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Absorbent for storing nitrogen oxides of diesel engine and lean-burn gasoline engine and preparation of absorbent

A nitrogen oxide and gasoline engine technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical/physical process, physical/chemical process catalyst, etc., can solve the problem of ineffective storage and nitrogen oxide storage capacity Poor, no adsorption storage capacity and other problems, to achieve the effect of reducing costs and improving storage capacity

Active Publication Date: 2015-04-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nitrogen oxide storage materials have been greatly developed, the storage capacity of nitrogen oxides in the low temperature range is relatively poor
From a thermodynamic point of view, it is difficult for Pt to oxidize NO into NO in the temperature range of 50-250 °C. 2 , and this step is NO X One of the most important reaction steps in the storage process; at the same time, the commonly used storage material BaO does not have very good NO X Adsorption storage capacity, resulting in NO X can not be effectively stored

Method used

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  • Absorbent for storing nitrogen oxides of diesel engine and lean-burn gasoline engine and preparation of absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Mn-Sn-O X Adsorbent. Prepare 0.12mol L -1 of (NH 4 ) 2 S 2 o 4 Solution 500mL, add 2.02824g MnSO 4 ·H 2 O, 6.3104g SnCl 4 ·5H 2 0; after stirring evenly, add an appropriate amount of ammonia water drop by drop, and adjust the pH value at about 10.0; stir and age for 3h at 50°C on a magnetic stirrer; wash with deionized water and suction filter 4 times to remove impurity ions in the solution; The samples were dried in an oven at 110°C for 24h, the dried block was crushed, and roasted in a muffle furnace at 500°C for 4h to obtain a Mn, Sn molar ratio of 4:6 (expressed as Mn 0.4 sn 0.6 ) Mn-Sn-O X .

[0026] MnO X with SnO 2 The mass fractions are 25.9% and 74.1%, respectively.

[0027] Adsorption performance test reaction conditions:

[0028] 0.2g catalyst, 500ppm NO, 5% O 2 , the balance gas is nitrogen, and the space velocity is 48,000mLh -1 g -1 .

[0029] Mn at 100°C 0.4 sn 0.6 Adsorption performance results such as figure 1 As sh...

Embodiment 2

[0031] Preparation of Mn-Sn-Ce-O X Adsorbent. Prepare two 0.12mol L -1 of (NH 4 ) 2 S 2 o 4 Each solution is 500mL. 2.02824g MnSO was added successively to the first solution 4 ·H 2 O, 5.2587g SnCl 4 ·5H 2 O and 1.3027g Ce(NO 3 ) 3 ·6H 2 O; 2.02824 g MnSO was sequentially added to the second solution 4 ·H 2 O, 3.1552g SnCl 4 ·5H 2O and 3.9080g Ce(NO 3 ) 3 ·6H 2 O; After stirring evenly, add an appropriate amount of ammonia water drop by drop to adjust the pH value to about 10.0; stir and age on a magnetic stirrer at 50°C for 3 hours; then wash with deionized water and suction filter 4 times to remove impurity ions in the solution; The obtained sample was dried in an oven at 110°C for 24h, the dried block was crushed, and roasted in a muffle furnace at 500°C for 4h to obtain a molar ratio of Mn, Sn, and Ce of 4:5:1 (expressed as Mn 0.4 sn 0.5 Ce 0.1 ) and 4:3:3 (expressed as Mn 0.4 sn 0.3 Ce 0.3 ) of Mn-Sn-Ce-O X .

[0032] In both cases, MnO X , CeO...

Embodiment 3

[0035] Preparation of Mn-Sn-Ce-O X Adsorbent. Prepare two 0.12mol L -1 of (NH 4 ) 2 S 2 o 4 Each solution is 500mL. 2.02824g MnSO was added successively to the first solution 4 ·H 2 O, 5.2587gSnCl 4 ·5H 2 O and 1.3027g Ce(NO 3 ) 3 ·6H 2 O; 2.02824 g MnSO was sequentially added to the second solution 4 ·H 2 O, 3.1552g SnCl 4 ··5H 2 O and 3.9080g Ce(NO 3 ) 3 ·6H 2 O; After stirring evenly, add an appropriate amount of ammonia water drop by drop to adjust the pH value to about 10.0; stir and age on a magnetic stirrer at 50°C for 2 hours; then wash with deionized water and suction filter 3 times to remove impurity ions in the solution; The obtained sample was dried in an oven at 110°C for 24h, the dried block was crushed, and roasted in a muffle furnace at 500°C for 6h to obtain a molar ratio of Mn, Sn, and Ce of 4:5:1 (expressed as Mn 0.4 sn 0.5 Ce 0.1 ) and 4:3:3 (expressed as Mn 0.4 sn 0.3 Ce 0.3 ) of Mn-Sn-Ce-O X .

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Abstract

The invention discloses an absorbent for storing nitrogen oxides of a diesel engine and a lean-burn gasoline engine. The absorbent comprises the following components in percentage by weight: 24-26wt% of MnOX, 35-75wt% of SnO2 and 0-41wt% of CeO2, wherein the MnOX represents an oxide of Mn. The invention also provides a preparation method of the absorbent. The absorbent disclosed by the invention has the advantages that due to no containing of noble metals such as Pt and Pd, the cost is greatly reduced; and under the conditions of simulated flue gas with the temperature of 100 DEG C, the air speed of 48,000mLh<-1>g<-1>, NO of 500ppm and O with the content of 25%, the storage capacity of the nitrogen oxides is 290.1-541.2 micromoles / g, so that the storage capability of the nitrogen oxides with the temperature of 100 DEG C is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide control in environmental protection, and particularly relates to an adsorbent for storing nitrogen oxides in diesel engines and lean-burn gasoline engines and its preparation. Background technique [0002] With the rapid development of social economy, my country's motor vehicle industry is developing rapidly. Since the 1990s, the annual growth rate of my country's car ownership has reached as high as 13% to 15%. While automobiles bring high efficiency and convenience to human life and social development, the NO contained in the exhaust gas emitted by automobiles X Toxic pollutants such as , CO, HC and particulate matter have deteriorated the atmospheric environment and threatened the living environment of human beings. [0003] For the nitrogen oxide catalytic purification technology of diesel vehicles and lean-burn gasoline vehicle exhaust, the selective catalytic reduction technology (S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J23/34B01D53/94B01D53/56
CPCB01D53/565B01D53/9409B01D2257/40B01D2258/0283B01J20/06B01J20/3085B01J23/34B01J2220/42
Inventor 李俊华孙晓旭雷颖魏丽斯郝吉明
Owner TSINGHUA UNIV
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