Integral diesel vehicle tail gas oxidization catalyst and preparation method thereof
An oxidation catalyst, a technology for diesel vehicles, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of pore structure collapse, catalyst activity decline, catalytic activity reduction and other problems, and achieve good catalytic oxidation activity and The effect of thermal stability
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Embodiment 1
[0022] This embodiment provides Pt / Y 2 o 3 / SiO 2 -Al 2 o 3 The preparation method of catalyst comprises the following steps:
[0023] (1) the calculated amount of yttrium nitrate (15wt% Y 2 o 3 ) was dissolved in deionized water and impregnated in SiO by the isoporous volume impregnation method 2 -Al 2 o 3 On the carrier, let stand for 2h;
[0024] (2) Place the sample obtained in (1) in a drying oven to dry at 60°C for 12 hours, and then bake it in a roasting furnace at 550°C for 3 hours to obtain Y 2 o 3 / SiO 2 -Al 2 o 3 Modified carrier powder;
[0025] (3) Properly dilute the platinum nitrate solution (1wt% Pt), and impregnate the Y obtained in (2) by the isoporous volume impregnation method. 2 o 3 / SiO 2 -Al 2 o 3 Powder, dry, roast the same as (2) to get Pt / Y 2 o 3 / SiO 2 -Al 2 o 3 Catalyst powder material;
[0026] (4) Grinding the catalyst powder material obtained in (3) with 2-5wt% aluminum sol and 2-5wt% acetic acid to make a catalyst slurry...
Embodiment 2
[0030] (1) The calculated amount of Ca(NO 3 ) 2 (10wt% CaO) was dissolved in deionized water and impregnated in SiO 2 -Al 2 o 3 On the support, drying, roasting (same as the step (2) of embodiment 1), make CaO / SiO 2 -Al 2 o 3 carrier material;
[0031] (2) According to the same method of embodiment 1 step (3), impregnate the platinum nitrate solution in the CaO / SiO prepared by (1) 2 -Al 2 o 3 On the carrier material, dry and calcined to obtain Pt / CaO / SiO 2 -Al 2 o 3 catalyst powder;
[0032] (3) According to the same method of steps (4) in Example 1, (5) and (6), the monolithic Pt / CaO / SiO is prepared 2 -Al 2 o 3 catalyst.
Embodiment 3
[0034] (1) Mn(NO 3 ) 2 Solution (15wt%MnO 2 ) isoporous volume method impregnated in SiO 2 -Al 2 o 3 On the carrier, drying, roasting and (the same method as step (2) of Example 1), obtain MnO x / SiO 2 -Al 2 o 3 carrier material;
[0035] (2) According to the same method of embodiment 1 step (3), impregnate the platinum nitrate solution in the CaO / SiO prepared by (1) 2 -Al 2 o 3 On the carrier material, dry and calcined to obtain Pt / MnO x / SiO 2 -Al 2 o 3 catalyst powder;
[0036] (3) According to the same method of steps (4) in Example 1, (5) and (6), the monolithic Pt / MnO is prepared x / SiO 2 -Al 2 o 3 catalyst.
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