Nippon Shokubai Co., Ltd.

Masahide Shima

Hitoshi Takada

Tsukasa Takahashi

Tadashi Sento

Hiroyuki Hirota

Tatsuya Kawabata

Takaaki Hashimoto

Masatsugu Mikawa

Masafumi Sugio

PROBLEM There is provided a catalyst for producing ethylene oxide which is superior in catalytic selectivity and catalytic life (durability). SOLUTION There is provided a catalyst for producing ethylene oxide having a catalyst component supported on a carrier, wherein the carrier has specific surface area of 0.5 to 1.3 m/g, Si content (SiOequivalent) of 0.1 to 5.0% by mass and Na content (NaO equivalent) of 0.05 to 1.0% by mass, and the catalyst component is silver (Ag), cesium (Cs), rhenium (Re) and tungsten (W) or molybdenum (Mo).

Catalyst for producing ethylene oxide and method for producing ethylene oxide

There is provided a novel process for producing acrylic acid by which acrylic acid can be obtained from a raw material independent of petroleum. The process for producing acrylic acid according to the present invention comprises the steps of: applying a dehydration reaction to glycerol as a raw material in a gas phase; and then applying a gas phase oxidation reaction to a gaseous reaction product formed by the dehydration reaction.

Method for producing acrylic acid

A catalyst for producing alkylene oxide including fine metal silver particles dispersed and supported on a carrier, wherein not less than 90% of the fine metal silver particles have silver particle diameters of 2 to 100 nm, is disclosed. The catalyst can be produced by impregnating a carrier with a liquid containing a silver compound or a silver ion; drying the carrier; and then irradiating the carrier with microwave to form fine metal silver particles in dispersed state on the carrier. This catalyst is used for producing olefin oxide by contact gas-phase oxidation of olefin by a molecular-oxygen-containing gas.

Catalyst for producing alkylene oxide, method for producing the same, and method for producing alkylene oxide using said catalyst

A catalyst for partial oxidation of olefin, which comprises silver or silver oxide and an alkali metal or a compound thereof supported on an &#x3b1;-alumina carrier containing silicon or a compound thereof, wherein the silicon or the compound thereof exists at a position substantially identical to that of a particle of the alkali metal or the compound thereof, a preparation method thereof, and a process for preparing olefin oxide which comprises subjecting olefin to vapor-phase oxidation with a molecular oxygen-containing gas in the presence of the catalyst.

Catalyst for partial oxidation of olefin, preparation method thereof, and process for preparing alkylene oxide

A ceramic article is disclosed which contains aluminum, silicon, and titanium in a total amount of at least 99% by weight as reduced to the oxides (AlO+SiO+TiO) and assumes an acidic color in methyl red, an indicator of at least pKa+4.8. It can be used as a carried for a catalyst. This ceramic article is obtained by mixing an aluminum compound, a silicon compound, and a titanium compound and calcining the resultant mixture at a temperature in the range of 1,000&#xb0;-2,000&#xb0; C. A catalyst for preparing ethylene oxide is obtained by depositing silver and a reaction promoter on the ceramic carrier and ethylene oxide is obtained by oxidizing ethylene with a molecular oxygen-containing gas in the presence of the catalyst in vapor phase.

Ceramic article, carrier for catalyst, methods for production thereof, catalyst for producing ethylene oxide using the carrier, and method for producing ethylene oxide

A carrier which permits preparation of a catalyst possessed of excellent catalytic performance and used for the production of ethylene oxide, a catalyst obtained by using this carrier, endowed with excellent catalytic performance, and used for the production of ethylene oxide, and a method for the production of ethylene oxide by the use of the catalyst are provided. The carrier is obtained by mixing &agr;-alumina having an alkali metal content in the range of 1-70 m.mols/kg (&agr;-alumina) with an aluminum compound, a silicon compound, and an alkali metal compound and calcining the produced mixture. The carrier which has an aluminum content as reduced to Al in the range of 0-3 mols/kg of carrier, a silicon compound content as reduced to Si in the range of 0.01-2 mols/kg of carrier, and an alkali metal content as reduced to alkali metal in the range of 0.01-2 mols/kg of carrier is used for the deposition of a catalyst for use in the production of ethylene oxide.

Carrier for catalyst for use in production of ethylene oxide, catalyst for use in production of ethylene oxide, and method for production of ethylene oxide

A catalyst for gas phase oxidation of ethylene which excels in selectivity and life performance, a method for the production of the catalyst and a method for the production of ethylene oxide by the use of the catalyst are disclosed. Specifically, the catalyst for the production of ethylene oxide has silver deposited on a carrier containing 90.0-98.9 mass % of &agr;-alumina, 0.01-1 mass % of a compound of at least one metal element selected from the group consisting of potassium and iron (calculated as oxide), 0.1-5 mass % of a silicon compound (calculated as oxide), and 1-5 mass % of zirconium compound (calculated as oxide) in inner portion thereof, the method for the production of this catalyst, and the method for the production of ethylene oxide by the use of this catalyst.

Catalyst for production of ethylene oxide, method for production thereof, and method for production of ethylene oxide by the use of the catalyst

A catalyst for the production of ethylene oxide is formed by causing a carrier having &agr;-alumina as a main component thereof to incorporate therein silica and a metal or a compound of at least one element selected from the elements of the groups Ib and IIb in the periodic table of the elements such as, for example, silver oxide and depositing silver on the carrier. The carrier is obtained by mixing at least &agr;-alumina, a silicon compound, an organic binder, and a compound of at least one element selected from the elements of the groups Ib and IIb in the periodical table of the elements and then calcining the resultant mixture at a temperature in the range of 1,000&deg;-1,800&deg; C.

Silver catalyst for production of ethylene oxide, method for production thereof, and method for production of ethylene oxide

A catalyst for the production of ethylene oxide is formed by causing a carrier having .alpha.-alumina as a main component thereof to incorporate therein silica and a metal or a compound of at least one element selected from the elements of the groups Ib and IIb in the periodic table of the elements such as, for example, silver oxide and depositing silver on the carrier. The carrier is obtained by mixing at least .alpha.-alumina, a silicon compound, an organic binder, and a compound of at least one element selected from the elements of the groups Ib and IIb in the periodical table of the elements and then calcining the resultant mixture at a temperature in the range of 1,000.degree.-1,800.degree. C.

Silver catalyst for production of ethylene oxide, method for production

A silver catalyst excelling in catalytic performance and permitting production of ethylene oxide with a high selectivity for a long time, a method for the production of ethylene oxide by the use of the silver catalyst, and a method for ideal manufacture of the silver catalyst are disclosed. The silver catalyst is formed by depositing silver on a carrier having .alpha.-alumina as a main component and used for the production of ethylene oxide, which carrier of the silver catalyst has undergone the following treatment capable of yielding a wash exhibiting a resistivity index of not less than 10,000 .OMEGA..multidot.cm (25.degree. C.): (Method of treatment) In a conical beaker having an inner volume of 500 ml, 300 ml of the carrier is placed, dried therein at 120.degree. C. for two hours, and boiled in conjunction with (water absorption +220) ml of pure water added thereto under normal pressure at 90.degree. C. for 30 minutes, providing that the term 'water absorption' as used herein refers to what is expressed by the following formula (1):

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Kobe, Japan

Masahide Shima