An adsorbent for a hydrocarbon, comprising a calcined β-type zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society refe
An adsorbent for a hydrocarbon, comprising a calcined β-type zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3).
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1. A method for adsorbing and removing a hydrocarbon in a gas phase, which comprises contacting an adsorbent for a hydrocarbon, which adsorbent comprises a calcined beta zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm a
1. A method for adsorbing and removing a hydrocarbon in a gas phase, which comprises contacting an adsorbent for a hydrocarbon, which adsorbent comprises a calcined beta zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3), with the gas phase. 2. The method according to claim 1, wherein the hydrocarbon to be adsorbed and removed is a straight chain paraffin having at least 7 carbon atoms, a straight chain olefin having at least 7 carbon atoms, and/or a polycyclic aromatic compound. 3. The method according to claim 1, wherein the hydrocarbon to be adsorbed and removed is a straight chain paraffin having from 10 to 18 carbon atoms, or a straight chain olefin having from 10 to 18 carbon atoms. 4. The method according to claim 1, wherein the beta zeolite contains a transition metal. 5. The method according to claim 4, wherein the transition metal is at least one member selected from Cu and Ag. 6. A method for purifying an exhaust gas, which comprises contacting an exhaust gas-purifying catalyst comprising (1) an adsorbent for a hydrocarbon which comprises a calcined beta zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3), and (2) a nitrogen oxide removing catalyst having an active metal contained in a porous material, with the exhaust gas. 7. The method according to claim 6, wherein the nitrogen oxide-removing catalyst is one having at least one active metal selected from noble metals consisting of Pt, Pd, Ir and Rh, contained in a porous material, and the average particle size of the noble metals is at least 10 nm. 8. A method for adsorbing and removing a hydrocarbon from a gas phase, comprising: contacting an adsorbent for a hydrocarbon which is a straight chain paraffin or olefin, each having at least 7 carbon atoms, and/or a polycyclic aromatic compound, which adsorbent comprises a calcined β-zeolite showing a powder X-ray diffraction pattern such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3), with the gas phase. 9. A method for purifying an exhaust gas, which comprises: contacting an exhaust gas-purifying catalyst comprising (1) an adsorbent that is a calcined β-zeolite showing a powder X-ray diffraction pattern such that the sum of X-ray diffraction intensities at lattice spacings d=1.15±0.03 nm and d=0.397±0.01 nm, is at least 90% of the diffraction intensity at d=0.346±0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3) for a hydrocarbon which is a straight chain paraffin or olefin, each having at least 7 carbon atoms, and/or a polycyclic aromatic compound, and (2) a nitrogen oxide removing catalyst having an active metal contained in a porous material, with the exhaust gas.
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