Multi-transition metal doped copper-cobalt spinel catalyst material for NOx decomposition
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsTorin C. Peck, Ying Zhang, Krishna Gunugunuri, Charles A. Roberts, Chen Ling
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Abstract
Catalysts including multi-transition metal doped copper-cobalt spinel mixed oxide catalyst materials for direct NOx decomposition with selectivity to N2 from combustion engine exhaust, while minimizing formation of the N2O product. In one example, the catalyst may include a ternary zinc-doped copper-cobalt spinel material or a quaternary manganese+zinc doped copper-cobalt spinel material. The catalysts are effective for reducing NO to N2 at suitable temperatures of 350-500° C., with and without excess O2 presence.
Claims19
A catalyst for direct NOx decomposition from an exhaust gas stream, the catalyst comprising a zinc doped copper-cobalt spinel material having the formula:
- ZnaCubCo3-a-bO4, wherein 0.01≤a≤0.4, and 0.01≤b≤1.5.
A catalyst for direct NOx decomposition from an exhaust gas stream, the catalyst comprising a manganese+zinc doped copper-cobalt spinel material having the formula:
- MrxZnaCubCo3-x-a-bO4, wherein 0.01≤x≤0.3, 0.01≤a≤0.4, and 0.01≤b≤1.5.
A method for direct NOx decomposition with selectivity to N2 in excess O2 from combustion engine exhaust, said method comprising:
- exposing an exhaust gas having NOx at a temperature range of from 350 to 500° C. to a catalyst selected from the group consisting of:
- a catalyst comprising a zinc doped copper-cobalt spinel material having the following formula:
- ZnaCubCo3-a-bO4, wherein 0.01≤a≤0.4, and 0.01≤b≤1.5;
- and
- a catalyst comprising a manganese+zinc doped copper-cobalt spinel material having the following formula:
- MnxZnaCubCo3-x-a-bO4, wherein 0.01≤x≤0.3, 0.01≤a≤0.4, and 0.01≤b≤1.5.
Dependencies are inferred from the claim text.