Preparation for Au-PtMnO2Co3O4CeO2 catalyst and catalytic application

A catalyst, catalytic oxidation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as low conversion rate

Inactive Publication Date: 2016-01-06
邵建军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After research, in the catalytic performance of a series of transition metal oxide catalysts for the complete oxidation of formaldehyde, ...

Method used

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  • Preparation for Au-PtMnO2Co3O4CeO2 catalyst and catalytic application
  • Preparation for Au-PtMnO2Co3O4CeO2 catalyst and catalytic application

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Embodiment 1

[0014] MnO with an atomic ratio of Co to Mn and Ce 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 19 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, 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 1h, filter and wash again with deionized water, dry at 383K for 12h, and bake at 538K for 4h.

Embodiment 2

[0016] Au-PtMnO 2 co 3 o 4 CeO 2 Catalyst preparation. Selected prepared MnO2Co 3 o 4 / CeO 2 Composite oxide is used as the carrier, gold is used as the active component, and the method of deposition and precipitation is adopted. According to gold, platinum loading MnO 2 co 3 o 4 CeO 2 The mass of composite oxides is 2% and 1% of the feed ratio to measure HAuCl 4 4H 2 O and H 2 PtCl 6 ·6H 2 O solution and adjusted to the appropriate concentration. With 0.1mol / L Na 2 CO 3 The solution was HAuCl 4 4H 2 O solution and Co 3 o 4 / CeO 2 Adjust the pH of the composite oxide suspension to an appropriate value, and then mix the HAuCl 4 4H 2 O and H 2 PtCl 6 ·6H 2 O solution was slowly dropped into MnO2Co 3 o 4 / CeO 2 complex oxide suspension. After aging at this temperature for 4 hours, it was filtered and washed with deionized water, dried at 353K for 24 hours, and then calcined at 443K for 4 hours under flowing air.

Embodiment 3

[0018] Au-PtMnO 2 co 3 o 4 CeO 2 Catalyst carbon monoxide and formaldehyde catalytic oxidation reaction performance test. The activity test of the catalyst was carried out in a miniature fixed-bed quartz tube reactor at atmospheric pressure. The catalyst powder is pressed into tablets, crushed and sieved to 40-60 mesh, and 200 mg is packed in a quartz reaction tube with Ф=6mm. 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 online with 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 hydrogen atmosphere. 2 Quantitatively converted to CH 4 .

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Abstract

The invention relates to preparation for an Au-PtMnO2Co3O4CeO2 catalyst and catalytic application. The catalyst is characterized in that the mass percentages of Au and Pt in the catalyst are 2% and 1% of MnO2Co3O4CeO2, respectively, and the atomic ratio of Co, Mn and Ce in the MnO2Co3O4CeO2 composite oxide is 19/1/1. The moisture resisting property of the Au-PtMnO2Co3O4CeO2 catalyst is improved, the carbon monoxide oxidative activity of the catalyst in a normal temperature moisture environment can be further improved, and the catalyst can be used for completely oxidizing formaldehyde under a room temperature condition.

Description

technical field [0001] The present invention relates to a kind of Au-PtMnO 2 co 3 o 4 CeO 2 Catalyst preparation technology, and the catalytic application of this catalyst in the oxidation of carbon monoxide and formaldehyde in normal temperature and humidity environment. Background technique [0002] Low-temperature oxidation of carbon monoxide is widely used in environmental pollution control, gas masks, and the removal of trace carbon monoxide in closed environments such as spacecraft and submarines. The cobalt-cerium composite oxide catalyst exhibits good carbon monoxide oxidation activity and can achieve complete oxidation of CO at a temperature of 196K. However, due to the influence of moisture, the continuous accumulation of carbonate-like species on the surface of the catalyst makes the catalyst gradually lose its activity [Acta Catalytica Sinica 272006] 937]. The addition of gold can improve the moisture resistance of the catalyst, but the presence of moisture ...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01D53/86B01D53/62B01D53/72
CPCY02A50/20
Inventor 邵建军焦安龙鞠晓春张永坤周学滨
Owner 邵建军
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