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Preparation of Co3O4 / CeO2 composite oxide and catalytic application

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem of large influence on catalytic activity

Inactive Publication Date: 2014-04-30
邵建军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ratio of cobalt to cerium has a great influence on the catalytic activity of the catalyst [Applied Catalysis B 66 (2006) 217–227, Appl. Catal. B 128 (2012) 21–30], research on the optimal ratio of cobalt cerium composite oxide catalyst Low-temperature oxidation of carbon monoxide remains a challenging subject

Method used

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  • Preparation of Co3O4 / CeO2 composite oxide and catalytic application

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Experimental program
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Effect test

Embodiment 1

[0010] Co with an atomic ratio of cobalt to cerium of 19 to 1 3 o 4 / CeO 2 Preparation of composite oxides. Preparation of Co with an atomic ratio of cobalt to cerium of 19 to 1 by precipitation oxidation 3 o 4 / CeO 2 composite oxide catalyst. Under stirring conditions at 333K, 1 mol / L Co(NO 3 ) 2 ·6H 2 O and 1 mol / L Ce(NO 3 ) 3 ·6H 2 O aqueous solution was slowly dropped into 0.2 mol / L sodium carbonate aqueous solution in proportion, the pH value was adjusted to 10.0 with 0.2 mol / L NaOH, and after aging at this temperature for 4 h, it was filtered and washed with deionized water. Then, the obtained precipitate was mixed again with deionized water and stirred, and an appropriate amount of H 2 o 2 (30%). After aging for 1 h, it was filtered and washed with deionized water again, dried at 383 K for 12 h, and calcined at 538 K for 4 h.

Embodiment 2

[0012] Co with an atomic ratio of cobalt to cerium of 19 to 1 3 o 4 / CeO 2 Test of performance of composite oxide catalysts in catalytic oxidation reaction of carbon monoxide. The activity test of the catalyst was carried out in a miniature fixed-bed quartz tube reactor at atmospheric pressure. The composite oxide powder was pressed into tablets, crushed and sieved to 40-60 mesh, and 200 mg was packed in a Ф=6 mm quartz reaction tube. Reagent gas CO / O 2 / He=1 % / 21 % / He, the total gas flow rate is 50 ml / min. The low temperature reaction is to immerse the U-shaped reactor in the liquid nitrogen container, and control the reaction temperature by adjusting the distance between the catalyst and the liquid nitrogen surface. The humidity condition was achieved by bubbling the reaction gas through a 298 K constant temperature water bath (moisture content was 3.1 vol%). Before the reaction, the catalyst was pretreated in air at 538 K for 1 h. The gas at the outlet of the reactor...

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Abstract

The invention discloses preparation of Co3O4 / CeO2 composite oxide and catalytic application in low-temperature oxidation of carbon monoxide. The atomic ratio of Co to Ce in the Co3O4 / CeO2 composite oxide is 19 / 1. The Co3O4 / CeO2 composite oxide has a strong oxidation function, at a lower temperature (196K), the conversion rate of the catalyst for CO oxidation is 99%, and can be continuously maintained for more than 480min, and when a reaction gas contains 3.1vol.% of moisture, and the temperature is 383K, the CO conversion rate still maintains at 81% after 2580min of reaction.

Description

technical field [0001] The present invention relates to a Co 3 o 4 / CeO 2 Preparation technology of composite oxides and catalytic application of such oxides in low-temperature oxidation of carbon monoxide. Background technique [0002] Low-temperature oxidation of carbon monoxide is widely used in meteorological monitoring, gas masks, and the removal of trace carbon monoxide in closed environments such as spacecraft and submarines. Studies have found that some transition metal oxides can also achieve low-temperature oxidation of carbon monoxide. Cunningham et al [Catal. Lett. 25(1994) 257] reported Co 3 o 4 Complete conversion of carbon monoxide can be achieved at a low temperature of 197 K under dry conditions. Thorm?hlen et al [J.Catal.188 (1999) 300] reported that Co 3 o 4 Loaded on Al 2 o 3 At a temperature of 210 K, the conversion of carbon monoxide can reach 50%. The existence of water in practical application and feed gas is inevitable, because Co 3 o 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/62
CPCY02A50/20Y02C20/20
Inventor 邵建军鞠晓春李家波周学滨张永坤陈高杰赵鹏远
Owner 邵建军
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