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Barium-transition metal-cerium base oxide catalyst for eliminating carbon smoke

A technology of cerium-based oxides and transition metals, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., can solve the problem of harmful soot particles threatening human health , to achieve the effects of convenient control of the reaction process, low production cost, and meeting the exhaust temperature requirements

Active Publication Date: 2010-01-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Diesel engine is a power device with good power, economy and durability, but the harmful soot particles emitted by it seriously threaten human health and have become one of the bottlenecks restricting the wide application of diesel engine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 2.777g of ammonium cerium nitrate, 0.241g of cobalt acetate and 15ml of water into a 200ml beaker, stir to dissolve, then add 2.836g of citric acid under stirring at room temperature, and then add 0.3g of polyethylene glycol (molecular weight 400) after dissolving After the dropwise addition, heat and stir at 80°C until the water evaporates to produce a viscous colloid. Then the obtained colloid was dried in the air atmosphere at 110°C for 12 hours, taken out and pulverized, pre-calcined at 300°C for 1 hour, calcined at 500°C for 3 hours, and cooled in the furnace to obtain a Co-Ce composite oxide, abbreviated as (CoO y ) 0,1 (CeO 2 ) 0.9 . Take 0.241g of barium nitrate and dissolve it in 0.9g of deionized water. Add 1.5g of the prepared Co-Ce composite oxide into the barium nitrate solution, stir evenly, heat and dry at 110°C for 3 hours, calcinate at 550°C for 1 hour, and cool in the furnace to prepare Ba-loaded barium-cobalt-cerium Ba 0.1 / (CoO) 0,1 (CeO ...

Embodiment 2

[0027] Add 2.777g of ceric ammonium nitrate, 0.230g of nickel chloride and 15ml of water in a 200ml beaker, stir and dissolve, then add 2.836g of citric acid under stirring at room temperature, and then add 0.3g of polyethylene glycol (molecular weight 200 ), after the dropwise addition, heat and stir at 80°C until the water evaporates to produce a viscous colloid. Then dry the obtained colloid in air atmosphere at 110°C for 12 hours, take it out and grind it finely, pre-calcine at 300°C for 1 hour, calcinate at 500°C for 3 hours, and cool in the furnace to obtain Ni-Ce composite oxide, abbreviated as (NiO) 0,1 (CeO 2 ) 0.9 . Take 0.241g of barium nitrate and dissolve it in 0.9g of deionized water. Add the prepared 1.5g Ni-Ce composite oxide into the barium nitrate solution, stir evenly, heat and dry at 110°C for 3 hours, calcinate at 550°C for 1 hour, and cool in the furnace to prepare Ba-loaded barium-nickel-cerium Ba 0.1 / (NiO) 0,1 (CeO 2 ) 0.9 catalyst. The conten...

Embodiment 3

[0029] Add 2.777g of ammonium cerium nitrate, 0.272g of ferric sulfate and 15ml of water into a 200ml beaker, stir to dissolve, then add 2.836g of citric acid under stirring at room temperature, and then add 0.3g of polyethylene glycol (molecular weight 600) after dissolving After the dropwise addition, heat and stir at 80°C until the water evaporates to produce a viscous colloid. Then the obtained colloid was dried at 110°C for 12 hours in an air atmosphere, taken out and ground into fine pieces, pre-calcined at 300°C for 1 hour, calcined at 500°C for 3 hours, and cooled in the furnace to obtain Fe-Ce composite oxide, abbreviated as (FeO 1.5 ) 0,1 (CeO 2 ) 0.9 . Take 0.247g of barium nitrate and dissolve it in 0.9g of deionized water. Add 1.5g of the Fe-Ce composite oxide prepared into the barium nitrate solution, stir evenly, heat and dry at 110°C for 3 hours, calcinate at 550°C for 1 hour, and cool in the furnace to prepare Ba-loaded barium-iron-cerium Ba 0.1 / (FeO 1...

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PUM

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Abstract

The invention discloses a barium-transition metal-cerium base oxide catalyst utilizing nitric oxides in tail gas of a diesel vehicle to catalyze and combust carbon smoke in an assistant mode, which belongs to the technical field of tail gas catalysts of motor vehicles. The oxide catalyst is prepared by a sol-gel method, and the introduction of Ba is realized by a dipping and loading method or a precursor doped sol-gel method; rare-earth cerium and salts or chloride salts of transition metals of copper, cobalt, nickel and iron are used as raw materials, and a complexing agent and a thickening agent are added to the raw materials to prepare a transition metal-cerium base compound oxide; and the Ba is introduced by a precursor doping or dipping and loading method to prepare a Bax / (MOy)0.1(CeO2)0.9 catalyst. The oxide catalyst has simple process and easy realization of industrial production. The maximum combustion speed temperature Tm of the carbon smoke can be reduced from 530 DEG C without a catalyst to 390-440 DEG C, and combustion is complete. A product basically has no CO, thus the oxide catalyst can meet the requirement of environmental protection, has high combustion speed and enables a particulate catcher to quickly regenerate.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, in particular to a soot-eliminating barium-transition metal-cerium-based oxide catalyst for eliminating soot particles in diesel vehicle exhaust by using nitrogen oxides to assist catalytic combustion. Background technique [0002] Diesel engine is a power device with good power, economy and durability, but the harmful soot particles emitted by it seriously threaten human health, which has become one of the bottlenecks restricting the wide application of diesel engine. At the same time, diesel engine exhaust also contains a considerable concentration of nitrogen oxides (NO x ). Installing a particulate filter on the exhaust line of a diesel engine is a cost-effective aftertreatment technology. It collects the soot particles in the diesel engine exhaust in the trap by means of interception and deposition. When the soot has accumulated to a certain extent, it is removed b...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/78B01J37/02B01J37/00B01J37/08B01D53/94B01D53/62
Inventor 吴晓东翁端林繁王蕾
Owner TSINGHUA UNIV