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Nano-palladium catalyst and preparation and application methods thereof

A catalyst and nano-palladium technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy loss of active components, long preparation cycle, and inability to achieve effective use. Effects of preparation process and preparation cycle, simplification of preparation process and preparation cycle, and avoidance of high-temperature hydrogen reduction

Active Publication Date: 2019-03-08
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the oxidation reaction of Pd-based catalysts to CO is greatly affected by its grain size, morphology and type, and the catalysts are prone to sintering and agglomeration during the reaction process, and the active components are easily lost in the high-speed reaction gas flow, which makes the catalyst The performance is greatly reduced, and the conditions for its effective use are often completely unreachable in actual use, thus making it more limited in actual application
For stable catalysts, the preparation methods are often more complicated, such as encapsulation or template method, the preparation cycle is longer and the process is more cumbersome

Method used

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  • Nano-palladium catalyst and preparation and application methods thereof
  • Nano-palladium catalyst and preparation and application methods thereof
  • Nano-palladium catalyst and preparation and application methods thereof

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Experimental program
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preparation example Construction

[0018] The invention provides a kind of preparation method of nano palladium catalyst, wherein, described preparation method comprises:

[0019] 1) Pretreatment of the carrier: heat-treat the alumina carrier; in the presence of the first solvent, mix the heat-treated alumina carrier with cellulose, and crystallize at a temperature of 60-100°C for 6 -24h, making the pretreated carrier;

[0020] 2) Preparation of nano-palladium catalyst: after mixing the palladium salt with the second solvent, a palladium salt solution is obtained, adding the pretreated carrier prepared in step 1) to the palladium salt solution for impregnation, and adding a reducing agent to mix Afterwards, stirring for 5-24 hours at a temperature of 20-80° C. to prepare a nano-palladium catalyst.

[0021] The present invention uses cellulose to modify the alumina carrier, effectively improves the surface group characteristics of the alumina carrier, improves the interaction between the carrier and palladium, ...

preparation example 1

[0043] Weigh 20g of acidic Al 2 o 3 , placed in a muffle furnace and roasted at 200°C for 2 hours and cooled, mixed with 100g of water and stirred, then added 0.4g of cellulose to the mixed liquid, after fully dispersed, put it into the reaction kettle, at 80°C Crystallize for 12 hours, wash with water until neutral, and dry for later use. Weigh 10g of the treated Al after drying above 2 o 3 Immerse in a dilute hydrochloric acid solution of 0.56mmol palladium chloride, adjust the acidity of the solution to weak alkaline (pH 8), add 0.8g of sodium borohydride, cover and seal, stir at 40°C for 10h, wash with water until neutral , place in the desiccator, dry at room temperature, the nano-palladium catalyst that the content that obtains palladium is 1% by weight is denoted as A1, and the transmission electron microscope figure of the nano-palladium catalyst particle size that makes is as follows figure 1 shown.

preparation example 2

[0045] Prepare according to the preparation method of Preparation Example 1, the difference is that the amount of cellulose is 1.2g, and the palladium content is 1% by weight of nano-palladium catalyst, denoted as A2.

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Abstract

The invention discloses a nano-palladium catalyst and preparation and application methods thereof. The preparation method of the nano-palladium catalyst comprises 1) preprocessing a carrier, specifically, performing thermal treatment on an aluminum oxide carrier, and with existence of first solvent, mixing the thermally treated aluminum oxide carrier with cellulose and then crystalizing the mixture at 60-100 DEG C to obtain a preprocessed carrier; 2) preparing the nano-palladium catalyst, specifically, mixing palladium salt with second solvent to obtain a palladium salt solution, adding the preprocessed carrier of the step 1) into the palladium salt solution for impregnation, then mixing in reducing agent, and stirring the mixed solution at 20-80 DEG C for 5-12 h to obtain the nano-palladium catalyst. The nano-palladium catalyst is simple in preparation method and high in catalytic performance and has no special requirements on application conditions, thereby greatly broadening the application range.

Description

technical field [0001] The invention relates to the field of nanometer metal catalysts, in particular to nanometer palladium catalysts and their preparation methods and applications. 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, industrial waste gas, transportation exhaust, and carbon oxides produced in coal mine tunnels have attracted much attention to environmental pollution, especially the impact of CO. And CO is a colorless, odorless, poisonous gas, and its toxicity is extremely strong, which is a serious hazard to human health. At present, the elimination of CO mainly includes 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 air. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J37/02B01J37/10B01J37/16B01D53/62B01D53/86
CPCB01D53/62B01D53/8671B01D2256/22B01D2257/502B01J23/44B01J37/0201B01J37/10B01J37/16Y02A50/20
Inventor 章青王巧莹张秀春朱加明李兵黄超
Owner ANHUI NORMAL UNIV