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Preparation method of copper cerium catalyst with high dispersion of active species

A catalyst and highly dispersed technology, applied in the field of chemical materials, can solve the problems of highly dispersed active species and easy high-temperature agglomeration, and achieve the effects of orderly pores, large specific surface area, and reduced preparation costs

Inactive Publication Date: 2019-11-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a copper-cerium catalyst with highly dispersed active species, which can effectively solve the problem that the active species in the existing copper-cerium catalyst are difficult to be highly dispersed and easy to agglomerate at high temperature

Method used

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  • Preparation method of copper cerium catalyst with high dispersion of active species
  • Preparation method of copper cerium catalyst with high dispersion of active species
  • Preparation method of copper cerium catalyst with high dispersion of active species

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Using Cu-MOF as a precursor to support cerium ions

[0025] Weigh 0.875 g of Cu(NO 3 ) 2 •6H 2 O was added to 12 ml of deionized water, and stirred to obtain solution A; 0.42 g of tricarboxylic acid organic ligand was dissolved in 12 ml of ethanol, and stirred to obtain solution B. Mix solution A and solution B, stir at room temperature for 30 min, place in a 40 ml polytetrafluoroethylene stainless steel reactor lining, keep the temperature in an oven at 120°C for 12 h, cool naturally to room temperature, take out the product, and filter After washing several times with ethanol and distilled water, blue powdery crystal Cu-MOF was obtained. 1.0 g Cu-MOF was impregnated into 7.0 g Ce(NO 3 ) 3 •6H 2 O solution, stood at room temperature for 24 h, and dried overnight at 100 °C. Finally, the copper-cerium catalyst a with a copper content of 5% was obtained by calcination at 800 °C for 6 h in a muffle furnace. By changing the amount of Cu-MOF to 0.4g and 2....

Embodiment 2

[0026] Example 2: Using Ce-MOF as a precursor to support copper ions

[0027] Weigh 0.05 g of Ce(NO 3 ) 3 •6H 2 O was added to 1 ml deionized water and stirred to obtain solution A; 0.105 g of 1,3,5-H 3 The BTC ligand was dissolved in water-ethanol solution (40 mL, v / v=1:1), and stirred to obtain solution B. Solution A and solution B were mixed, stirred at room temperature for 30 min, and then placed in a beaker. The solid was filtered, washed with ethanol and distilled water several times, and dried in air at room temperature to obtain the white product Ce-MOF. 1.0 g of Ce-MOF was impregnated with 0.23 g Cu(NO 3 ) 2 •6H 2 O aqueous solution, after standing at room temperature for 24 h, dried at 120 °C overnight. Finally, the obtained copper-cerium catalyst b was calcined in a muffle furnace at ℃ for 6 h.

Embodiment 3

[0028] Example 3: Using CuCe-MOF as a precursor

[0029] Weigh 0.13 g of CuCl 2 • 2H 2 O and 0.0745 g of CeCl 3 •7H 2 O was added to 5 ml of deionized water and stirred to obtain a light green solution A; 0.2 g of methylenediacetic acid ligand was dissolved in 5 ml of deionized water, and the pH was adjusted to neutral with ammonia water to obtain a colorless and transparent solution B. Mix solution A and solution B to obtain a blue solution, adjust the pH to 5-6 with ammonia water, stir at room temperature for 30 min, place in an oven at 60 °C for 48 h, cool to room temperature naturally, take out the product, filter and wash with ethanol Washed several times with distilled water to obtain blue crystal CuCe-MOF. Finally, the blue crystal was calcined in a muffle furnace at 400 °C for 6 h to obtain copper-cerium catalyst c.

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Abstract

The invention discloses a preparation method of a copper cerium catalyst with high dispersion of active species. The preparation method of the copper cerium catalyst with high dispersion of the activespecies comprises the steps that S1, metal copper salt or cerium salt is dispersed in water, further a dispersed organic ligand is added, and the mixture is stirred uniformly; and the mixed solutionis placed in an oven for crystallization, hydrothermal synthesis is carried out to obtain a copper metal organic framework compound or a cerium metal organic framework compound or a copper cerium bimetallic organic framework compound; S2, when the synthesis product is a copper metal organic framework compound, the copper metal organic framework compound is loaded with cerium ions by an equal volume impregnation method; when the synthesis product is the cerium metal organic framework compound, the cerium metal organic framework compound is loaded with copper ions by an impregnation method to obtain a catalyst precursor; S3, and the obtained catalyst precursor is dried and placed in a muffle furnace for calcination to obtain the copper cerium catalyst. The synthesized copper cerium catalysthas the following advantages that (1) a large specific surface area is achieved, so that efficient conversion of CO is facilitated; (2) orderly pores are achieved, and gas mass transfer during the reaction is accelerated; and (3) better CO-PROX effect is achieved, complete conversion of CO can be achieved at 100 DEG C with good selectivity.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a method for preparing a copper-cerium catalyst with highly dispersed active species. Background technique [0002] As a clean and efficient energy conversion device, Proton Exchange Membrane Fuel Cell (PEMFC) can convert chemical energy into electrical energy without pollution and effectively, so it has attracted widespread attention. The raw material gas of proton exchange membrane fuel cell mainly comes from the hydrogen prepared by natural gas steam reforming, methanol steam reforming and water gas reforming, but a small amount of carbon monoxide gas will inevitably be mixed in the preparation process. Although the content is extremely low, it is harmful But huge. According to literature reports, the carbon monoxide concentration is below 10ppm (parts permillion) to ensure the safety of metal platinum electrodes in PEMFC. Even for ruthenium-platinum alloy electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J27/24B01J35/10B01D53/86B01D53/62
CPCB01J23/83B01J27/24B01J23/002B01D53/864B01D2257/502B01J35/60B01J35/61Y02A50/20
Inventor 陈超胡卓钟贻成汪淑华赵丹丁顺民肖卫明邓圣军
Owner NANCHANG UNIV
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