Zoned catalyst for treating exhaust gas
AssigneeJohnson Matthey Public Limited Company
InventorsOlivier Sonntag, Tim Genschow, Andrew Newman, Isabel Zoe Tingay, Gudmund Smedler
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Abstract
Provided is a system for treating an exhaust gas comprising a first SCR catalyst zone comprising vanadium loaded on a metal oxide selected from TiO2, ZrO2, SiO2, CeO2, and Al2O3; and a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system. Also provided is a method for using the system to treat exhaust gas.
Claims20
A system for treating an exhaust gas comprising:
- a. a first SCR catalyst zone comprising vanadium loaded on a metal oxide selected from TiO2, ZrO2, SiO2, CeO2, and Al2O3;
- and
- b. a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system.
A method for treating an exhaust gas comprising the step of contacting, in series, a mixture of ammonia and exhaust gas derived from an internal combustion engine with (a) a first SCR zone comprising vanadium loaded on a metal oxide selected from TiO2, ZrO2, SiO2, CeO2, and Al2O3, and (b) a second SCR zone comprising a copper-loaded small pore molecular sieve.
Dependencies are inferred from the claim text.