Agency of Industrial Science and Technology

Other

Shigemitsu Shin

Kunio Suzuki

Yoshimichi Kiyozumi

Haruo Takaya

Kiyoshi Ogawa

Hideo Okado

Kichinari Kawamura

Hideo Watanabe

Toshiya Kumagai

Susumu Mizuta

Fumikazu Ikazaki

Kunio Uchida

Wakichi Kondo

Yasuo Kono

Hiroshi Yokota

Tadasuke Hosoya

Michio Araki

Naoyuki Todo

Kenichiro Bando

Yasuo Takami

Yasuhiko Kohtoku

Yuzi Shimazaki

Kenji Kawaguchi

Kazumi Noguchi

Tadao Sekine

Michiko Yonemura

A superconductive material including a substrate and a superconductive layer of a double oxide of metals provided on the substrate is produced by a method which comprises the steps of:

Superconductive material and method of preparing same

A novel ceramic material affording a ceramic molded bodies having a high toughness and a high tensile strength is disclosed which comprises a smectite clay mineral having at least a portion of ion-exchangeable cations thereof ion-exchanged with bismuth ions. The ceramic material is prepared by treating a smectite clay mineral with an aqueous solution containing bismuth ions to ion-exchange at least a portion of ion-exchangeable cations thereof with bismuth ions.

Novel ceramic material, method for the preparation thereof and ceramic

The aluminoborosilicate containing an alkaline earth metal element, e.g. calcium, characterized by the chemical composition and the X-ray diffraction pattern is prepared by the hydrothermal reaction of a reaction mixture containing the source materials of boron and the alkaline earth in a similar procedure to that for the preparation of ZSM-5 type zeolites. Different from the conventional ZSM-5 zeolites into which calcium ions are introduced by ion exchange, the calcium ions in the inventive aluminoborosilicate are not replaceable by ion exchange with protons or alkali metal ions. The aluminoborosilicate of the invention after conversion into the hydrogen form is an excellent catalyst for the conversion of methyl alcohol or dimethyl ether into lower olefins such as ethylene and propylene in respect of the selectivity and durability of the catalytic activity with remarkably decreased deposition of carbonaceous materials.

Aluminoborosilicate containing alkaline earth metal, a method for the

A process for preparing lower olefin using a calcium phosphate modified zeolite type catalyst is disclosed which is capable of reducing the decomposition of methanol into CO and CO.sub.2 and increasing the olefin selectivity. In the process, the reaction of methanol and/or dimethyl ether is carried out in the presence of an aluminosilicate zeolite-type catalyst which has a Ca-containing compound and a P-containing compound contained therein in predetermined amounts.

Process for preparing lower olefin using calcium phosphate modified

A lower alcohol, especially methanol, or dimethyl ether is subjected to pyrolysis conditions in the presence of a specific catalyst to obtain lower olefins. The catalyst is comprised of a smectite, such as a montmorillonite clay, having superimposed aluminosilicate layers and zirconium oxide intercalated between the structural, aluminosilicate layers.

Production of olefins from a lower alcohol or dimethyl ether

The invention provides a novel highly heat-resistant solid catalyst for the ethanation of hydrogen and carbon monoxide into methane. Different from conventional nickel catalysts, the inventive catalyst comprises a binary active ingredient composed of an alloy of nickel and molybdenum and a molybdenum carbide supported on a porous catalyst carrier. The catalyst is prepared by heating a catalyst intermediate comprising the oxides of nickel and molybdenum supported on the carrier in a gaseous mixture of hydrogen and carbon monoxide at 500.degree.-700.degree. C., preferably, following a step of hydrogen reduction at 400.degree.-900.degree. C. The most preferable catalyst carrier is a mixture or a composite oxide compound composed of magnesium and aluminum oxides. The methanation reaction can be carried out with the inventive catalyst at a much higher temperature, e.g. 650.degree. C., than with conventional catalysts so that the heat recovery from the gaseous product is greatly facilitated contributing to the energy economy.

Catalyst for methanation and method for the preparation thereof

Growing community of inventors

Yatabe, Japan

Shigemitsu Shin