Mitsui Minings & Melting Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Yuichi Senoo

Susumu Takahashi

Isamu Yashima

Naohiko Abe

Koichi Miyake

Hiromu Watanabe

Kazuya Kinoshita

Koji Taniguchi

Tatsuya Arai

Katsuhiko Hayashi

Akiko Sugioka

Takahiro Kogawa

Akihiro Kanno

Yousuke Shibata

Junki Tomita

Provided is a beta zeolite satisfying P>76.79Q−29.514 in a range in which Q is less than 0.4011 nm, wherein, P represents an AB value that is an intensity ratio of A to B, A represents a diffraction intensity of a main peak of the beta zeolite observed by X-ray diffraction measurement, B represents a diffraction intensity of the (116) plane of α-alumina obtained by X-ray diffraction measurement under the same conditions as those for the X-ray diffraction measurement on the beta zeolite, the α-alumina being the standard substance 674a distributed by the American National Institute of Standards and Technology, and Q represents a lattice interplanar spacing of the main peak of the beta zeolite observed by X-ray diffraction measurement. It is preferable that the formula (1) above is satisfied in a range in which Q is from 0.3940 to 0.4000 nm.

Beta-type zeolite and catalyst containing same

Provided is a method with which it is possible to easily produce an electrode catalyst having excellent catalytic performance such as kinetically controlled current density. The method involves: a dispersion liquid preparation step of preparing a dispersion liquid by mixing (i) at least one type of solvent selected from the group consisting of sulfoxide compounds and amide compounds, (ii) a catalyst carrier powder constituted by a metal oxide, (iii) a platinum compound, (iv) a transition metal compound, and (v) an aromatic compound including a carboxyl group; and a loading step of heating the dispersion liquid to thereby load a platinum alloy of platinum and a transition metal on a surface of the catalyst carrier powder.

Method for producing electrode catalyst, and electrode catalyst

This method for producing an electrode catalyst includes: a dispersion liquid preparation step wherein a dispersion liquid is prepared by mixing (i) at least one solvent selected from the group consisting of sulfoxide compounds and amide compounds, (ii) a catalyst carrier powder composed of a metal oxide, (iii) a platinum compound, (iv) a transition metal compound and (v) an aromatic compound that contains a carboxyl group; a loading step wherein the dispersion liquid is heated so that a platinum alloy of platinum and a transition metal is loaded on the surface of the catalyst carrier powder; a solid-liquid separation step wherein a dispersoid is separated from the dispersion liquid after the loading step, thereby obtaining a catalyst powder wherein the catalyst carrier powder is loaded with the platinum alloy; and a heat treatment step wherein the catalyst powder is heated under vacuum or in a reducing gas atmosphere.

A deoxidizer includes a porous body of fluorite-type cerium oxide represented by CeO(where x is a positive number smaller than 2) and having a reversible oxygen deficiency. The deoxidizer has a specific surface area of 0.6 to 1.8 m/g and a pore median diameter of 1.6 to 5.3 &#x3bc;m. The cerium oxide used for the deoxidizer is produced by: firing a cerium-containing salt in the atmosphere at 500&#xb0; C. to 1400&#xb0; C. for 1 to 20 hours, to produce fluorite-type cerium oxide composed of a porous body; and firing the cerium oxide at 700&#xb0; C. to 1100&#xb0; C. for 1 to 3 hours in a reducing atmosphere having a hydrogen concentration equal to or above the lower explosive limit, to remove oxygen from the cerium oxide and produce the fluorite-type cerium oxide represented by CeOand having a reversible oxygen deficiency.

Deoxidizer

A dehumidifying deoxidizer containing oxygen-deficient cerium oxide and a dehumidifier is provided. The oxygen-deficient cerium oxide is preferably doped with an element increasing the oxygen absorption of the cerium oxide. The oxygen absorption sites of the cerium oxide are preferably obstructed by a site obstructing factor. The cerium oxide preferably has a fluorite type superlattice structure. Also provided are a dehumidifying and deoxidizing packet having the dehumidifying deoxidizer sealed in a bag-shaped, gas permeable casing and a dehumidifying and deoxidizing resin composition containing the dehumidifying deoxidizer and a gas permeable resin.

Dehumidifying deoxidizer

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Saitama, Japan

Yuichi Senoo