Test method for durability performance of scr catalyst

Abstract

The invention discloses a test method for the durability performance of an SCR catalyst, which comprises the following steps: selecting two sets of fresh SCR catalysts as samples A and B; performing aging treatment on the sample A; The sample B for aging treatment is packaged separately with the same packaging process; the packaged samples A, B or sample B, A are successively assembled into the same engine; for the engine equipped with sample A and sample B, respectively Carry out the emission test; the test conditions of the emission test include the two situations of SCR injection system not injecting urea and injecting urea; calculate the deterioration coefficient of SCR catalyst and the error of urea consumption according to the test results; if the deterioration coefficient of SCR catalyst and the error of urea consumption are both If it is within the corresponding preset range, the SCR catalyst durability test is qualified. This method can accurately evaluate the durability performance of SCR catalysts.

Description

technical field [0001] The invention relates to the technical field of engine aftertreatment, in particular to a test method for the durability performance of an SCR catalyst. Background technique [0002] As emission regulations become more and more stringent, the requirements for engine aftertreatment technology are getting higher and higher. In order to meet the emission regulations on soot and nitrogen oxides, the engine mainly uses SCR (Selective Catalytic Reduction, Selective Catalytic Reduction System) To reduce the emission of nitrogen oxides; SCR catalyst is a key component of the after-treatment system, and it is very important to scientifically and effectively evaluate the durability of the SCR catalyst. [0003] At present, there is no specific durability test for SCR catalysts. Usually, the entire SCR catalytic muffler (including SCR catalyst, carrier, etc.) is used as the test object, and the overall deterioration coefficient is obtained. The specific test meth...

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Problems solved by technology

[0015] The degradation coefficient of the above method is based on the consideration of the SCR catalytic muffler as a whole, and it is impossible to decompose the weight of the engine, SCR after-treatment system and SCR catalyst to cause emission degradation, which makes it impossible to accurately evaluate the catalyst in the engine bench test of the SCR catalytic converter In addition, the calculation method of the above degradation coefficient is based on the absolute value of the emission, which cannot clearly explain the difference in the conversion efficiency of the catalyst before and after the durability test

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