Beta molecular sieve catalyst for catalytic oxidation of soot particles as well as preparation method and application of beta molecular sieve catalyst
A beta molecular sieve and soot particle technology is applied to the beta molecular sieve catalyst for catalytic oxidation of soot particles and the field of preparation thereof, which can solve the problems of low yield, high content of precious metals in the catalyst, poor selectivity, etc. The effect of catalytic activity, excellent water resistance
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Embodiment 1
[0052] (1) Pt(NH 3 ) 4 (NO 3 ) 2 Dissolve in water to prepare 2.05mmol / L Pt source solution;
[0053] (2) Mix the all-silicon β molecular sieve with the solution in step (1) according to the ratio of 1g: 12.5mL, and stir for 1h after ultrasonication for 0.5h;
[0054] (3) Rotate the product obtained in step (2) at a speed of 100r / min at 60°C for 2h under reduced pressure, then dry it at 110°C for 12h, and finally increase the temperature at a rate of 5°C / min to 700° C. and calcined at this temperature for 3 hours to obtain the catalyst, recorded as 0.5% Pt / β.
[0055] The method for evaluating the activity of the catalyst prepared in this example is as follows: In this evaluation process, carbon black is used to simulate soot particles, and a certain amount of the catalyst is taken, 40-60 mesh, and mixed with carbon black in a ratio of 10:1 by mass After uniformity, put into catalyst activity evaluation device, activity evaluation is carried out in fixed-bed reactor; The ...
Embodiment 2
[0062] (1) Pt(NH 3 ) 4 (NO 3 ) 2 Dissolve in water to prepare 4.1mmol / L Pt source solution;
[0063] (2) Mix the all-silicon β molecular sieve with the solution in step (1) according to the ratio of 1g: 12.5mL, and stir for 1h after ultrasonication for 0.5h;
[0064] (3) Rotate the product obtained in step (2) at a speed of 100r / min at 60°C for 2h under reduced pressure, then dry it at 110°C for 12h, and finally increase the temperature at a rate of 5°C / min to 700° C. and calcined at this temperature for 3 hours to obtain the catalyst, which is recorded as 1% Pt / β.
[0065] The method for evaluating the catalyst obtained in this example is exactly the same as that in Example 1.
[0066] The reaction temperature corresponding to the conversion rate of 10%, 50% and 90% of the catalytic oxidation of soot particles under the conditions of no water and 10% water content of the catalyst obtained in this embodiment is respectively denoted as T 10 , T 50 and T 90 , its data ar...
Embodiment 3
[0068] In this example, the concentration of the Pt source solution in Example 1 was replaced from 2.05mmol / L to 0.41mmol / L, and other conditions were exactly the same as in Example 1 to obtain the catalyst, which was recorded as 0.1%Pt / β.
[0069] The method for evaluating the catalyst obtained in this example is exactly the same as that in Example 1.
[0070] The reaction temperature corresponding to the conversion rate of 10%, 50% and 90% of the catalytic oxidation of soot particles under the conditions of no water and 10% water content of the catalyst obtained in this embodiment is respectively denoted as T 10 , T 50 and T 90 , its data are shown in Table 1; In this embodiment, under the conditions of no water and 10% water content, the conversion rate of catalytic oxidation soot particles is 90% corresponding to CO 2 The selectivity is shown in Table 2.
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