Patent ID: 7999125

Claim:
A method for producing propylene oxide, which comprises: reacting propylene, oxygen, and hydrogen in the presence of a noble metal catalyst and a titanosilicate catalyst in a liquid phase containing a polycyclic aromatic compound, which is unsubstituted or substituted with at least one substituent selected from Group B below, wherein the polycyclic aromatic compound is composed of 2 to 4 identical or different ring compounds selected from Group A below and the ring compounds are fused, directly bonded, or bonded by a linkage group selected from the group consisting of an oxygen atom, carbon chain, and a group composed of oxygen atom(s) and a carbon chain, provided that said polycyclic aromatic compound is not a polycyclic aromatic compound having hydroxy groups or oxo groups at para or ortho positions; wherein Group A consists of benzene, cyclopentadiene, cycloheptatriene, furane, pyrane, cyclopentene, cyclopentane, cyclohexane, cyclohexene, cyclohexadiene, cyclohcptanc, cycloheptene, and cycloheptadiene; and wherein Group B consists of halogen atom, alkyl group, alkenyl group, alkoxy group, hydroxyalkyl group, acyl group, oxo group, hydroxy group, and cyano group.