Catalytic converter and method for cleaning exhaust gas
AssigneeSiemens Aktiengesellschaft
InventorsRonald Neufert, Frank Witzel
Life of this patent
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Abstract
The invention relates to a catalytic converter and a method for cleaning the exhaust gas from an internal combustion engine which is operated with excess air. The catalytic converter has an active material made from the oxides TiO2, V2O5, CaO and SiO2, as well as WO3 and/or MoO3. An active material of this type has the property of using the SCR method to reduce to equal extents the levels of nitrogen oxides and hydrocarbons. The CO oxidation activity of a material of this type can be increased by metering in elements selected from the group consisting of Pt, Pd, Rh, Ru and Ir in any desired inorganic form.
Claims20
A catalytic converter for purifying an exhaust gas from an engine operated with excess air, comprising a catalytically active material with the oxides TiO2, V2O5, CaO and SiO2 and at least one oxide selected from the group consisting of WO3 and MoO3, wherein the proportions of said oxides are, in % by weight:
- TiO2:
- 70-95 WO3 and/or MoO3:
- 2-10 V2O5:
- 0.1-5 CaO:
- 0.1-8 SiO2:
- 0.1-10.
A catalytically active composition for purifying exhaust gas from the combustion of fuel in an engine, comprising the oxides TiO2, V2O5, CaO and SiO2 and at least one oxide selected from the group consisting of WO3 and MoO3, wherein the proportions of said oxides are, in % by weight:
- TiO2:
- 70-95 WO3 and/or MoO3:
- 2-10 V2O5:
- 0.1-5 CaO:
- 0.1-8 SiO2:
- 0.1-10.
Dependencies are inferred from the claim text.