CuO loaded CeO2 catalyst for CO preferential oxidation

A catalyst and carrier technology, applied in the field of CuO supported CeO2 catalyst, can solve the problems of high price, catalyst deactivation, large influence on catalyst activity, etc., achieve good CO conversion and selectivity, simple and easy preparation process, and temperature window. wide effect

Inactive Publication Date: 2012-04-11
INNER MONGOLIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key is to find a high-efficiency catalyst for preferential oxidation of CO. At present, the catalysts used for the preferential oxidation of CO in hydrogen-rich mainly include: (1) supported Au catalysts. Most of these catalysts can obtain better oxidation at lower temperatures. However, due to the chemical inertness of Au, Au catalysts can only obtain better catalytic activity in the case of high dispersion and small Au particle size, so the method of using supported Au catalysts to remove CO has problems due to particle growth or The problem of catalyst deactivation caused by sintering makes it difficult to achieve satisfactory CO selectivity; (2) noble metal catalysts, that is, the use of supported Al 2 o 3 , CeO 2 , MgO, CeO 2 -ZrO 2 Noble metal catalysts such as Pt, Pd, Ru, Rh, etc., but the use of noble metal catalysts is expensive and the catalyst activity is affected by H 2 O and CO 2 Disadvantages such as greater influence and higher optimal temperature of the catalyst reaction; (3) supported Cu catalysts, currently more researches and better effects use CuO to support CeO 2 Catalyst method, from an economic point of view, copper cerium combination catalyst has a good prospect, Avgouropoulos found that the traditional CuO / CeO 2 The catalyst system has better reactivity than the noble metal Pt / lnordenite catalyst, such as 95% conversion and 60% selectivity at 200 ° C. Therefore, it will be important to study transition group non-noble metals and rare earth element-based catalysts. A feasible research direction, but when the catalyst with Cu as the active component is used for the preferential oxidation of CO, the water in the hydrogen-rich gas has a great negative impact on the preferential oxidation of CO, which is a major problem with the use of Cu catalysts

Method used

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  • CuO loaded CeO2 catalyst for CO preferential oxidation
  • CuO loaded CeO2 catalyst for CO preferential oxidation
  • CuO loaded CeO2 catalyst for CO preferential oxidation

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Experimental program
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Embodiment 1

[0027] A CuO-supported CeO for preferential oxidation of CO 2 The preparation method of catalyst, its step comprises:

[0028] 1) Take 0.02mol Cu(NO 3 ) 2 Solution 600ml, spare;

[0029] 2) The configuration of the mixed solution of ammonia water and PEG: according to the Cu(NO 3 ) 2 The molar ratio of the solution is 8:1. Take 0.16mol of concentrated ammonia water, that is, 24.6ml, then add 24.6ml of deionized water according to the volume ratio of ammonia water to water is 1:1, and then add 3g of polyethylene glycol with Mw=6000 to the solution. Alcohol, sonicated until completely dissolved, made into a mixed solution, and set aside;

[0030] 3) the Cu(NO in step 1) 3 ) 2 The solution was heated to 30°C, and then the mixed solution in step 2) was added dropwise to the stirred Cu(NO 3 ) 2 in solution;

[0031] 4) After the dropwise addition, the Cu(NO 3 ) 2 The mixture was heated to 80°C and stirred for 12 hours at the same time, then stood at 20°C for 12 hours, f...

Embodiment 2

[0035] A CuO-supported CeO for the preferential oxidation of CO 2 The preparation method of catalyst, its step comprises:

[0036]1) Take 0.02mol Cu(NO 3 ) 2 Solution 600ml, spare;

[0037] 2) The configuration of the mixed solution of ammonia water and PEG: according to the Cu(NO 3 ) 2 The molar ratio of the solution is 8:1. Take 0.16mol of concentrated ammonia water, that is, 24.6ml, then add 24.6ml of deionized water according to the volume ratio of ammonia water to water is 1:1, and then add 5g of polyethylene glycol with Mw=6000 to the solution. Alcohol, sonicated until completely dissolved, made into a mixed solution, and set aside;

[0038] 3) the Cu(NO in step 1) 3 ) 3 The solution was heated to 30°C, and then the mixed solution in step 2) was added dropwise to the stirred Cu(NO 3 ) 2 in solution;

[0039] 4) After the dropwise addition, the Cu(NO 3 ) 2 The mixture was heated to 80°C and stirred for 12 hours at the same time, then stood at 20°C for 12 hours...

Embodiment 3

[0043] A CuO-supported CeO for the preferential oxidation of CO 2 The preparation method of catalyst, its step comprises:

[0044] 1) Take 0.02mol Cu(NO 3 ) 2 Solution 600ml, spare;

[0045] 2) The configuration of the mixed solution of ammonia water and PEG: according to the Cu(NO 3 ) 2 The molar ratio of the solution is 8:1. Take 0.16mol of concentrated ammonia water, that is, 24.6ml, and then add 24.6ml of deionized water according to the volume ratio of ammonia water to water is 1:1, and then add 6gMw=6000 polyethylene glycol to the solution. Alcohol, sonicated until completely dissolved, made into a mixed solution, and set aside;

[0046] 3) the Cu(NO in step 1) 3 ) 2 The solution was heated to 30°C, and then the mixed solution in step 2) was added dropwise to the stirred Cu(NO 3 ) 2 in solution;

[0047] 4) After the dropwise addition, the Cu(NO 3 ) 2 The mixture was heated to 80°C and stirred for 12 hours at the same time, then stood at 20°C for 12 hours, fi...

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Abstract

The invention discloses a CuO loaded CeO2 catalyst for CO preferential oxidation in hydrogen-rich gas and application thereof, especially a ballflower-shaped or petal-shaped CuO loaded CeO2 catalyst. The invention takes copper nitrate as raw material, prepares ballflower-shaped or petal-shaped CuO, and takes it as carrier to synthesize ballflower-shaped or petal-shaped CuO loaded CeO2 catalyst for CO preferential oxidation by isovolumetric dipping method. The preparation process of the catalyst is simple and feasible. The raw material cost is comparatively low. CO preferential oxidation rate and selectivity are high. Temperature window of CO complete conversion is wide.

Description

technical field [0001] The present invention relates to a kind of CeO 2 supported catalysts, especially involving a CuO-supported CeO for the preferential oxidation of CO 2 catalyst. Background technique [0002] Nowadays, the hydrogen-rich gas used as fuel cell raw material gas is obtained through the reforming of hydrocarbons and the reaction of water gas change. The hydrogen-rich gas mainly contains 45-75vol.% H 2 , 15-25vol.%CO 2 , 0.5-2vol.% CO and a small amount of water vapor, because CO can poison the Pt electrode of the fuel cell, it is necessary to remove CO in the hydrogen-rich gas, and the preferential oxidation of CO is currently the most effective way to remove CO in the hydrogen-rich gas, Therefore, the preferential oxidation of CO in hydrogen-rich gas is one of the key technologies for fuel cell raw gas preparation. The preferential oxidation of CO refers to adding a small amount of oxygen or air to the hydrogen-rich gas to preferentially oxidize CO under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C01B3/58
Inventor 曾尚红王艳苏海全刘科伟
Owner INNER MONGOLIA UNIVERSITY
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