HYDROCARBON ADSORBENT AND CATALYST FOR CLEANING WASTE GAS

摘要

PROBLEM TO BE SOLVED: To obtain an adsorbent having a high adsorption capacity for hydrocar bon and a high heat resistance by preparing an adsorbent for hydrocarbon used for cleaning waste gas containing hydrocarbon from calcined β zeolite having the sum of X-ray diffraction intensities of a particular value against a specified diffraction intensity. SOLUTION: This adsorbent for hydrocarbon must comprise βzeolite. This βzeolite has a composition of x M2/n O.Al2 O3 .ySiO2 .zH2 O (wherein n is valence of cation M, x is a number within the range of 0 to 2.5, y is 1 or higher number and z is 0 or higher number). The sum of diffraction intensities of this zeolite for lattice plane distances of X ray powder diffraction d=1.15±0.03 nm and 0.397±0.01 nm must be a crystallinity of not less than 90% against a diffraction intensity of d=0.346±0.01 nm in terms of the Catalyst Society reference catalyst JRC-Z-HM-20, in conditions after the zeolite is calcined for removing organic substances contained when the zeolite is synthesized.