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A kind of nano-palladium catalyst supported by composite carrier and its preparation method and application in CO oxidation

A composite carrier and nano-palladium technology, which is applied in the direction of catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the problem of complex stable catalyst methods, long preparation cycles, cumbersome processes, etc. problem, to achieve excellent CO low-temperature oxidation elimination performance, improve surface group characteristics, and simple preparation method

Active Publication Date: 2021-09-28
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of stabilizing the catalyst is often more complicated, such as the encapsulation or template method, the preparation cycle is longer, and the process is more cumbersome

Method used

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  • A kind of nano-palladium catalyst supported by composite carrier and its preparation method and application in CO oxidation
  • A kind of nano-palladium catalyst supported by composite carrier and its preparation method and application in CO oxidation

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preparation example Construction

[0015] In order to achieve the above object, the invention provides a kind of preparation method of the nano-palladium catalyst supported by composite carrier, and described preparation method comprises the following steps: (1) take Al 2 o 3 Mix with water, add metal halides for ultrasonic dispersion, then add cellulose, and ultrasonically disperse to obtain a mixed solution; (2) Add carbonate solution to the mixed solution in step (1), mix, crystallize and dry to obtain composite carrier; (3) immersing the composite carrier in step (2) in palladium salt solution, adjusting the pH of the solution to 7-10, adding borohydride salt, mixing and drying.

[0016] Through the above technical scheme, the present invention implants metal halides into the carrier Al by using the co-precipitation method 2 o 3 structure, effectively changing the Al 2 o 3 and the mode of action of metal oxides to activate the electronic activity of the carrier; (2) by means of cellulose to compound Al ...

Embodiment 1

[0043] Weigh 1.7g of sodium carbonate and dissolve it completely in 15g of water to obtain a sodium carbonate solution for subsequent use.

[0044] Weigh 16.5g acidic Al 2 o 3 (commercial, 100-200 mesh) mixed with 16.5g water and placed in a reaction kettle, then add 3.8g nickel chloride, ultrasonically disperse for 10min, then add 0.4g cellulose, after fully ultrasonically dispersed, then gradually add the above carbonic acid Sodium solution, fully stirred evenly, crystallized at 80°C for 10h, then washed with water until neutral, dried and set aside to obtain nickel-doped Al 2 o 3 The composite carrier, the molar ratio of Al and Ni is 10:1, denoted as A.

[0045] Weigh 10g of the above Al 2 o 3 The composite carrier is impregnated in 17mL palladium concentration is 10mg / ml in the palladium chloride solution (that is to control the loading of Pd in ​​the catalyst after drying is 1%), adjust the pH of the solution to 8, add 0.8g sodium borohydride, cover Seal it, stir at...

Embodiment 2

[0047] The implementation steps and conditions are the same as in Example 1, except that the addition of nickel chloride is adjusted, that is, 12.5g of nickel chloride is added, that is, the molar ratio of Al and Ni is adjusted to 3:1, which is recorded as B to obtain a 1% Pd / B-C catalyst, Recorded as Cat 2.

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Abstract

The invention discloses a nano-palladium catalyst supported by a composite carrier and its preparation method and application. The preparation method comprises the following steps: (1) taking Al 2 o 3 Mix with water, add metal halides for ultrasonic dispersion, then add cellulose, and ultrasonically disperse to obtain a mixed solution; (2) Add carbonate solution to the mixed solution in step (1), mix, crystallize and dry to obtain Composite carrier; (3) immerse the composite carrier in step (2) in palladium salt solution, adjust the pH of the solution to 7‑10, add borohydride salt, mix and dry. The preparation method improves the adsorption, dispersion and stability of the palladium compound; avoids high-temperature roasting and high-temperature hydrogen reduction links, and improves the thermal stability of the Pd species. The preparation method is simple, easy to control, and has a high value for popularization and application, and the catalyst exhibits excellent low-temperature oxidation elimination performance of CO.

Description

technical field [0001] The invention relates to a nano-palladium catalyst, in particular to a nano-palladium catalyst supported by a composite carrier, a preparation method thereof, and an application in CO oxidation. Background technique [0002] With the expansion and development of modern industry and the consumption of fossil energy, the problem of environmental pollution is becoming more and more serious. Among them, the environmental pollution hazards of industrial waste gas, transportation exhaust gas and carbon oxides in coal mine tunnels have attracted much attention, especially the elimination of CO. CO is a colorless, odorless, poisonous gas with strong toxicity and serious harm to human health. At present, the elimination of CO mainly consists of physical elimination and chemical elimination. The physical elimination method mainly refers to the use of some porous substances (such as activated carbon, etc.) to adsorb CO to reduce the residual amount of CO in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/26B01J23/89B01J23/60B01J37/03B01J37/16B01D53/86B01D53/62
CPCB01D53/62B01D53/8671B01J23/002B01J31/26B01J31/28B01J37/031B01J37/16B01D2257/502B01D2256/22B01J35/399B01J35/23Y02A50/20
Inventor 章青朱加明王巧莹李兵姜欢欢
Owner ANHUI NORMAL UNIV