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Preparation method of mesoporous supported CuO-LaCoO3 catalyst

A supported catalyst, mesoporous technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of limiting perovskite, complex composition, poor characteristics, etc. Good low-temperature catalytic activity and thermal stability, simple and easy-to-obtain raw materials, and low-cost preparation effects

Inactive Publication Date: 2017-09-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the field of automobile exhaust redox catalysis, several La-Co-O-based perovskites have relatively good effects and have been studied more, but due to their poor low-temperature ignition characteristics, low specific surface area and complex composition, it is difficult to prepare them in batches. Limits the advantages and practical application of perovskite materials

Method used

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  • Preparation method of mesoporous supported CuO-LaCoO3 catalyst
  • Preparation method of mesoporous supported CuO-LaCoO3 catalyst
  • Preparation method of mesoporous supported CuO-LaCoO3 catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of Mesoporous LaCoO with Large Specific Surface Area 3 Catalyst, it comprises the steps:

[0036] Preparation of template KIT-6: using P123 as template, n-butanol as silicon source, and tetraethyl silicate as silicon source, prepared by solvothermal method; the specific process is as follows: 6g of P123 and 6g of n-butanol were dissolved in 217g of deionized water and 11.4 In hydrochloric acid with a concentration of 37%, stir at 38°C for 1h until completely dissolved, then add 12.9g of tetraethyl silicate and continue to stir for 24h; transfer the resulting solution to a reaction kettle, and conduct a hydrothermal reaction at 100°C for 24h; cool the reaction kettle to room temperature , take out the lining, filter, wash, and dry to obtain a white powder; calcinate the obtained powder in a muffle furnace at 550°C for 5 hours to obtain the KIT-6 template. The TEM image of the prepared template KIT-6 is as follows Figure 4 It can be clearly seen from the fi...

Embodiment 2

[0044] Preparation of Mesoporous LaCoO with Large Specific Surface Area 3 Catalyst, it comprises the steps:

[0045] Weigh 8mmol of lanthanum nitrate and cobalt nitrate and dissolve them in 80ml of ethanol solution (the volume ratio of absolute ethanol to deionized water is 3:1), weigh 8mmol of citric acid monohydrate as a chelating agent and add it to the precursor, and stir overnight at room temperature ;

[0046] Slowly add 16mmol of the prepared template while stirring, heat and stir until viscous;

[0047] Transfer the wet gel to an oven to dry to obtain a dry gel, and bake it in an electric furnace for 2 hours to remove citric acid to obtain a black fluffy solid;

[0048] The black fluffy solid was calcined in a muffle furnace at a heating rate of 2 °C / min at 700 °C for 6 h to obtain template-containing LaCoO 3 black powder;

[0049] Use a sodium hydroxide solution with a concentration of 2mol / L, stir at 40°C for 12h to wash away SiO 2 , namely the mesoporous perovs...

Embodiment 3

[0052] Preparation of Mesoporous LaCoO with Large Specific Surface Area 3 Catalyst, it comprises the steps:

[0053] Weigh 8mmol of lanthanum nitrate and cobalt nitrate and dissolve them in 80ml of absolute ethanol, weigh 8mmol of citric acid monohydrate as a chelating agent and add them to the precursor, and stir overnight at room temperature;

[0054] Slowly add 16mmol of the prepared template while stirring, heat and stir until viscous;

[0055] Transfer the wet gel to an oven to dry to obtain a dry gel, and bake it in an electric furnace for 2 hours to remove citric acid to obtain a black fluffy solid;

[0056] The black fluffy solid was calcined in a muffle furnace at a heating rate of 2 °C / min at 700 °C for 6 h to obtain template-containing LaCoO 3 black powder;

[0057] Use a sodium hydroxide solution with a concentration of 2mol / L, stir at 40°C for 12h to wash away SiO 2 , namely the mesoporous perovskite LaCoO 3 , remember LaCoO 3 -C 1 h 0 .

[0058] The resu...

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Abstract

The invention discloses a preparation method of a mesoporous supported CuO-LaCoO3 catalyst. The preparation method includes the steps: soaking mesoporous LaCoO3 into copper nitrate solution; calcining the mesoporous LaCoO3 soaking Cu ions for 4-6h in a muffle furnace at the temperature ranging from 400 DEG C to 600 DEG C to obtain the CuO-LaCoO3 catalyst. According to the method, needed raw materials are simple and easy to acquire, the mesoporous supported catalyst with the cost lower than that of a precious metal catalyst is prepared, components in the obtained CuO-LaCoO3 catalyst are uniformly dispersed and mutually acted, and the catalyst has good low-temperature catalytic activity and hot stability for CO in exhaust and can be used for the field of automobile exhaust catalysts. A support of CuO provides more active oxygen for an original catalyst, so that the low-temperature catalytic activity of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a mesoporous supported catalyst CuO-LaCoO 3 method of preparation. Background technique [0002] Rare earth perovskite catalyst ABO 3 It is a multi-component catalyst. Compared with traditional noble metal (Pt, Ru, Pd) catalysts, perovskite materials have the characteristics of low price, stable structure, good catalytic activity and high temperature thermodynamic stability. They are widely used in photocatalysis, Thermal catalysis and other catalytic fields. Its mechanism for catalyzing CO in automobile exhaust is: B ions adsorb gaseous oxygen, adsorbed CO and CO 2 On lattice oxygen, the catalytic oxidation reaction proceeds through CO adsorbed state and gaseous adsorbed oxygen, and finally oxidizes CO to CO 2 . [0003] In the field of automobile exhaust redox catalysis, several La-Co-O-based perovskites have relatively good effects and have been studied more, but due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/94B01D53/86B01D53/62
CPCB01D53/864B01D53/94B01J23/002B01J23/83B01J2523/00B01J35/61B01J2523/17B01J2523/3706B01J2523/845
Inventor 黄学辉窦世静商晓辉李正晔牛鹏举杨银波
Owner WUHAN UNIV OF TECH
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