DOC matched with SCR and preparation method thereof

A catalyst and oxidation-type technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low NOx conversion rate at low temperature and failure to meet the requirements of emission standards and regulations, and achieve close cooperation and good catalytic conversion effect , Improve the effect of stability and activity

Active Publication Date: 2018-12-04
SINOCAT ENVIRONMENTAL TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the low-temperature NOx conversion rate of diesel vehicle SCR in the prior art, which cannot meet the requirements of emission standards, and to provide a low-temperature oxidation of NO to NO 2 Or low-temperature storage of NOx to solve the low-temperature NOx emission problem diesel vehicle oxidation catalyst

Method used

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  • DOC matched with SCR and preparation method thereof
  • DOC matched with SCR and preparation method thereof
  • DOC matched with SCR and preparation method thereof

Examples

Experimental program
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Effect test

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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Abstract

The invention relates to a diesel vehicle oxidization catalyst, which includes noble metals comprising, but not limited to one or more of Pt, Pd, Rh and the like. The diesel vehicle oxidization catalyst includes a front end and a rear end, wherein the palladium content of the front end is higher than that of the rear end. The oxidization DOC catalyst is matched with SCR and can oxidize NO into NO2at low temperature, so that catalytic initiation temperature of HC and CO is reduced as most as possible, and the capability of oxidizing NO into NO2 at a low temperature (200 DEG C) is enhanced. A corresponding method is also provided in the invention, which is easy to carry out and is low in cost.

Description

technical field [0001] The invention relates to a diesel vehicle oxidation catalyst (Diesel Oxidation Catalyst, DOC) matched with SCR (Selective Catalytic Reduction, SCR, selective catalytic reduction) and a preparation method. The diesel vehicle oxidation catalyst can oxidize NO to NO at low temperature (such as the temperature range of 100-200°C lower than 200°C) 2 , to assist the downstream SCR low-temperature rapid reaction, improve the low-temperature NOx conversion rate of the system, or store NOx in the low-temperature section, and release it after the SCR conversion efficiency increases after the exhaust gas temperature rises, so as to control low-temperature NOx emissions. Background technique [0002] In China V test cycle ETC and ESC and in China VI test cycle WHSC and WHTC (such as figure 1 ), the low exhaust temperature of diesel vehicles accounts for a large proportion, especially in the time range of 0-150s when diesel vehicles are initially started, the over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J29/068B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J23/42B01J29/068
Inventor 王瑞芳龚国恒王云魏宽李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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