Preparation method of DOC (diesel oxidation catalyst) for exhaust gas emission of diesel engine

A type of exhaust emission and oxidation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc.
CN107983345AInactive Publication Date: 2018-05-04NANJING IKAKAT EMISSIONS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING IKAKAT EMISSIONS TECH CO LTD
Publication Date
2018-05-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a DOC (diesel oxidation catalyst) for the exhaust gas emission of a diesel engine. The preparation method comprises the following steps: (a) weighing modified aluminum oxide, modified cerium-zirconium oxide and deionized water, carrying out ball milling for a period of time, and testing the particle size of slurry D50 which is 3-5 microns; (b) slowlydropwise adding a noble metal salt solution into the slurry so as to maintain the pH value of the slurry to be 9-10; (c) carrying out carrier coating; and (d) calcining. According to the preparationmethod, a DOC coating layer has a relatively low ignitiontemperature and can be rapidly ignited even when the exhaust gas temperature is not high; very high conversion efficiencies of HC and CO can beachieved; the exhaust gas temperature can be greatly increased, and the oxidation performance and the DPF regeneration performance can be improved; and NO in exhaust gas can be effectively convertedinto NO2, so that the regeneration of dry soot in DPF is promoted.
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Description

technical field

[0001] The invention relates to the technical field of automobile tail gas treatment, in particular to a method for preparing a DOC oxidation catalyst for diesel engine tail gas emission. Background technique

[0002] In recent years, the development momentum of diesel vehicles is very rapid. Compared with gasoline vehicles, diesel vehicles have many advantages such as superior environmental performance, good power performance and less fuel consumption. Therefore, compared with gasoline vehicles, diesel vehicles have better economy, and are more and more concerned and favored by everyone. At the same time, diesel vehicle exhaust emission standards are becoming increasingly stringent, which also puts forward higher requirements for diesel vehicle exhaust after-treatment technology. Among them, the diesel vehicle oxidation catalyst (DOC,) is an indispensable part of the diesel vehicle exhaust gas treatment system. DOC catalyst can oxidize CO, HC, NO and othe...

Claims

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