Tosoh Corporation

Ebara Corporation

Keisuke Tokunaga

Shigeru Hirano

Yoju Shimizu

Hajime Funakoshi

Makoto Komatsu

Takeshi Izumi

Takashi Sakuma

Ko Ariga

Yuki Oba

Hidekazu Aoyama

Yusuke Naraki

Hiroshi Ogawa

Hiroshi Okaniwa

Yuuki Ito

Megu Fukui

A zeolite molded article includes 100 parts by weight of zeolite, 35 parts by weight or more and 70 parts by weight or less of clay, 5 parts by weight or more and 40 parts by weight or less of a silica sol and 0.5 parts by weight or more and 10 parts by weight or less of a water-soluble sodium salt, having an abrasion resistance of 90% or more, an angle of repose of 40° or less, an aerated bulk density on the surface of the zeolite molded article of 0.5 kg/L or more, and a sphericity of the zeolite molded article of 1 or more and 3 or less. The zeolite contains at least one type of zeolite having Si/Alof 10 or more and 100,000 or less and a moisture adsorption amount of 10 (g/100 g) or less at 25° C. under a relative pressure of 0.5.

Highly wear-resistant zeolite molded article, and method for manufacturing same

A high-strength zeolite molding includes 10 parts by weight or more and 40 parts by weight or less of clay relative to 100 parts by weight of zeolite, and having a compressive strength of 20 N or more, in which the zeolite contains at least one zeolite that has Si/Alof 300 or more and 100000 or less and a water adsorption amount of 10 (g/100 g) or less under conditions of 25° C. and a relative pressure of 0.5, and the clay contains at least one clay that has a solid acidity of 0.15 mmol/g or less as determined by a NH-TPD method. A method for producing includes kneading, molding, drying and disintegrating a product and then firing at 400° C. or higher and 700° C. or lower.

High-strength zeolite molding and production method therefor

The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2&#x3b8;=8.8&#xb0;&#xb1;0.5&#xb0;, 2&#x3b8;=10.0&#xb0;&#xb1;0.5&#xb0;, and 2&#x3b8;=29.6&#xb0;&#xb1;0.5&#xb0;.

Adsorption method for at least one of cesium and strontium employing silicotitanate having sitinakite structure

The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.

Treatment method of radioactive iodine-containing fluid

A xenon adsorbent capable of efficiently adsorbing xenon, even at a low concentration, from a mixture gas is Provided. A xenon adsorbent comprising a zeolite having a pore size in the range of 3.5 to 5 &#x212b; and a silica alumina molar ratio in the range of 10 to 30.

Xenon adsorbent

Provided are: a silver-carrying zeolite molded article in which aggregation of silver is inhibited and which has excellent capability of dispersing silver, when compared to conventional silver-carrying zeolite molded articles; and a method for producing the silver-carrying zeolite molded article. In the silver-carrying zeolite molded article, the molar ratio of Si/Alis 2.0-3.0, the molar ratio of (alkali metal+Ag)/Al is 0.9-1.1, the total amount of SiO, AlO, AgO, and alkali metal oxides is 90 wt % or more, the contained amount of silver ions is 5 wt % or more, and only a single type of zeolite is contained. The molded article can be produced by subjecting a zeolite molded article having zeolite purity of 90% or more to an ion exchange treatment using a silver-containing aqueous solution.

Silver-carrying zeolite molded article

Composition including silicotitanate having sitinakite structure, and production method for same

The invention relates to: a &#x3b2;-type iron silicate which has a fluorine content not more than 400 ppm by weight on a dry basis and in which the crystal grains have a truncated square bipyramidal morphology in an examination with a scanning electron microscope and the whole or part of the iron is contained in the &#x3b2;-type framework structure, and a process for producing the iron silicate; anther &#x3b2;-type iron silicate, and a process for producing the iron silicate; and a nitrogen oxide removal catalyst containing the other &#x3b2;-type iron silicate, a process for producing the catalyst, and a method for nitrogen oxide removal with the catalyst.

Metallosilicates, processes for producing the same, nitrogen oxide removal catalyst, process for producing the same, and method for removing nitrogen oxide with the same

An SCR catalyst including iron-containing &#x3b2;-type zeolite has high NOreducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200&#xb0; C.). A high NOreduction rate of at least 45% at a temperature not higher than 200&#xb0; C. is achieved by an SCR catalyst containing iron-containing &#x3b2;-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction () plane of from 0.28 to 0.34&#xb0; and a weight loss on heating to 900&#xb0; C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing &#x3b2;-type zeolite at 700 to 850&#xb0; C. under an atmosphere of a water vapor concentration of not more than 5% by volume.

Highly hydrothermal-resistant SCR catalyst and manufacturing method therefor

An SCR catalyst using a &#x3b2;-zeolite in which the molar ratio of SiO/AlOis from 20 to less than 40, the particle diameter determined by SEM is 0.35 &#x3bc;m or more, the full width at half maximum (FWHM) of the X-ray diffraction peak for (302) is less than 0.30&#xb0;, and the amount of adsorbed NHis 1 mmol/g or more, or has an amount of adsorbed NHfollowing hydrothermal aging of 0.4 mmol/g or more, demonstrates high catalytic activity for NOx reduction at low temperatures following hydrothermal aging while also demonstrating a low level of discharge of irritating ammonia in exhaust gas.

&#x3b2;-Zeolite for SCR catalyst and method for purifying nitrogen oxides using same

A chabazite-type zeolite having copper and an alkali earth metal supported thereon. The alkali earth metal is preferably at least one metal selected from the group consisting of calcium, magnesium and barium. Moreover, the SiO/AlOmolar ratio is preferably from 10 to 50, and the copper/aluminum atomic ratio is preferably from 0.15 to 0.25. This type of chabazite-type zeolite exhibits a higher nitrogen oxide purification rate after a hydrothermal durability treatment than those of conventional chabazite-type zeolite catalysts on which only copper is supported.

Growing community of inventors

Yamaguchi, Japan

Keisuke Tokunaga