Catalyst for collecting particulate matter in diesel vehicle exhaust

Abstract

The invention provides a diesel vehicle exhaust particle capturing catalyst. The catalyst is composed of a metal shell and an inner core, wherein the inner core is a columnar body and formed by stacking inertia alumina porcelain balls coated with binding agents; the cross section of the inner core is round, square, oval or racetrack-shaped; multiple exhaust channels are evenly arranged inside the inner core and are arranged in the circumferential or radial direction; the sections of the channels are rectangular, round and fan-shaped; the sum of the sectional areas of the channels is not larger than 25% of the sectional area of the inner core; and the length of the channels in the axis direction is 60%-100% that of the columnar body. According to the diesel vehicle exhaust particle capturing catalyst, as the binding agents evenly coating the porcelain balls have a large number of pores, the specific area is large, and the adsorption effect of particles is high; and as the exhaust channels of the diesel vehicle exhaust particle capturing catalyst are each of a special-shaped structure, the capturing effect of the particles is very high.

Description

technical field [0001] The invention relates to a diesel vehicle tail gas purification product, in particular to a diesel vehicle tail gas particle collection catalytic converter. Background technique [0002] In order to reduce the environmental pollution caused by automobile emissions, exhaust gas purification devices are generally required to be installed on the engine exhaust pipeline. For fuel vehicle engines, the exhaust gas generally contains harmful substances such as CO, HC, NOx and soot particles, especially for diesel engines. , the content of soot particles is relatively large. Therefore, in the exhaust pipeline of diesel engines, it is generally necessary to install exhaust particulate matter collection catalysts to remove harmful soot particles through physical filtration and oxidation reactions. Even If no special particulate matter trapping catalyst is installed, the clogging of particulate matter should also be considered. At present, there are two main typ...

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Problems solved by technology

Patent CN203783701U changes the local structure of traditional honeycomb ceramics, enhances the ventilation and anti-blocking effect, but reduces the specific surface area, reduces the catalytic conversion effect, and increases the manufacturing cost; although the patent CN203783692U has a good particle trapping effect, the cost of the device itself is high , the back pressure is large, especially the regeneration of the device is difficult

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