Method and catalyst unit for treating diesel engine exhaust
AssigneeHaldor Topsoe A/S
InventorHaldor Frederik Axel Tops.o slashed.e
Life of this patent
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Abstract
A method for the removal of particulate matter contained in exhaust gas from a diesel fuelled engine. The exhaust gas stream is passed over a carrier having supported thereon one or more inorganic compounds which are in the form of a melt or subcooled melt, the particulate matter in the exhaust gas stream on the melt and/or subcooled melt is adsorbed, the combustibles in the adsorbed particulate matter are burned off, and an exhaust gas stream substantially free of particulate matter is withdrawn.
Claims11
A method for the removal of particulate matter contained in exhaust gas from a diesel fuelled engine comprising passing the exhaust gas stream over a carrier having supported thereon one or more inorganic compounds, which are in the form of at least one of a melt and subcooled melt during contact with the exhaust gas stream, said inorganic compounds being selected from eutectic compositions of Cs.sub.2 O. V.sub.2 O.sub.5. K.sub.2 O. V.sub.2 O.sub.5 ;
- Na.sub.2 O. V.sub.2 O.sub.5 ;
- CsVO.sub.3. NaVO.sub.3. KVO.sub.3 ;
- K.sub.2 SO.sub.4. Na.sub.2 SO.sub.4. ZnSO.sub.4 /CuSO.sub.4 ;
- KCuNbO.sub.4 and mixtures thereof;
- absorbing the particulate matter in the exhaust gas stream on the melt or subcooled melt of the inorganic compounds;
- burning off combustibles in the absorbed particulate matter, and
- withdrawing an exhaust gas stream being substantially free of particulate matter.
A regenerative catalyst unit for use in the removal of particulate matter from diesel exhaust gas, said catalyst unit comprising at least one catalyst chamber holding a catalyst having supported on a porous surface thereof one or more inorganic compounds, which are in the form of a melt at least one of a melt and subcooled melt in subcooled melt during contact with the exhaust gas and are active in the burning of particulates, said inorganic compounds being selected from eutectic composition of Cs.sub.2 O. V.sub.2 O.sub.5. K.sub.2 O. V.sub.2 O.sub.5 ;
- Na.sub.2 O. V.sub.2 O.sub.5. CsVO.sub.3. NaVO.sub.3. KVO.sub.3 ;
- K.sub.2 SO.sub.4. Na.sub.2 SO.sub.4. ZnSO.sub.4 /CuSO.sub.4 ;
- KCuNbO.sub.4 and mixtures thereof;
- and a regenerator at the inlet and outlet end of the catalyst chamber, said regenerator being in the form of a fixed bed of ceramic bodies with the high heat storage capacity, said catalyst unit including means whereby the direction of flow of the exhaust gas is periodically reversed, so that the exhaust gas is preheated in the inlet regenerator by heat contained in hot exhaust gas being withdrawn from the catalyst chamber and having been passed through the regenerator prior to reversal of the exhaust gas flow direction.
Dependencies are inferred from the claim text.