Catalyst for purifying tail gas of diesel automobiles, preparation method and purification device thereof

An exhaust gas purification, diesel vehicle technology, applied in physical/chemical process catalysts, exhaust devices, chemical instruments and methods, etc., can solve the problems of being easily poisoned by sulfur, need to be further improved, and limited PM elimination.

Active Publication Date: 2012-06-13
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of these technologies is that the efficiency of the catalytic converter is high, but it is easily poisoned by sulfur, so it is necessary to use low-sulfur fuel and install sulfur adsorption and removal equipment
[0004] In recent years, positive progress has been made in the research of a single four-way purification catalyst in China. For example, the Eco-environmental Research Center of the Chinese Academy of Sciences has developed a 2 Selective removal of HC, CO and NO under atmosphere x The catalytic system mainly includes porous inorganic support and noble metals such as Pt, Au and Ag, etc., NO x The highest conversion rate is more than 90%, but the elimination of PM is very limited
China University of Petroleum (Patent No. 200710307416.8, tit

Method used

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  • Catalyst for purifying tail gas of diesel automobiles, preparation method and purification device thereof
  • Catalyst for purifying tail gas of diesel automobiles, preparation method and purification device thereof
  • Catalyst for purifying tail gas of diesel automobiles, preparation method and purification device thereof

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Experimental program
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preparation example Construction

[0073] (2) Preparation of coating

[0074] 1) First coat

[0075] 1. take by weighing the proportioning corresponding nitrate (except Ba salt) of the first coating by the proportioning of table 2, heat and dissolve with a small amount of deionized water, must mix the nitrate solution;

[0076] ② Take the proportioning in Table 2 and weigh the Ba(CH 3 COO) 2 , add deionized water to dissolve, and obtain a solution containing Ba ions;

[0077] ③Weigh the ratio of Table 2 and weigh the γ-Al of the first coating ratio 2 o 3 powder, add the mixed nitrate solution described in step ①, and stir for 90-110min to obtain a mixed solution;

[0078] ④ Diffusely inject the Ba ion-containing solution obtained in step ② into the mixed solution obtained in step ③, and stir while adding to obtain the immersion solution;

[0079] ⑤ ball mill the immersion solution obtained in step ④ for 1 hour at a speed of 250r / min to obtain the first coating immersion solution;

[0080] 2) Second coat ...

Embodiment 1

[0093] Take one cordierite and one SiC wall flow carrier with a size of φ144mm×152mm, soak in deionized water for 30min, dry at 80°C for 4 hours, and bake at 350°C for 30min before use.

[0094] ① DOC preparation: weigh La(NO 3 ) 3 .6H 2 O: 243g, Ce(NO 3 ) 3 .6H 2 O: 235.5g, Zr(NO 3 ) 4 ·5H 2 O: 231.2g, Sr(NO 3 ) 2 : 56.7g, Fe(NO 3 ) 3 9H 2 O: 108.6g, NH 4 VO 3 : 32g, Al(NO 3 ) 3 9H 2 O: 770.6g, placed in a 5000ml beaker and heated to melt, then add 74.1g of Ba(CH 3 COO) 2 Saturated solution and 942.2g γ-Al 2 o 3 Nano powder, 80g inorganic thixotropic agent, the volume of the deployment solution is 4000ml, electric stirring for 100min., 250rpm ball milling for 1 hour to obtain the DOC coating immersion solution. Then immerse the treated cordierite carrier in the solution for 30min, and after taking it out, 0.3MPaN 2 Blow air, dry at 80°C for 4 hours, and bake at 550°C for 1 hour. Calculate the weight of the carrier to be used when it increases by more tha...

Embodiment example 2

[0100] What is different from embodiment 1 is to change DOC and CDPF composition, all the other process parameters are constant:

[0101] DOC coating composition is: La(NO 3 ) 3 .6H 2 O: 612g, Ce(NO 3 ) 3 .6H 2 O: 207.6g, Co(NO 3 ) 4 ·6H 2 O: 536.9g, Sr(NO 3 ) 2 : 101.5g, Fe(NO 3 ) 3 9H 2 O: 93.8g, NH 4 VO 3 : 27.7g, Al(NO 3 ) 3 9H 2 O: 695.4g, γ-Al 2 o 3 Nano powder 907.7g, inorganic thixotropic agent 80g

[0102] The composition of DPF is: La(NO 3 ) 3 .6H 2 O: 1232g, KNO 3 : 82.8g, Ce(NO 3 ) 3 ·6H 2 O: 177.6g, Mn(NO 3 ) 2 : 204.4g, Co(NO 3 ) 2 ·6H 2 O: 331.8g, Al(NO 3 ) 3 9H 2 O: 736g, γ-Al 2 o 3 Nano powder 503.7g, TiO 2 Nano powder 400g.

[0103] The test results of purification rate are: HC75.8%, CO96.8%, PM92.8%, NO x 56.1%.

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Abstract

The invention relates to a catalyst for purifying tail gas of diesel automobiles, a preparation method and a purification device thereof. The catalyst comprises a first carrier taking cordierite honeycomb ceramics as a matrix, and a second carrier taking SiC or a cordierite wall-flow structure as a matrix, a first coating and active components on the first carrier, as well as a second coating and active components on the second carrier. In the invention, coating, roasting and reduction processes are adopted for preparing the coatings composed of composite oxides. The catalyst and the device in the invention employ a technology combining a DOC (diesel oxidation converter) and a CDPF (catalyzed diesel particulate filter). By means of the DOC at a front end, HC, CO as well as the soluble organic fractions (SOF) in PM are removed through oxidation. Meanwhile, NO is converted to NO2 that has stronger reducibility so as to be good for the reaction of NO2 and C, thus reaching the purposes of removing NO and lowering the combustion temperature of C simultaneously. Depending on the self-temperatures of diesel automobiles to realize regeneration of a particulate filter, the purification device in the invention has the characteristics of high purification efficiency and convenient usage, etc.

Description

technical field [0001] The invention relates to a diesel automobile tail gas purification catalyst, a preparation method and a purification device. Background technique [0002] Diesel vehicle exhaust has a complex chemical composition, and with the change of engine operating conditions, the composition of exhaust gas is also significantly different. The pollutants emitted include soot particulate matter (PM), hydrocarbons (HC), CO and NOx, etc. Because of the O in the exhaust 2 The content is higher, so the HC and CO emissions are less, generally only 1 / 10 of gasoline engines, the NOx emissions are roughly the same as gasoline engines, and the PM emissions are about dozens of times that of gasoline engines. [0003] With the continuous expansion of the global production of passenger diesel vehicles, the exhaust emission of diesel vehicles has aroused widespread concern in the society. Especially since the implementation of Euro IV emission standards in 2005, the post-treat...

Claims

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Application Information

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IPC IPC(8): B01J27/224B01J23/89B01D53/94B01D53/56B01D53/62B01D53/72F01N3/28
CPCY02A50/20
Inventor 陈德茂刘奇刘庆宾翟步英阳浩张登友薄新维杨晓亮
Owner CHONGQING MATERIALS RES INST
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