Ube Industries, Inc.

Produits Chimiques Ugine Kuhlmann

Kyoji Ohdan

Sumio Umemura

Tokuo Matsuzaki

Mikio Hidaka

Fumihiko Sakai

Yasuo Bando

Kenichi Suzuki

Yasuo Nakamura

Taizo Uda

Harumi Ikezawa

Toshihiko Hogami

Masao Tsuruoka

Toshio Kurafuji

Terumi Hisayuki

Hiroyuki Asada

Masataka Fuginaga

Ryoji Sugise

Masataka Fujinaga

Fumio Adachi

Kazuo Hashimoto

Iwao Okamoto

Tsuruoka, Masao

Toshitaka Fujii

Masataka Fuzinaga

Atsushi Kajima

Hiroshi Miura

Takayuki Kimura

Masao Sawazi

A porous lithium aluminate carrier for catalyst has a spinel structure which has a mean pore diameter in the range of 40 to 1,000 angstroms and a total pore volume in the range of 0.2 to 1.5 mL/g. The porous lithium aluminate carrier can be used for supporting a catalyst compound containing a platinum group metal. The catalyst on the carrier can be favorably employed for promoting catalytic reaction of a nitrite ester and carbon monoxide to prepare a carbonate diester such as dimethyl carbonate.

Porous lithium aluminate carrier of spinel structure for catalyst

An electromagnetic effect material comprising xA-yB-zC-wD-.alpha.0 series oxide ceramics, in which A and B represent one or more of element selected from the combination of elements represented by the general formula ABO.sub.3 and capable of forming a perovskite structure material exhibiting a ferromagnetic or antiferromagnetic property, C and D represent one or more of elements selected from the combination of elements represented by the general formula CDO.sub.3 and capable of forming a perovskite structure material exhibiting a ferroelectric, antiferroelectric or piezo-electric effect, with a proviso of excluding a case in which A and C are identical and B and D are identical to each other and a case in which A is Bi and B is Fe, x, y, z and w represent the ratio for the elements A, B, C and D, respectively, x+y+z+w=1, 0.01&lt;x&lt;0.95, 0.01&lt;y&lt; 0.95, 0.01&lt;z&lt;0.95, 0.01&lt;w&lt;0.95 and .alpha. represents a number of oxygen atoms capable of satisfying atomic valence of other elements, and having a temperature region in which the electromagnetic bonding coefficient is greater than 1.0.times.10.sup.-5 (emu cm/V g) within a temperature range from 250 to 700K.

Electromagnetic effect material

A hexagonal magnetoplumbite-type barium ferrite magnetic powder represented by the following formula

Barium ferrite magnetic powder and magnetic recording medium containing

A heteropolyacid type catalyst capable of producing methacrylic acid from methacrolein and molecular oxygen at an extremely high yield for a long time at a relatively low temperature for a short contacting time under a vapor phase is provided. This catalyst is prepared by:

Methacrylic acid production catalyst

An improved catalyst suitable for use in the production of an unsaturated carboxylic acid by the catalytic vapor phase oxidation of an unsaturated aldehyde is provided. In this catalyst, a heat-resistant inorganic substance, such as alumina, silica-alumina and silicon carbide, having a particle diameter of 3 through 10 mm, an apparent porosity of 35 through 60%, a water absorption of 20 through 50%, an average pore diameter of not less than 40 microns, a specific surface area of not more than 2 m.sup.2 /g and a bulk specific gravity of 1.5 through 2.0 is used for supporting a composition containing molybdenum, phosphorus, vanadium and the alkali metals. The use of the above-mentioned carrier results in the advantages that the unsaturated carboxylic acid, such as methacrylic acid, can be selectively produced from the unsaturated aldehyde at a high yield and that the mechanical strength of the catalyst is remarkably improved.

Catalyst for production of unsaturated carboxylic acid, preparation

A catalyst for the ammoxidation of propylene to prepare acrylonitrile with a high yield thereof comprising an oxide composition of the empirical formula (I)

Ammoxidation catalyst for the production of acrylonitrile from propylene

Acrylonitrile is produced from propylene in an excellent percent conversion of propylene, percent selectivity to acrylonitrile and percent yield of acrylonitrile, by bringing, at an elevated temperature, a reaction feed containing propylene, molecular oxygen and ammonia, each in gas phase, into contact with a catalyst consisting essentially of an oxide composition of the empirical formula:

Process for the catalytical preparation of acrylonitrile

Acrolein or methacrolein is produced in a high percent of yield by a catalytic oxidation of propylene or isobutylene in the presence of a catalyst of the empirical formula:

Process for the catalytic preparation of acrolein and methacrolein

An improved catalyst suitable for use in the production of acrylonitrile by the catalytic ammoxidation of propylene in a fluidized bed reactor is provided. This catalyst contains 40 to 60% by weight of silica, in terms of SiO.sub.2 , and 60 to 40% by weight of a composition having the formula:

Catalyst for producing acrylonitrile in a fluidized bed reactor

Methacrolein is catalytically oxidized into methacrylic acid in the vapor phase at a temperature of 200.degree. to 450.degree. C. The catalyst used is comprised of molybdenum, phosphorus, potassium and/or cesium, vanadium, silver and/or tellurium, and oxygen, and represented by the formula:

Catalytic oxidation of methacrolein

Methacrolein is produced in a high yield by catalytically oxidizing isobutylene at a temperature of from 250.degree. to 500.degree. C. by using a catalyst represented by the formula:

Process for producing methacrolein

Acrylonitrile can be catalytically produced with a high yield by bringing, at an elevated temperature, preferably of 300.degree. to 470.degree. C., a reaction feed containing propylene, ammonia and molecular oxygen into contact with a catalyst consisting of an oxide composition of the empirical formula: Mo.sub.a Co.sub.b Fe.sub.c X.sub.d O.sub.e wherein X denotes at least one atom of an element selected from phosphorus, arsenic, antimony and bismuth and wherein the ratio a:b:c:d:e is in a range of 12:4 to 9:1 to 5:0.01 to 0.07:39.5 to 52.7, said catalyst being prepared by providing an aqueous mixture containing molybdenum-, cobalt- and iron-containing compounds and a phosphorus-, arsenic-, antimony- or bismuth-containing compound, converting the aqueous mixture into a dried solid mixture and calcining the solid mixture at a temperature of at least 550.degree. C.

Method for the catalytical production of acrylonitrile

Unsaturated hydrocarbons having 4 to 6 carbon atoms are catalytically oxidized into maleic anhydride by using a catalyst, which consists essentially of oxides of (A) vanadium, (B) phosphorus, (C) titanium and (D) optionally at least one element selected from sodium, calcium, magnesium, iron, zirconium, boron, manganese, silver and molybdenum in the atomic ratios defined by the following formula

Catalytic oxidative process for producing maleic anhydride

Isobutylene is catalytically oxidized in the vapor phase with molecular oxygen to form methacrolein. The catalyst used consists essentially of metal oxides and is represented by the formula:

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Ube, Japan

Kyoji Ohdan