A kind of doc used with scr and its preparation method
A catalyst and oxidation-type technology, applied in the direction of separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low low-temperature NOx conversion rate and failure to meet the requirements of emission standards and regulations, and achieve improved hydrothermal durability performance , increase low-temperature adsorption storage capacity, low cost effect
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example 3
[0107] as per Figure 8 The process scheme shown prepares the oxidized catalyst of the present invention.
[0108] Mix platinum nitrate and palladium nitrate precious metal solution, and load it on alumina material (BET=170m 2 / g), dried at 60°C for 12h, and calcined at 400°C for 2h to obtain 1.2% Pt 13 / Pd 5 / Al 2 o 3 (Pt:Pd=13:5), denoted as M1-3.
[0109] Mix M1-3 with the binder aluminum sol, ball mill for 10 minutes, the binder accounts for 2%, and the solid content is 40%, D 50 = 5 μm of slurry N1-3.
[0110] Platinum nitrate solution was loaded into β molecular sieve by equal volume impregnation method, dried at 60°C for 12 hours, and calcined at 400°C for 2 hours to obtain 0.8% Pt / β molecular sieve, denoted as M2-3.
[0111] Mix M2-3 with the adhesive silica sol, ball mill for 10 minutes, the adhesive accounts for 2%, and the solid content is 40%, D 50 = 3 μm of slurry N2-3.
[0112] Coat N1-3 on the front end 1 / 2 of the cordierite carrier, and the specificati...
example 4
[0115] Mix platinum nitrate and palladium nitrate precious metal solution, and load it on alumina material (BET=170m 2 / g), dried at 60°C for 12h, and calcined at 400°C for 2h to obtain 1.4% Pt 9 / Pd 5 / Al 2 o 3 (Pt:Pd=9:5), denoted as M1-4.
[0116] Mix M1-4 with the binder aluminum sol, ball mill for 10 minutes, the binder accounts for 2%, and the solid content is 40%, D 50 = 5 μm of slurry N1-4.
[0117] Platinum nitrate solution was loaded into β molecular sieve by equal-volume impregnation method, dried at 60°C for 12 hours, and calcined at 400°C for 2 hours to obtain 0.8% Pt / β, denoted as M2-4.
[0118] Mix M2-4 with the adhesive silica sol, ball mill for 10 minutes, the adhesive accounts for 2%, and the solid content is 40%, D 50 = 3 μm of slurry N2-4.
[0119] Coat N1-4 on the front end 1 / 3 of the cordierite carrier, and the specifications of the cordierite carrier are the same as reference 1.
[0120] Coat N2-4 onto the rear 2 / 3 of the cordierite support. Aft...
example 5
[0122] Cerium nitrate is loaded onto the alumina material (BET=170m 2 / g), drying at 60°C for 12h, and calcining at 400°C for 2h to obtain 1%Ce-Al 2 o 3 , recorded as M01-5.
[0123] Mix platinum nitrate and palladium nitrate noble metal solutions, load them into M01-5 by equal volume impregnation method, dry at 60°C for 12h, and calcinate at 400°C for 2h to obtain 1.4% Pt 9 / Pd 5 / Al 2 o 3 -Ce (Pt:Pd=9:5), denoted as M1-5.
[0124] Mix M1-5 with the binder aluminum sol, ball mill for 10 minutes, the binder accounts for 2%, and the solid content is 40%, D 50 = 5 μm of slurry N1-5.
[0125] The ammonium molybdate solution was loaded into β molecular sieves by equal volume impregnation method, dried at 60°C for 12 hours, and calcined at 400°C for 2 hours to obtain 1% Mo / β, which was designated as M02-5.
[0126] Platinum nitrate solution was loaded into M02-5 by equal-volume impregnation method, dried at 60°C for 12 hours, and calcined at 400°C for 2 hours to obtain 0.8%...
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