Catalyst for purifying tail gas of diesel automobiles, preparation method and purification device thereof

An exhaust gas purification, diesel vehicle technology, applied in physical/chemical process catalysts, chemical instruments and methods, air quality improvement, etc., can solve the problems of limited PM elimination, easy to be poisoned by sulfur, and needs to be further improved
CN102489322BActive Publication Date: 2013-12-11CHONGQING MATERIALS RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING MATERIALS RES INST
Publication Date
2013-12-11

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Abstract

The invention relates to a catalyst for purifying tail gas of diesel automobiles, a preparation method and a purification device thereof. The catalyst comprises a first carrier taking cordierite honeycomb ceramics as a matrix, and a second carrier taking SiC or a cordierite wall-flow structure as a matrix, a first coating and active components on the first carrier, as well as a second coating and active components on the second carrier. In the invention, coating, roasting and reduction processes are adopted for preparing the coatings composed of composite oxides. The catalyst and the device in the invention employ a technology combining a DOC (diesel oxidation converter) and a CDPF (catalyzed diesel particulate filter). By means of the DOC at a front end, HC, CO as well as the soluble organic fractions (SOF) in PM are removed through oxidation. Meanwhile, NO is converted to NO2 that has stronger reducibility so as to be good for the reaction of NO2 and C, thus reaching the purposes of removing NO and lowering the combustion temperature of C simultaneously. Depending on the self-temperatures of diesel automobiles to realize regeneration of a particulate filter, the purification device in the invention has the characteristics of high purification efficiency and convenient usage, etc.
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Description

technical field

[0001] The invention relates to a diesel automobile tail gas purification catalyst, a preparation method and a purification device. Background technique

[0002] Diesel vehicle exhaust has a complex chemical composition, and with the change of engine operating conditions, the composition of exhaust gas is also significantly different. The pollutants emitted include soot particulate matter (PM), hydrocarbons (HC), CO and NOx, etc. Because of the O in the exhaust 2 The content is higher, so the HC and CO emissions are less, generally only 1 / 10 of gasoline engines, the NOx emissions are roughly the same as gasoline engines, and the PM emissions are about dozens of times that of gasoline engines.

[0003] With the continuous expansion of the global production of passenger diesel vehicles, the exhaust emission of diesel vehicles has aroused widespread concern in the society. Especially since the implementation of Euro IV emission standards in 2005, the post-treat...

Claims

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