Tosoh Corporation

Hiroshi Ogawa

Masao Nakano

Keiji Itabashi

Yukio Ito

Hidekazu Aoyama

Keisuke Tokunaga

Hiroshi Miura

Ko Ariga

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

An adsorbent for a hydrocarbon, comprising a calcined &bgr;-type zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d&equals;1.15&plusmn;0.03 nm and d&equals;0.397&plusmn;0.01 nm, is at least 90% of the diffraction intensity at d&equals;0.346&plusmn;0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3).

Absorbent for a hydrocarbon, and exhaust gas-purifying catalyst

A method for adsorbing and removing ethylene in an exhaust gas, comprises contacting with the gas an adsorbent comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO,/Al,O,molar ratio being at least 15.

Method for adsorbing and removing ethylene and method for purifying an exhaust gas

A method for purifying an exhaust gas by contacting the exhaust gas with an exhaust gas-purifying catalyst comprising a nitrogen oxide-removing catalyst and an adsorbent for ethylene comprising a zeolite which contains Ag, and also Pd, optionally which has a ferrierite structure.

Adsorbent for ethylene, method for adsorbing and removing ethylene and

An adsorbent for ethylene, comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio being at least 15.

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Shunan, Japan

Hiroshi Ogawa