Abstract: According to the invention, the emission of polycyclic aromatic hydrocarbons (PAH) from the exhaust-gas system of diesel motors with particle filters can be minimized or prevented. During the regeneration of the particle filter, the polycyclic aromatic hydrocarbons (PAH) are first fixed in adsorption layers and are cracked there at high temperatures. The cracking products are then preferably eliminated in an oxidation step.

Abstract: The invention relates to a method for reducing NOx in exhaust gas flows of a motor vehicle, by means of a catalyst. The method is characterized in that an NOx absorbing material is provided in the catalyst.

Abstract: The invention relates to a catalyst for purifying NOX in the flow of exhaust gas of motor vehicles, and is characterized in that the catalyst contains modified clay minerals selected from the group consisting of bentonites, smectites, hectorites and mixtures thereof, all of which being pillared with aluminium, silicon or titanium (oxides).

Abstract: The invention concerns a regenerable particle filter for removing soot particles from exhaust gases, especially from diesel engines. In a filter housing, a ceramic filter body is arranged between an exhaust gas supply pipe and an exhaust gas discharge pipe. The filter body has a large number of channels distributed over the cross section in a honeycomb or checkerboard pattern. The channels are closed alternately at their ends so that the exhaust gas after entering into one group of channels must flow through the porous walls to the other group of channels in order then to arrive at the exhaust gas discharge pipe. Electric heating elements are arranged at the closed end of the channels open toward the exhaust gas supply pipe. Upon heating they ignite the soot particle deposit which accumulates here to an elevated degree. Since scarcely any gas flow prevails in the vicinity of the heating elements good combustion of the soot takes place and therefore a reliable regeneration of the filter.

Abstract: The invention concerns a regenerable particle filter for removing soot particles from exhaust gases, especially from diesel engines. In a filter housing, a ceramic filter body is arranged between an exhaust gas supply pipe and an exhaust gas discharge pipe. The filter body has a large number of channels distributed over the cross section in a honeycomb or checkerboard pattern. The channels are closed alternately at their ends so that the exhaust gas after entering into one group of channels must flow through the porous walls to the other group of channels in order then to arrive at the exhaust gas discharge pipe. Electric heating elements are arranged at the closed end of the channels open toward the exhaust gas supply pipe. Upon heating they ignite the soot particle deposit which accumulates here to an elevated degree. Since scarcely any gas flow prevails in the vicinity of the heating elements good combustion of the soot takes place and therefore a reliable regeneration of the filter.