MOLECULAR SIEVE CATALYST COMPOSITIONS, CATALYST COMPOSITES, SYSTEMS, AND METHODS

To provide an SCR catalyst with improved NOx conversion efficiency and lower NO generation amount.SOLUTION: Provided herein is a selective catalytic reduction material comprising spherical particles including an agglomerate of crystals of a molecular sieve, where the spherical particles have a media...

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Hauptverfasser:	BARBARA SLAWSKI, NATALIA TRUKHAN, JAYA L MOHANAN, JOHN K HOCHMUTH, FU QI, MUELLER ULRICH DR, MARTIN W KRAUS, YANG XIAOFAN, MICHAEL BREEN, AHMAD MOINI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING INORGANIC CHEMISTRY LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	To provide an SCR catalyst with improved NOx conversion efficiency and lower NO generation amount.SOLUTION: Provided herein is a selective catalytic reduction material comprising spherical particles including an agglomerate of crystals of a molecular sieve, where the spherical particles have a median particle size in a range of about 0.5 to about 5 microns. Also provided is a crystalline material effective to catalyze the selective catalytic reduction of nitrogen oxides in the presence of a reductant at temperatures between 200°C and 600°C. A method for selectively reducing nitrogen oxides and an exhaust gas treatment system are also provided.SELECTED DRAWING: Figure 5 【課題】改善されたＮＯｘ変換効率及びより低いＮ２Ｏ生成量を伴うＳＣＲ触媒を提供する。【解決手段】モレキュラーシーブの結晶の凝集体を包含する球状粒子を含み、約０．５〜約５ミクロンの範囲のメジアン粒径を有する選択的接触還元材料。また、２００℃〜６００℃の温度で還元剤の存在下に窒素酸化物の選択的接触還元を触媒するのに有効な結晶性材料。窒素酸化物を選択的に還元する方法及び排気ガス処理システムも提供する。【選択図】図５