the hydrothermal synthesis. The catalyst is preferably prepared by supporting a noble metallic compound on the titanosilicate according to an impregnating method and then conducting the reducing treatment of the noble metallic compound.