Supported palladium catalyst using palladium oxide as support and preparation method thereof

A technology of supported palladium and cerium oxide, which is applied in the field of supported palladium catalyst and its preparation, can solve the problems of inconsistent particle size, failure to obtain catalytic effect, uneven dispersion of Pd particles, etc., and achieve improved utilization rate and good low-temperature oxidation effect of effect

Active Publication Date: 2017-12-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current catalysts obtained by the traditional impregnation method or co-precipitation method, Pd and CeO 2 The interaction effect of Pd is not obvious, the dispersion of Pd particles is not uniform, and the particle size is inconsistent
Failed to achieve good catalytic effect

Method used

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  • Supported palladium catalyst using palladium oxide as support and preparation method thereof
  • Supported palladium catalyst using palladium oxide as support and preparation method thereof
  • Supported palladium catalyst using palladium oxide as support and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of palladium solution: the measured concentration is 1.88×10 ‐7 mol / L palladium nitrate solution 0.5ml, dilute to 32ml with deionized water, stir evenly while adding, keep the rotation speed at a low speed to ensure even stirring. Take by weighing 19.6g sodium hydroxide solid, pour into it slowly, increase stirring speed, guarantee to dissolve rapidly. After complete dissolution, a yellow viscous palladium solution was obtained, and the temperature was lowered to 20°C.

[0026] (2) Preparation of cerium oxide colloid: Measure 5ml of cerium nitrate solution with a concentration of 1.16mol / L, dilute it to 32ml with deionized water, stir evenly while adding, and keep the rotating speed at a low speed to ensure uniform stirring. Take by weighing 19.6g sodium hydroxide solid, slowly pour into wherein to form precipitation. Cool down and stir for 30 min to form a uniform white colloidal solution and keep the temperature at 20°C.

[0027](3) Preparation of P...

Embodiment 2～4

[0029] The preparation method of Examples 2 to 4 is the same as that of Example 1, except that the reaction temperature during step (3) loading is changed to 40°C, 60°C, and 80°C respectively.

Embodiment 5

[0031] (1) Preparation of palladium solution: the measured concentration is 3.76×10 ‐7 mol / L palladium nitrate solution 0.5ml, dilute to 32ml with deionized water, stir evenly while adding, keep the rotation speed at a low speed to ensure even stirring. Weigh 2.08g of sodium hydroxide solid, slowly pour it into it, and increase the stirring speed to ensure rapid dissolution. After complete dissolution, a wine-red palladium solution was obtained, and the temperature was lowered to 20°C.

[0032] (2) Preparation of cerium oxide colloid: Measure 5ml of cerium nitrate solution with a concentration of 1.16mol / L, dilute it to 32ml with deionized water, stir evenly while adding, and keep the rotating speed at a low speed to ensure uniform stirring. Weigh 2.08g of sodium hydroxide solid, slowly pour it into it to form a precipitate. Cool down and stir for 30 min to form a uniform white colloidal solution and keep the temperature at 20°C.

[0033] (3) Preparation of Pd-loaded cerium...

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Abstract

The invention relates to a supported palladium catalyst using palladium oxide as a support and a preparation method thereof. A solid base and a metal salt are subjected to mixing reaction to obtain stable palladium oxide colloid and palladium solution; the palladium solution and the palladium oxide colloid are mixed, to be specific, the palladium solution and the palladium oxide colloid are mixed well for reacting and supporting; after several hours, centrifugal washing, lyophilizing, high-temperature calcining and low-temperature reduction are performed to obtain the finished catalyst. The support material, palladium, for the catalyst is evenly distributed on the support palladium oxide; therefore, the catalyst has good low-temperature oxidizing performance, and can fully oxidize carbon monoxide at 60 DEG C. In addition, by adjusting the concentration of the solid base dissolving in the solution and the temperature of mixing, the temperature for the catalyst to fully oxidize carbon monoxide is controllably variable in the range of 60 DEG C to 150 DEG C. Therefore, the catalyst is more suitable for different operating conditions and window temperatures.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a supported palladium catalyst with cerium oxide as a carrier and a preparation method thereof. The catalyst can remove carbon monoxide under low temperature conditions. Background technique [0002] It is well known that carbon monoxide is a flammable and poisonous gas. With the current development of the chemical industry, the combustion of fossil fuels and the emission of motor vehicle exhaust. The large amount of carbon monoxide produced has caused serious environmental problems. At the same time, the low-temperature elimination of carbon monoxide has important applications in many fields. For example, the purification of carbon dioxide in carbon dioxide lasers to remove carbon monoxide, trace carbon monoxide detectors, respiratory gas purification devices or the elimination of trace carbon monoxide in closed environments (aircraft, submarines, etc.) and other conditions. In these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63
CPCB01J35/006B01J35/0066B01J37/036B01J37/18
Inventor 程党国夏阳陈丰秋詹晓力
Owner ZHEJIANG UNIV
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