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Mesoporous CuO/Ce0.8Zr0.2O2 catalyst preparation and use of same in oxidation of CO

A catalyst and mesoporous technology, which is applied in the field of inorganic nano-catalytic materials, can solve the problems of cumbersome process, unsatisfactory low-temperature oxidation activity of catalytic CO, high toxicity of raw materials, etc., and achieve simple preparation process and equipment, good industrial production prospects, large The effect of industrial application significance

Inactive Publication Date: 2007-11-14
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the published preparation methods and applications of cerium-zirconium composite oxides: CN 1349060A, CN 1263868A, CN1387943A, CN 1449863A, CN 1263868A, USP 6255242, USP 6133194, etc. can prepare products with certain oxygen storage capacity and thermal stability , but the resulting product has problems such as small specific surface area, high toxicity of raw materials, introduction of heteroatoms that can lead to a decrease in catalyst activity, long operating time, and cumbersome procedures.
Paper Catal.Commun.8(2007) 231-236 prepared CuO / Ce by citrate co-precipitation method 0.8 Zr 0.2 o 2 Catalysts whose specific surface area is lower than 31m 2 / g, non-porous, large crystal grains, and not very ideal for catalytic low-temperature oxidation of CO

Method used

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  • Mesoporous CuO/Ce0.8Zr0.2O2 catalyst preparation and use of same in oxidation of CO
  • Mesoporous CuO/Ce0.8Zr0.2O2 catalyst preparation and use of same in oxidation of CO
  • Mesoporous CuO/Ce0.8Zr0.2O2 catalyst preparation and use of same in oxidation of CO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, weigh 6 mmol of CTAB, dissolve it in 200 mL of deionized water, and disperse for 15 minutes. Add the calculated amount of Ce(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·5H 2 O (molar ratio 4:1), continue to stir for 30 minutes, add 0.2M NaOH solution to pH 10, stir the resulting suspension for 12 hours, age at 90°C for 3 hours, wash with hot water, suction filter, 110°C Drying for 6 hours and calcining at 400 °C for 4 hours prepared mesoporous Ce 0.8 Zr 0.2 o 2 The powder, its XRD, nitrogen adsorption and desorption analysis, and TEM analysis are shown in Figures 1, 3, and 4.

[0027] The activity evaluation of the catalyst is carried out in a fixed-bed continuous flow differential reactor. The reactor is a stainless steel tube with an inner diameter of 7mm, the catalyst loading is 200mg, the feed gas composition is air containing 10% CO (volume ratio), and the space velocity is 11000mlh -1 g -1 , CO and CO in the product gas after 15 minutes of rea...

Embodiment 2

[0029] At room temperature, weigh 6 mmol of CTAB, dissolve it in 200 mL of deionized water, and ultrasonically disperse for 15 minutes. Under vigorous stirring, a calculated amount of Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·5H 2 O (Ce, Zr molar ratio 4:1), continue to stir for 30 minutes, add 0.2M NaOH solution until the pH value is 10, stir the resulting suspension for 12 hours, age at 90°C for 3 hours, wash with hot water, and suction filter , dried at 110°C for 6 hours and calcined at 400°C for 4 hours to prepare mesoporous CuO / Ce 0.8 Zr 0.2 o 2 catalyst.

[0030] The activity evaluation of the catalyst is carried out in a fixed-bed continuous flow differential reactor. The reactor is a stainless steel tube with an inner diameter of 7mm, the catalyst loading is 200mg, the feed gas composition is air containing 10% CO (volume ratio), and the space velocity is 11000mlh -1 g -1 , CO and CO in the product gas after 15 minutes of reaction 2 The co...

Embodiment 3

[0032] Change the CuO mole percentage in Example 2 from 25% to 10%, and the others are the same as in Example 2. The catalytic activity results are shown in Figure 5.

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Abstract

The present invention relates to a preparation method of mesohole Ce 0.8 Zr 0.2 O2 powder body with nano structure and CuO / Ce0.8 Zr0.2 O2 catalyst and its application for catalyzing CO low-temperature oxidation. It is characterized by that it uses cationic surfactant cetyltrimethyl ammonium bromide (CTAB) as template agent, and adopts a simple one-step process to prepare mesohole nano Ce 0.8 Zr 0.2 O2 powder body which can be used a high-activity catalyst carrier and CuO / Ce 0.8 Zr 0.2 O2 catalyst.

Description

technical field [0001] The present invention relates to a kind of mesoporous Ce with nanostructure 0.8 Zr 0.2 o 2 Catalytic materials and CuO / Ce 0.8 Zr 0.2 o 2 The preparation of the catalyst and its application to catalyze the low-temperature oxidation of CO belong to the field of inorganic nano-catalysis materials. Background technique [0002] Low-temperature oxidation of CO in air purifiers, CO gas sensors, closed-cycle CO 2 Lasers, tobacco harm reduction, CO gas masks, CO removal in closed systems, and environmental pollution control, especially automobile exhaust control, play an important role; at the same time, in fuel cell research, partial oxidation of low-carbon alcohols and hydrocarbons or water The hydrogen-rich gas produced by steam reforming often contains about 0.5-3% (mol) of CO. The presence of CO will not only cause fuel cell poisoning but also interact with H 2 Competing for the reaction with oxygen leads to a significant reduction in the efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83C01B31/20C01B32/50
Inventor 袁忠勇曹建亮
Owner NANKAI UNIV
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