Catalyzed ceramic candle filter and method of cleaning process off- or exhaust gases
AssigneeHaldor TopsøE A/S
InventorsFrancesco CASTELLINO, Lars Storm PEDERSEN
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Abstract
Ceramic candle filter and use of the filter in the removal of particulate matter in form of soot, ash, metals and met-al compounds, together with hydrocarbons and nitrogen oxides being present in process off-gas or engine exhaust gas, the filter includes a combined SCR and oxidation catalyst being arranged on the dispersion side and within wall of the filter; and a palladium including catalyst arranged on the permeation side and within wall of the filter facing the permeation side.
Claims12
A ceramic candle filter suitable for the removal of particulate matter in form of soot, ash, metals and metal compounds, together with hydrocarbons and nitrogen oxides being present in process off-gas or engine exhaust gas, the filter comprises a combined SCR and oxidation catalyst arranged at least on the dispersion side and/or within wall of the filter;
- and a palladium comprising catalyst arranged on the permeation side of the filter and within wall of the filter facing the permeation side.
A method for the removal of particulate matter in form of soot, ash, metals and metal compounds, together with hydrocarbons and nitrogen oxides being present in process off-gas or engine exhaust gas, comprising the steps of
- providing a process off-gas or engine exhaust gas containing a nitrogenous reductant or adding the nitrogenous reductant to process off- or exhaust gas;
- passing the off- or the exhaust gas to a ceramic candle filter and capturing the particulate matter on dispersion side of the filter;
- reducing amounts of soot in the particulate matter captured on the dispersion side of the filter and reducing amounts of hydrocarbons in the off- or exhaust gas by oxidation and reducing amounts of nitrogen oxides by selective catalytic reduction (SCR) of the nitrogen oxides with the nitrogenous reductant in contact with a combined SCR and oxidation catalyst being arranged on the dispersion side and/or within wall of the filter;
- and
- passing the gas through the wall of the filter and reducing amounts of carbon monoxide and ammonia in the gas passing through the filter wall by contact with a palladium comprising catalyst arranged on the permeation side of the filter and/or within the wall of the filter facing the permeation side.
Dependencies are inferred from the claim text.