Catalyst system for the reduction of NO
View Patent ↗A catalyst system comprising a catalyst and a reductant is disclosed. The catalyst comprises a metal oxide catalyst support, a catalytic metal oxide, and a promoting metal. The catalytic metal oxide comprises gallium oxide, indium oxide or a combination of the two. The promoting metal comprises at least one of silver, cobalt, vanadium, molybdenum, tungsten, zinc, tin and bismuth. The catalyst comprises about 5 to about 31 mol % catalytic metal oxide and about 0.5 to about 9 mol % promoting metal. The reductant comprises a fluid hydrocarbon having at least 4 carbon atoms. Also disclosed is a process for reducing NO x to N 2 using the disclosed catalyst system by mixing NO x with a reductant and passing the mixture through a catalyst of the disclosed catalyst system.
1. A catalyst system for the reduction of NOx in effluent gases from combustion sources comprising:
a catalyst comprising
a metal oxide catalyst support,
a catalytic metal oxide comprising at least one of gallium oxide and indium oxide, and
a promoting metal comprising at least one of silver, cobalt, vanadium, molybdenum, tungsten, zinc, tin and bismuth,
wherein the catalyst comprises about 5 to about 31 mol % catalytic metal oxide and about 0.5 to about 9 mol % promoting metal; and
a reductant, comprising a fluid hydrocarbon having at least 4 carbon atoms.
2. The catalyst system of claim 1 , wherein the metal oxide catalyst support comprises at least one of alumina, titania, zirconia, and ceria.
3. The catalyst system of claim 1 wherein the promoting metal further comprises indium.
4. The catalyst system of claim 3 wherein the catalyst comprises about 1 to about 5 mol % indium.
5. The catalyst system of claim 1 , wherein the catalyst comprises from about 25 to about 31 mol % gallium oxide.
6. The catalyst system of claim 1 , wherein the promoting metal comprises silver.
7. The catalyst system of claim 6 , wherein the catalyst comprises from about 1 to about 4 mol % silver.
8. The catalyst system of claim 1 , wherein the promoting metal comprises cobalt.
9. The catalyst system of claim 8 , wherein the catalyst comprises from about 1 to about 4 mol % cobalt.
10. The catalyst system of claim 1 , wherein the catalyst comprises from about 1 to about 5 mol % tungsten.
11. The catalyst system of claim 1 , wherein the catalyst comprises from about 1 to about 5 mol % molybdenum.
12. The catalyst system of claim 1 , wherein the catalyst comprises about 20 mol % to about 30 mol % gallium oxide and about 1 mol % to about 4 mol % indium oxide.
13. The catalyst system of claim 1 , wherein the reductant is gasoline.
14. The catalyst system of claim 1 , wherein the reductant comprises a hydrocarbon having eight carbon atoms.
15. A catalyst system for the reduction of NOx in effluent gases from combustion sources comprising:
a catalyst comprising
a metal oxide catalyst support, wherein the metal oxide catalyst support comprises alumina,
a catalytic metal oxide, wherein the catalytic metal oxide is selected from the group consisting of gallium oxide, indium oxide, and combinations thereof, and
a promoting metal, wherein the promoting metal is selected from the group consisting of silver, cobalt, vanadium, molybdenum, tungsten, zinc, tin, bismuth, and combinations thereof,
wherein the catalyst comprises about 5 to about 31 mol % catalytic metal oxide and about 0.5 to about 9 mol % promoting metal; and
a reductant, comprising a fluid hydrocarbon having at least 4 carbon atoms.
16. The catalyst system of claim 1 , wherein the reductant is selected from the group consisting of pentane, hexane, octane, 1-octene, trimethyl pentane, cyclooctane and 1,3-dimethyl-cyclohexane.
17. The catalyst system of claim 15 , wherein the reductant is selected from the group consisting of pentane, hexane, octane, 1-octene, trimethyl pentane, cyclooctane and 1,3-dimethyl-cyclohexane.