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Biomorphic hierarchical porous La0.9K0.1CoO3 catalyst and preparation method thereof

A biomorphic, multi-level pore technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve catalyst shedding, specific surface area and catalytic activity reduction, Catalyst coating problems and other problems, to achieve the effect of complete pore channels, low preparation cost, and uniform pore shape

Inactive Publication Date: 2013-09-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Removal of NO from diesel engine exhaust at present stage x The catalyst carrier of PM and PM mainly uses honeycomb ceramics, but the coating of the catalyst on the carrier is a difficult problem
In addition, the distribution of the catalyst in the carrier and the reaction with the carrier are involved in the coating process, and problems such as catalyst shedding, specific surface area and catalytic activity reduction are prone to occur during use.

Method used

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  • Biomorphic hierarchical porous La0.9K0.1CoO3 catalyst and preparation method thereof
  • Biomorphic hierarchical porous La0.9K0.1CoO3 catalyst and preparation method thereof
  • Biomorphic hierarchical porous La0.9K0.1CoO3 catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 12.9906g La(NO 3 )·6H 2 O, 0.3271g CH 3 COOK, 8.3030g Co(CH 3 COO) 2 4H 2 O and 13.2113 g of glucose were dissolved in 100 ml of deionized water. In a water bath at 60°C for 70h, after cooling, La 0.9 K 0.1 CoO 3 Sol.

[0031] The pine block is cut into length: width: height = 40mm: 30mm: 10mm, dried at 100°C for 24h, soaked in a mixed solution with acetone / ethanol volume ratio of 3 for 4 days, then dried at 80°C for 5 days; The pine blocks were continuously impregnated in La 0.9 K 0.1 CoO 3 After five days in the sol solution, the surface was cleaned with distilled water and dried at 60°C for three days.

[0032] The impregnated pine wood block was pyrolyzed under flowing argon. Firstly, the temperature was raised to 120°C at a rate of 3°C / min, and kept at a temperature of 30 minutes. Raise the temperature to 800 °C at a rate of 10 °C / min, keep it for 3 hours, and then cool to room temperature with the furnace to obtain the NO x The conversion effic...

Embodiment 2

[0034] Weigh 12.9906g La(NO 3 )·6H 2 O, 0.3271g CH 3 COOK, 8.3030g Co(CH 3 COO) 2 4H 2 O and 13.2113 g of glucose were dissolved in 100 ml of deionized water. In a water bath at 70°C for 50h, after cooling, La 0.9 K 0.1 CoO 3 Sol.

[0035] The pine block is cut into length: wide: high=40mm: 30mm: 10mm, dried at 120°C for 24h, boiled in 5wt.% ammonia solution for 8h, then dried the treated pine block at 50°C for 3 days; then Continuous impregnation of treated pine blocks in La 0.9 K 0.1 CoO 3 After 6 days in the sol solution, the surface was cleaned with distilled water and dried at 80°C for 2 days.

[0036] The impregnated pine wood block was pyrolyzed under flowing argon. Firstly, the temperature was raised to 110°C at a rate of 2°C / min, and kept at a temperature of 40 minutes. Then, the temperature was raised to 450°C at a rate of 3°C / min. Raise the temperature to 700 °C at a rate of 10 °C / min, keep it for 3 hours, and then cool to room temperature with the furn...

Embodiment 3

[0038] Weigh 12.9906g La(NO 3 )·6H 2 O, 0.3271g CH 3 COOK, 8.3030g Co(CH 3 COO) 2 4H 2 O and 13.2113 g of glucose were dissolved in 100 ml of deionized water. In a water bath at 50°C for 60h, after cooling, La 0.9 K 0.1 CoO 3 Sol.

[0039] The pine blocks were cut into length: width: height = 40mm: 30mm: 10mm, dried at 120°C for 24 hours, and the pine blocks without any pretreatment were continuously impregnated in La 0.9 K 0.1 CoO 3 Sol diluted solution for 3 days, the surface was cleaned with distilled water, and dried at 50°C for 4 days.

[0040] The impregnated pine wood block was pyrolyzed under flowing argon. First, the temperature was raised to 130°C at a rate of 4°C / min, and kept for 35 minutes, then raised to 350°C at a rate of 1°C / min, and kept for 3 hours. Raise the temperature to 900°C at a rate of 8°C / min, hold for 2 hours, and then cool to room temperature with the furnace to obtain the NO x The conversion efficiency of the hierarchically porous La w...

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Abstract

The invention discloses a biomorphic hierarchical porous La0.9K0.1CoO3 catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing La0.9K0.1CoO3 sol by using a sol-gel method based on lanthanum nitrate, potassium acetate, cobaltous acetate and glucose as raw materials; and dipping a pretreated pine block into a La0.9K0.1CoO3 sol diluent, and pyrolyzing after drying to obtain the catalyst. By using the preparation method, the problems that the catalyst is complexly coated on a carrier and the catalyst is easy to drop in the use process are avoided. The biomorphic hierarchical porous La0.9K0.1CoO3 catalyst has the characteristics of convenience, high efficiency, high catalytic property and the like, and is especially suitable for posttreatment of rail gases of a diesel engine.

Description

technical field [0001] The invention belongs to perovskite type catalyst technology, more specifically, relates to a kind of biomorphic hierarchical porous La 0.9 K 0.1 CoO 3 Catalyst and method for its preparation. Background technique [0002] In recent years, diesel vehicles have taken an increasing share in the field of motor vehicles due to their advantages in economy, power and greenhouse gas emissions. However, nitrogen oxides (NO x ) and particulates (PM) seriously endanger human health and pollute the atmospheric environment. Therefore, reducing PM and NO in diesel vehicles x The emissions have become an important direction for the development of diesel engines in the world today. At present, catalytic purification is a major technical means to reduce exhaust pollutants. In order to reduce costs, rare earth elements have great potential in reducing the content of noble metals in catalysts or even completely replacing noble metals. They are ideal in the tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83
Inventor 龚彩荣王晓飞原保平李亚利范国樑
Owner TIANJIN UNIV
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