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Preparation method of Pd-Cu/modified attapulgite clay catalyst

A technology of attapulgite clay and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor stability, low initial activity, etc. Good stability, high initial activity, cheap and easy-to-obtain carrier

Inactive Publication Date: 2015-06-03
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our research group (Wang Yongzhao, Zhang Zhuo, Zhao Yongxiang, Li Fengmei. Industrial Catalysis, 2011, 19:74-79.) used natural attapulgite clay as a carrier to prepare supported Pd and Cu catalysts at room temperature. However, there are still problems such as low initial activity and poor stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 0.30g of sodium hexametaphosphate, 0.10g of polyacrylic acid, 200ml of water and 10ml of ethanol to make a solution, add 10g of attapulgite clay, stir well at room temperature, ultrasonicate the formed suspension at 25°C for 20min, and take it after standing still. The suspension in the upper layer was treated in a water bath at 60°C for 6h, then centrifuged, and the slurry in the lower layer was dried at 120°C for 16h to obtain the modified attapulgite clay carrier; 1.72g Cu(NO 3 ) 2 ·3H 2 O, 0.61g CuCl 2 2H 2 O, 1.00g urea, 2.40ml PdCl 2 (Pd ion concentration 9.5mg / mL) was made into a solution, impregnated on 5g of modified attapulgite clay carrier, aged for 3h, dried at 80°C for 15h, and then calcined at 300°C for 1.5h to prepare palladium supported on modified attapulgite clay Copper catalyst, after sieving, take particles with a particle size between 40-60 mesh for future use. Among them, the Cu loading is 12wt%, and the Pd loading is 0.4wt%.

[0022] Ta...

Embodiment 2

[0024] The solvent for preparing the dispersant solution in Example 1 was replaced with 200ml of water and 5ml of ethanol, the ultrasonic temperature of the suspension was changed to 60°C, and the water bath treatment time was extended to 8h, and the modified attapulgite clay was prepared by the same method. Copper catalyst, Cu loading 12wt%, Pd loading 0.4wt%.

[0025] Using the evaluation conditions of Example 1, under the above evaluation conditions, the initial CO conversion rate reaches 100%, and the complete conversion of CO is maintained for at least 320 minutes.

Embodiment 3

[0027] The dispersant in Example 1 was changed to 0.40 g of sodium hexametaphosphate, and the modified attapulgite clay-supported palladium-copper catalyst was prepared by the same method, with a Cu loading of 12 wt % and a Pd loading of 0.4 wt %.

[0028] Using the evaluation conditions of Example 1, under the above evaluation conditions, the initial CO conversion rate reaches 100%, and the complete conversion of CO is maintained for at least 210 minutes.

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Abstract

The invention provides a preparation method of a Pd-Cu / modified attapulgite clay catalyst, which comprises the steps of preparing a dispersant solution, and adding attapulgite clay; stirring and performing ultrasonic treatment on the formed suspension; standing and performing heat treatment on the upper-layer suspension; centrifuging and drying to obtain a modified carrier; preparing an aqueous solution of copper salt, palladium salt and urea, and impregnating the modified carrier; slowly drying and quickly roasting to obtain a finished product of the catalyst. The catalyst has high initial activity, good stability and relatively wide range of application conditions, and can perform effective catalytic oxidation of CO under the reaction conditions of reaction temperature of (-50)-100 DEG C, air speed of 2,500-10,000 / h, CO content of 10-10,000ppm and relative humidity of feed gas of 20-100%, and the deactivated catalyst can be regenerated. The preparation method of the catalyst provided by the invention has the advantages of simple process, easiness in operation, low cost and good application prospect.

Description

technical field [0001] The invention relates to a catalyst for low-temperature oxidation of carbon monoxide, in particular to a preparation method of a Pd-Cu / modified attapulgite clay catalyst. Background technique [0002] The CO low-temperature catalytic oxidation process involves the elimination of environmental pollution, air purification, CO 2 Gas purification in lasers, CO sensors, gas masks, and CO removal in closed systems. However, at low temperatures, especially in the presence of water vapor, many catalysts have disadvantages such as low activity and poor water resistance, which limit their use. Therefore, CO oxidation catalysts with high activity and high stability at low temperature in the presence of water vapor have become a research hotspot. [0003] It is well known that the supported Wacker catalyst (PdCl 2 -CuCl 2 ) has high catalytic activity for CO catalytic oxidation at low temperature, and the presence of trace water can promote the reaction. The C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/90B01D53/62
Inventor 王永钊赵永祥程慧敏张卓范莉渊
Owner SHANXI UNIV
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