SCR CATALYST, EXHAUST GAS CLEANING FILTER, AND EXHAUST GAS CLEANING APPARATUS

PROBLEM TO BE SOLVED: To provide a selective catalytic reduction (SCR) catalyst, exhaust gas cleaning filter, and exhaust gas cleaning apparatus, capable of improving a NOx removing ratio in a low-temperature region and suppressing degradation of the NOx removing ratio even when exposure to a hot hy...

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Hauptverfasser:	MORI KENJI, TANAKA HISAYUKI, MURAZAKI TAKANORI, SATAKE YASUSHI, SHINJO HIROBUMI, IWASAKI MASAOKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a selective catalytic reduction (SCR) catalyst, exhaust gas cleaning filter, and exhaust gas cleaning apparatus, capable of improving a NOx removing ratio in a low-temperature region and suppressing degradation of the NOx removing ratio even when exposure to a hot hydrothermal atmosphere is continued for a long time.SOLUTION: A SCR catalyst coated on DPF4 is a substance obtained by carrying a third component on a carrier composed of a first component and a second component. The first component is composed of at least either one of Sn and Sn compounds such as SnO. The second component is composed of at least any one of Ce and Ce compounds such as CeO, Fe and Fe compounds such as FeOand Cu, and Cu compounds such as CuO. The third component is composed of at least any one of W, and W compounds such as WO, Mo and Mo compound such as MoO, V and V compounds such as VO, Nb and Nb compounds such as NbOand Ta and Ta compounds such as TaO.