HIGHLY HEAT-RESISTANT BETA-ZEOLITE AND SCR CATALYST USING SAME

A subject for the invention is to provide a highly heat-resistant SCR catalyst which has an NOx reduction percentage of 40% or higher at 200°C after a hydrothermal durability treatment. The invention relates to use of ²-type zeolite which has an SiO 2 /Al 2 O 3 molar ratio of 20 or higher but less t...

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Bibliographische Detailangaben
Hauptverfasser:	TAKAMITSU, Yasuyuki, ITO, Yukio
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A subject for the invention is to provide a highly heat-resistant SCR catalyst which has an NOx reduction percentage of 40% or higher at 200°C after a hydrothermal durability treatment. The invention relates to use of ²-type zeolite which has an SiO 2 /Al 2 O 3 molar ratio of 20 or higher but less than 30 and a crystallite diameter before a hydrothermal durability treatment of 20 nm or larger, shows a change in crystallite through the hydrothermal durability treatment of less than 10%, and has a fluorine content lower than 0.1 %. The ²-type zeolite can be crystallized from a liquid reaction mixture containing a secondary and/or a tertiary alkylamine having 5 or more carbon atoms.