Metal tungstates for use as nitrogen oxides reduction catalysts
AssigneesToyota Motor Engineering & Manufacturing North America, Inc., Toyota Jidosha Kabushiki Kaisha
InventorsHongfei Jia, Charles A. Roberts, Mitsuru Sakano, Keiichi Minami, Torin C. Peck, Paul T. Fanson
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Abstract
A nitrogen oxide (NOx) reduction catalyst that includes a transition metal tungstate having the formula: MWO4 wherein M is selected from the group consisting of Mn, Fe, Co, Ni, and Cu. The catalyst may be utilized in various environments including oxygen rich and oxygen deficient environments.
Claims11
A process of reducing nitrogen oxide (NOx) including the steps of:
- providing a gaseous exhaust mixture including nitrogen oxide (NOx) and hydrocarbon fuel;
- providing a nitrogen oxide (NOx) reduction catalyst including a transition metal tungstate having the formula:
- MWO4 wherein M is selected from the group consisting of Mn, Fe, Co, Ni, and Cu;
- contacting the gaseous exhaust mixture with a surface of the nitrogen oxide (NOx) reduction catalyst forming nitrogen, water and carbon dioxide.
A process of reducing nitrogen oxide (NOx) including the steps of:
- providing a gaseous exhaust mixture including nitrogen oxide (NOx) and hydrocarbon fuel;
- providing a nitrogen oxide (NOx) reduction catalyst including a transition metal tungstate having the formula:
- MWO4 wherein M is selected from the group consisting of Mn, Fe, Co and Cu;
- contacting the gaseous exhaust mixture with a surface of the nitrogen oxide (NOx) reduction catalyst in the presence of oxygen and forming nitrogen, water and carbon dioxide.
A process of reducing nitrogen oxide (NOx) including the steps of:
- providing a gaseous exhaust mixture including nitrogen oxide (NOx) and hydrocarbon fuel;
- providing a nitrogen oxide (NOx) reduction catalyst including a transition metal tungstate having the formula:
- MWO4 wherein M is selected from the group consisting of Mn, Fe, Co, Ni, and Cu;
- contacting the gaseous exhaust mixture with a surface of the nitrogen oxide (NOx) reduction catalyst in an oxygen deficient environment and forming nitrogen, water and carbon dioxide.
Dependencies are inferred from the claim text.