Preparation and catalytic application of PtMnO2/Co3O4/CeO2

A catalyst and a technology of catalytic activity, applied in the field of PtMnO2/Co3O4/CeO2 preparation and catalytic application, can solve the problem of low conversion rate and so on

Inactive Publication Date: 2015-12-16
邵建军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, in the catalytic performance of a series of transition metal oxide catalysts for the complete oxidation of formaldehyde, MnO 2 It is a better catalyst, it can react with formaldehyde to release carbon dioxide at room temperature, but the conversion rate is not high

Method used

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  • Preparation and catalytic application of PtMnO2/Co3O4/CeO2
  • Preparation and catalytic application of PtMnO2/Co3O4/CeO2

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Embodiment 1

[0011] MnO with an atomic ratio of cobalt to manganese and cerium of 19:1:1 2 / Co 3 o 4 / CeO 2 Preparation of composite oxides. Preparation of MnO with an atomic ratio of cobalt, manganese and cerium of 38 to 1 to 1 by precipitation oxidation 2 / Co 3 o 4 / CeO 2 composite oxide catalyst. Under 333K and stirring conditions, 1mol / L Co(NO 3 ) 2 6H 2 O, 1mol / L Mn(NO 3 ) 2 6H 2 O and 1mol / 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 hour, filter and wash again with deionized water, dry at 383K for 12 hours, and bake at 538K for 4 hours.

Embodiment 2

[0013] PtMnO 2 / Co 3 o 4 / CeO 2 Catalyst preparation. The MnO prepared by the above method 2 / Co 3 o 4 / CeO 2 The powder is suspended in an aqueous solution, and dinitrosodiammine platinum is added under stirring, then evaporated to dryness at 323K, dried at 383K for 12 hours, and calcined at 533 for 4 hours to obtain PtMnO 2 / Co 3 o 4 / CeO 2 catalyst.

Embodiment 3

[0015] The test of the performance of the catalyst for the 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 is pressed into tablets, crushed and sieved to 40-60 mesh, and 200 mg is packed in a Ф=6mm quartz reaction tube. 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 is achieved by bubbling the reaction gas through a 298K constant temperature water bath (moisture content is 3.1vol%). Before the reaction, the catalyst was pretreated in air at 538K for 1 h. The gas at the outlet of the reactor was analyzed on-line by a HP-6890 gas chromatograph, and a nickel converter was installed in front of the FID detector, and CO and CO were separated in a ...

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Abstract

Disclosed are preparation of a catalyst of PtMnO2/Co3O4/CeO2 and a catalytic application of the catalyst to low-temperature oxidation of carbon monoxide and formaldehyde. The atomic ratio of Co to Mn to Ce in a composite oxide of MnO2/Co3O4/CeO2 is 38/1/1. The catalyst of PtMnO2/Co3O4/CeO2 related in the invention has preferable catalytic activity and has a conversion rate of CO oxidation of 99% at a relatively low temperature of 196K, wherein the conversion rate can continuously maintain for more than 480 min. Complete oxidation of formaldehyde can be realized at a room temperature.

Description

technical field [0001] The present invention relates to a kind of PtMnO 2 / Co 3 o 4 / CeO 2 Preparation technology of composite oxide and catalytic application of this oxide in low temperature oxidation of carbon monoxide and formaldehyde. 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 Under dry conditions, complete conversion of carbon monoxide can be achieved at a low temperature of 197K. 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 210K, the conversion rate of carbon monoxide can reach 50%. The existence of water in practical application and feed ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/62B01D53/72
CPCY02A50/20
Inventor 邵建军焦安龙鞠晓春李家波侯代文
Owner 邵建军
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