Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification

A technology for purifying catalysts and automobile exhaust, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. , the difficulty of catalytic coating and other problems, to achieve the effect of convenient industrial production, large specific surface, and reducing the amount of precious metals

Inactive Publication Date: 2014-11-26
NEIMENGGU METALLURGICAL INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the cold start performance of the catalyst, the third major problem of the three-way catalyst for automobile exhaust purification is that the location of the catalytic converter is getting closer and closer to the engine exhaust port. The operating temperature of these catalysts can reach 1000°C-1100°C. The oxygen storage material CeO 2 -ZrO 2 Sintering is easy to occur, which reduces the ability to store and release oxygen
[0004] At present, most of the oxygen storage and release materials in domestic and foreign synthetic automobile exhaust purification catalysts adopt the defects of co-precipitation method. The synthesis process of co-precipitation method is to precipitate zirconium and rare earth nitrate with ammonia water to produce zirconium hydroxide and rare earth hydroxide, and wash other ions , drying, calcination, and jet milling, the final product has a large particle size and a small specific surface area, and the biggest disadvantage of the process is that it pollutes the environment, consumes a lot of energy, and produces a large amount of ammonia nitrogen wastewater, which does not conform to the national industrial policy. High difficulty

Method used

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  • Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification
  • Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification
  • Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Solution configuration:

[0032] It is preliminarily estimated to synthesize 20g of multi-component rare earth cerium-zirconium solid solution, and the mass fractions of each rare earth oxide are: ZrO 2 (wt): 49.40%, CeO 2 (wt): 35.8%, La 2 o 3 (wt): 9.76%, Nd 2 o 3 (wt): 3.28%, Y 2 o 3 (wt): 1.76%, according to the proportion, the preparation of Zr(NO 3 ) 4 The concentration of the solution is 1.88mol / L, the preparation of Ce(NO 3 ) 3 The concentration of the solution is 1.10mol / L, and La(NO 3 ) 3 The concentration of the solution is 0.423mol / L, Y(NO 3 ) 3 The molar concentration is 0.54mol / L, the preparation of Nd(NO 3 ) 3 The molar concentration is 0.417mol / L;

[0033] Take Zr(NO 3 ) 4 The volume of solution is V1=42.66ml, Ce(NO 3 ) 3 The volume of solution is V2=37.82mL, La(NO 3 ) 3 The volume of the solution is V3=28.32mL, Y(NO 3 ) 3 The volume of solution is V4=5.78mL, Nd(NO 3 ) 3The volume of solution is V3=9.35mL, these five kinds o...

Embodiment 2

[0038] (1) Solution configuration:

[0039] It is preliminarily estimated to synthesize 20g of multi-component rare earth cerium-zirconium solid solution, and the mass fractions of each rare earth oxide are: ZrO 2 (wt): 49.40%, CeO 2 (wt): 35.8%, La 2 o 3 (wt): 9.76%, Nd 2 o 3 (wt): 3.28%, Y 2 o 3 (wt): 1.76%, according to the proportion, the preparation of Zr(NO 3 ) 4 The concentration of the solution is 1.88mol / L, the preparation of Ce(NO 3 ) 3 The concentration of the solution is 1.10mol / L, and La(NO 3 ) 3 The concentration of the solution is 0.423mol / L, Y(NO 3 ) 3 The molar concentration is 0.54mol / L, the preparation of Nd(NO 3 ) 3 The molar concentration is 0.417mol / L;

[0040] Take Zr(NO 3 ) 4 The volume of solution is V1=42.66ml, Ce(NO 3 ) 3 The volume of solution is V2=37.82mL, La(NO 3 ) 3 The volume of the solution is V3=28.32mL, Y(NO 3 ) 3 The volume of solution is V4=5.78mL, Nd(NO 3 ) 3 The volume of solution is V3=9.35mL, these five kinds ...

Embodiment 3

[0045] (1) Solution configuration:

[0046] It is preliminarily estimated to synthesize 20g of multi-component rare earth cerium-zirconium solid solution, and the mass fractions of each rare earth oxide are: ZrO 2 (wt): 49.40%, CeO 2 (wt): 35.8%, La 2 o 3 (wt): 9.76%, Nd 2 o 3 (wt): 3.28%, Y 2 o 3 (wt): 1.76%, according to the proportion, the preparation of Zr(NO 3 ) 4 The concentration of the solution is 1.88mol / L, the preparation of Ce(NO 3 ) 3 The concentration of the solution is 1.10mol / L, and La(NO 3 ) 3 The concentration of the solution is 0.423mol / L, Y(NO 3 ) 3 The molar concentration is 0.54mol / L, the preparation of Nd(NO 3 ) 3 The molar concentration is 0.417mol / L;

[0047] Take Zr(NO 3 ) 4 The volume of solution is V1=42.66ml, Ce(NO 3 ) 3 The volume of solution is V2=37.82mL, La(NO 3 ) 3 The volume of the solution is V3=28.32mL, Y(NO 3 ) 3 The volume of solution is V4=5.78mL, Nd(NO 3 ) 3 The volume of solution is V3=9.35mL, these five kinds ...

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Abstract

The invention discloses a preparation method of a multi-element rare earth oxygen storage and release material in a three-effect catalyst of automobile emission purification. The preparation method comprises the following steps: with nitrate solutions of zirconium, cerium, lanthanum, neodymium and yttrium as a rare earth source and citric acid as a chelating agent, forming a chelate precursor through a sol-gel method, performing spray-drying on the obtained wet gel to obtain dry gel precursor powder, then rotating and calcining under a dynamic high-temperature furnace, and carrying out ball-milling through a superfine airflow to obtain a powder body of the multi-element rare earth oxygen storage and release material. According to the method for synthesizing the multi-element rare earth oxygen storage and release material, disclosed by the invention, the process is simple, no three industrial wastes are generated, no pollution is caused to the environment, convenience is brought for industrial production, and thus the method has an important significance for developing a new generation of high-performance automobile emission purification catalyst.

Description

technical field [0001] The invention relates to a preparation method of an oxygen storage and release material in an automobile tail gas purification catalyst, in particular to a preparation method of a multi-element rare earth oxygen storage and release material in an automobile tail gas purification catalyst. Background technique [0002] The pollution problem of automobile exhaust has attracted more and more attention in today's society. There are three main types of pollutants emitted by automobile exhaust, namely unburned or partially burned hydrocarbons (HC), products of incomplete combustion of fuel Carbon monoxide (CO) and nitrogen oxides (NO 2 ), mainly NO. Among the many methods of controlling vehicle exhaust emissions, the application of catalytic conversion technology is the most effective means to achieve ultra-low emissions of vehicle exhaust. Automobile exhaust gas purification catalyst converts three harmful substances in the exhaust gas, HC, CO and NO, int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/94B01D53/56B01D53/62B01D53/72
Inventor 路红霞景慧白鸽张玲玲李林范永忠
Owner NEIMENGGU METALLURGICAL INST
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