A preparation process of a gasoline vehicle catalytic converter conforming to the Euro VI standard
A preparation process and gasoline vehicle technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve improved catalytic performance, improved adsorption, and improved adsorption Effect
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[0052] (2) Preparation of active aluminum slurry:
[0053] Raw materials: The molar ratio of Al, Ce, La and non-noble metal M in the active slurry is: 100:10~20:2~5:1~3; the non-noble metal M is the sum of Ba and Cu; the molar ratio of Ba and Cu The ratio is 100:25~40.
[0054] Add the nitrate solution of Al, Ce, La, Ba and Cu to the citric acid solution containing propyl acetate and ethanol under the condition of stirring; Stir at ℃~80℃ for 1h~2h, and obtain a sol after the stirring is completed.
[0055] In order to facilitate the calculation of the relationship between the added reagents, Al is used as a reference reagent in the present invention, and other reagents can be compared on the basis of Al. The molar ratio of the total amount of Al in the nitrate solution to the total amount of citric acid in the citric acid solution is 100:200~500, that is, when the nitrate contains 100mol of Al, the amount of citric acid added is 100~300mol. The molar ratio of citric acid, p...
Embodiment 1
[0076] A preparation process of a gasoline vehicle catalyst conforming to the Euro VI standard, comprising the following steps:
[0077] (1) Pretreatment of the carrier:
[0078] Put the cordierite honeycomb carrier in the mixed solution of malic acid and polyethylene glycol for 8 hours, then take it out, wash it with water, and dry it for later use. The mass fraction of malic acid in the mixed solution was 15%, and the mass fraction of polyethylene glycol was 8%.
[0079] (2) Preparation of active aluminum slurry:
[0080] Prepare the nitrate solution of Al, Ce, La, Ba and Cu, the ratio of Al, Ce, La, Ba and Cu in the solution is 100:15:3:1.538:0.462. The nitric acid solution contains 100 mol of Al, and the citric acid solution is added under stirring; the citric acid solution contains 200 mol of citric acid, 15 mol of propyl acetate, and 300 mol of ethanol.
[0081] After the addition, the mixed liquid was stirred at 30° C. for 3 h, and at 75° C. for 2 h, and a sol was ob...
experiment example 1
[0088] experimental method:
[0089] Take multiple cordierite honeycomb carriers, wash them with clean water to remove surface dust and impurities, soak them in different treatment solutions as shown in Table 1 for 8 hours, and then take them out for cleaning and drying. After drying, the specific surface area and strength were measured, and the test results are shown in Table 1. Wherein the control group was untreated carrier.
[0090] Specific surface area measurement: Quantachrome direct-reading dynamic flow method specific surface area analyzer Monosorb; the present invention takes the control group as a reference, sets its specific surface area and strength as 100%, and the calculation method of the specific surface area expansion rate of the remaining experimental groups is: Using the same instrument and method, the ratio of the difference between the parameters of the specific surface area of the experimental group and the parameters of the control group to the param...
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