MOLTEN SALT-TYPE OFF GAS PURIFICATION CATALYST AND OFF GAS PURIFICATION FILTER
A molten salt-type exhaust gas purification catalyst has, as a catalyst component, a first composite metal oxide of cesium and vanadium, and a sulfate containing cesium and an alkaline earth metal.
1 . A molten salt-type exhaust gas purification catalyst comprising as a catalyst component, a first composite metal oxide of cesium and vanadium, and a sulfate containing cesium and an alkaline earth metal.
2 . The molten salt-type exhaust gas purification catalyst according to claim 1 further comprising an oxide of copper as the catalyst component.
3 . The molten salt-type exhaust gas purification catalyst according to claim 2 , wherein the oxide of copper is a second composite metal oxide of copper and vanadium.
4 . The molten salt-type exhaust gas purification catalyst according to claim 2 , wherein the oxide of copper is a third composite metal oxide of copper, vanadium, and cesium.
5 . The molten salt-type exhaust gas purification catalyst according to claim 3 , wherein on a first layer made of the second composite metal oxide, a second layer made of the sulfate containing cesium and an alkaline earth metal is superposed, and
an intermediate layer made of the first composite metal oxide and a fourth composite metal oxide of cesium, an alkaline earth metal and vanadium is formed in a region where the first layer and the second layer are in contact.
6 . The molten salt-type exhaust gas purification catalyst according to claim 3 , wherein a second layer made of the sulfate containing cesium and an alkaline earth metal is superposed on a first layer made of the second composite metal oxide, and
an intermediate layer made of the first composite metal oxide or a fourth composite metal oxide of cesium, an alkaline earth metal and vanadium is formed in a region where the first layer and the second layer are in contact.
7 . The molten salt-type exhaust gas purification catalyst according to claim 1 , wherein the first composite metal oxide is Cs 2 V 4 O 11 .
8 . The molten salt-type exhaust gas purification catalyst according to claim 3 , wherein the second composite metal oxide contains at least one of CuV 2 O 6 and Cu 2 V 2 O 7 .
9 . The molten salt-type exhaust gas purification catalyst according to claim 4 , wherein the third composite metal oxide is Cs 2 CuV 4 O 12 .
10 . The molten salt-type exhaust gas purification catalyst according to claim 1 , wherein the alkaline earth metal is magnesium.
11 . The molten salt-type exhaust gas purification catalyst according to claim 1 , wherein the alkaline earth metal is barium.
12 . The molten salt-type exhaust gas purification catalyst according to claim 1 being carried on titanium dioxide and being more than 1 wt % and 100 wt % or less of the titanium dioxide.
13 . The molten salt-type exhaust gas purification catalyst according to claim 1 being carried on a basic carrier.
14 . The molten salt-type exhaust gas purification catalyst according to claim 13 , wherein the basic carrier contains at least one of magnesium oxide, magnesium aluminum oxide, and zirconium dioxide.
15 . An exhaust gas purification filter, wherein the molten salt-type exhaust gas purification catalyst according to claim 1 is applied to a filter of ceramic or metal.
16 . An exhaust gas purification filter, wherein the molten salt-type exhaust gas purification catalyst according to claim 1 is carried on silicon dioxide, and the exhaust gas purification catalyst being more than 1 wt % and 100 wt % or less of the silicon dioxide is applied to a diesel particulate filter made of SiC.