Abstract: A titanium-containing silicon oxide catalyst satisfying all of the following conditions (1) to (4): (1): an average pore size of 10 Å or more, (2): a pore size of 90% or more of the total pore volume of 5 to 200 Å, (3): a specific pore volume of 0.2 cm3/g or more, and (4): a quarternary ammonium ion represented by the following general formula (I) is used as a template and then said template is removed by solvent extraction operation; [NR1R2R3R4]+  (I) wherein, R1 represents a linear or branched hydrocarbon chain having 2 to 36 carbon atoms, and R2 to R4 represent an alkyl group having 1 to 6 carbon atoms, a method for producing said catalyst, and a method for producing propylene oxide by reacting propylene with a hydroperoxide, except for ethylbenzene hydroperoxide, in the presence of said catalyst.

Abstract: A method for producing propylene oxide by reacting propylene with ethylbenzene hydroperoxide, wherein the reaction is conducted in the presence of a catalyst comprising a titanium-containing silicon oxide and satisfying all of the following conditions (1) to (6): (1) there is at least one peak showing a interplanar spacing (d) larger than 18 Å in X-ray diffraction; (2) an average pore size is 10 Å or more; (3) a pore size of 90% or more of the total pore volume is 5 to 200 Å; (4) a specific pore volume is 0.2 cm3/g or more; (5) a quaternary ammonium ion represented by the following general formula (I) is used as a template and then said template is removed by calcination operation: [NR1R2R3R4]+  (I) wherein R1 represents a linear or branched hydrocarbon chain having 2 to 36 carbon atoms, and R2 to R4 represent an alkyl group having 1 to 6 carbon atoms; and (6) The catalyst has been subjected to silylation treatment.

Abstract: A titanium-containing solid catalyst used for producing an oxirane compound by reacting an olefin type compound with an organic hydroperoxide, wherein the catalyst is obtainable by at least one method selected from the following (1) to (3): (1) a titanium compound is supported on silica having an average pore diameter (D) measured by a mercury pressing method of 5 nm or more and having pore distribution in which at least 60% of pore volume is composed of pores having a pore diameter within the range of D±0.3 D (nm), and is calcined (2) silica is impregnated in water, then dried, and a titanium compound is supported on the silica, then calcined, (3) silica is impregnated in a titanium-containing impregnation solution satisfying the following [formula-1], and is calcined A/B≦0.2 [formula-1] A: mol number of metal titanium in the impregnation solution B: mol number of a silanol group existing in silica.

Abstract: A method for producing propylene oxide by reacting a hydroperoxide with propylene by a fixed bed flow reaction in the presence of a titanium-containing solid catalyst, wherein said catalyst is diluted with a diluent comprising a solid inorganic compound which is inactive to the reaction and has a heat conductivity at 400 K of about 10 Wm.sup.-1 K.sup.-1 or more.

Abstract: A process for producing propylene oxide by reacting propylene with ethylbenzene hydroperoxide in the presence of a titanium-containing silicon oxide catalyst satisfying all of the following conditions (1) to (4):(1): an average pore size of 10 .ANG. or more,(2): a pore size of 90% or more of the total pore volume of 5 to 200 .ANG.,(3): a specific pore volume of 0.2 cm.sup.3 /g or more, and(4): a quarternary ammonium ion represented by the following general formula (I) is used as a template and then said template is removed by solvent extraction operation;[NR.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sup.+ (I)wherein, R.sup.1 represents a linear or branched hydrocarbon chain having 2 to 36 carbon atoms, and R.sup.2 to R.sup.4 represent an alkyl group having 1 to 6 carbon atoms.

Abstract: A process for producing propylene oxide which comprises reacting a raw material solution which is a solution of ethylbenzene hydroperoxide in ethylbenzene obtained by liquid phase autoxidation of ethylbenzene with propylene in the presence of a Ti-containing solid catalyst to give propylene oxide, said raw material solution being a solution prepared by washing a solution of ethylbenzene hydroperoxide in ethylbenzene obtained by liquid phase autoxidation of ethylbenzene with an aqueous alkali solution to bring a lactic acid concentration to 5 ppm by weight or less.