Tosoh Corporation

Yuuki Ito

Hiroyuki Fujisaki

Hidekazu Aoyama

Keisuke Tokunaga

Sho Azechi

Ko Ariga

Yuki Ushio

There is provided at least any of a layered body which has a change in color tone and in which it is unnecessary to select a colorant and the content of the colorant in consideration of a difference in the sintering behavior between layers, a precursor thereof, or a method for producing these. Provided is a layered body which has a structure, in which two or more layers containing stabilizer-containing zirconia and a colorant are layered, and in which types and contents of the colorants contained in the layers are equal to each other, the layered body including at least: a first layer containing a colorant and zirconia which has a stabilizer content of higher than or equal to 3.3 mol %; and a second layer containing a colorant and zirconia which has a stabilizer content different from that of the zirconia contained in the first layer.

Zirconia layered body

The chabazite-type zeolite of the present invention has a SiO/AlOmolar ratio of less than 15, and an average particle size from 1.0 &#x3bc;m to 8.0 &#x3bc;m. The chabazite-type zeolite of the present invention has excellent durability and heat resistance, and the copper-loaded chabazite-type zeolite has an improved NOx reduction rate at low temperatures compared to conventional copper-loaded chabazite-type zeolite.

Chabazite-type zeolite and method for producing same, copper loaded low-silica zeolite and NOx reductive removal catalyst containing the zeolite, and method of NOx reductive removal using this catalyst

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.

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Shunan, Japan

Yuuki Ito