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Preparation method of loaded type silver catalyst for formaldehyde purification

A technology for the purification of supported silver and formaldehyde, which is used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. problem, to achieve high formaldehyde purification effect, low cost, simple operation effect

Inactive Publication Date: 2018-03-20
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the main problem in the preparation process of silver nanomaterials supported by carbon nanotube materials is that the silver nanoparticles are not uniformly dispersed on the surface of carbon nanotubes, and it is difficult to form silver nanoparticles with a single dispersion on the surface and a uniform particle size distribution.
Although the silver nanoparticles prepared by some methods are uniform in size, the method is relatively complicated and difficult to apply in practice.

Method used

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  • Preparation method of loaded type silver catalyst for formaldehyde purification
  • Preparation method of loaded type silver catalyst for formaldehyde purification
  • Preparation method of loaded type silver catalyst for formaldehyde purification

Examples

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preparation example Construction

[0031] Such as figure 1 Shown: the preparation method flow process of supported silver catalyst provided by the present invention mainly comprises following 6 steps:

[0032] (1), carbon nanotube acid treatment

[0033] Weigh a certain amount of CNT and add it to the oxidant, such as KMnO 4 or H 2 o 2 or HNO 3 or H 2 SO 4 or HCl in a three-necked flask, select different temperatures of 60-150°C and different reflux times of 1-24h, and carry out acid oxidation reflux treatment on CNT. It is colorless and has a pH of 6-8. Then put the suction-filtered solid powder in an oven and dry it at 80-100°C for 12-24 hours to prepare the acid-oxidized CNT sample;

[0034] (2), preparation of carbon nanotube suspension

[0035] Add the above acid-oxidized CNT sample into the organic solvent dimethyl sulfoxide DMSO, and sonicate for 0.5-12 hours to obtain a carbon nanotube suspension with a concentration of 30-500 mg / mL;

[0036] (3), preparation of silver precursor salt solution ...

Embodiment 1

[0044] (1), carbon nanotube acid treatment

[0045] Weigh 1.0g CNTs and add to the oxidant HNO 3 In a three-neck flask, select the reflux temperature of 60 ° C and the oxidation reflux time of 1 h to carry out acid oxidation treatment on CNTs. After the reflux is finished and the solution obtained from the reaction is cooled to room temperature, the obtained solution is suction filtered and washed until the filtrate obtained is colorless and has pH=7, then the solid powder obtained by the suction filtration is placed in an oven, After drying at 80°C for 12 hours, the CNTs samples treated with nitric acid oxidation can be prepared, and the scanning electron microscope photos are shown in figure 2 .

[0046] (2), preparation of carbon nanotube suspension

[0047] Add 1.0 g of the above acid-oxidized CNTs sample into 30 mL of dimethyl sulfoxide, and ultrasonicate for 0.5 h to obtain a suspension of carbon nanotubes.

[0048] (3), preparation of silver precursor salt solution...

Embodiment 2

[0056] (1), carbon nanotube acid treatment

[0057] Weigh 1.0g CNTs and add to the oxidant H 2 SO 4 In a three-neck flask, select the reflux temperature of 60 ° C and the oxidation reflux time of 1 h to carry out acid oxidation treatment on CNTs. After the reflux is finished and the solution obtained from the reaction is cooled to room temperature, the obtained solution is suction filtered and washed until the filtrate obtained is colorless and has pH=7, then the solid powder obtained by the suction filtration is placed in an oven, After drying at 80°C for 12 hours, the acid-oxidized CNTs samples can be prepared, and the scanning electron microscope photos are shown in Figure 5 .

[0058] The rest are the same as embodiment 1.

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Abstract

The invention relates to a preparation method of a loaded type silver catalyst for formaldehyde purification. A carbon nanometer tube is subjected to acidification treatment; carbon nanometer tube suspension is prepared; silver precursor salt solution is prepared; a carbon nanometer tube loaded silver catalyst Ag / CNT material is prepared; reaction is performed for 0.5 to 6h under the temperature condition of 60 to 100 DEG C; drying is performed for 12 to 24h under the temperature of 80 to 100 DEG C; calcination is performed for 2 to 3h at 300 to 500 DEG C to obtain an Ag / CNT nanometer catalystmaterial. The method overcomes the defects that the dispersion of the silver nanometer particles on the surface of the carbon nanometer tube is nonuniform, and the silver nanometer particles realizing the single dispersion and uniform particle diameter distribution are difficult to form. The preparation method provided by the invention is mild; the operation is simple; the cost is low; the repeatability is high; higher feasibility is realized; the dispersion effect is good; a higher formaldehyde purification effect is achieved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a supported silver catalyst for purifying formaldehyde. Background technique [0002] Formaldehyde is one of the main pollutants in volatile organic pollutants (VOCs), especially widely present in indoor environments. The use of noble metal catalysts to catalyze the oxidation of volatile organic pollutants is currently a research hotspot in the field of atmospheric environment purification. Research on new, high-efficiency, low-temperature, and cheap catalyst materials to reduce the complete conversion temperature of VOCs catalytic oxidation is the key problem to be solved in the field of catalytic oxidation. [0003] Relatively cheap silver catalysts are considered to be a formaldehyde catalytic oxidation catalyst material with good development potential, but the reaction temperature of silver catalysts in the formaldehyde catalytic oxidation reaction i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J37/12B01J37/34B01J37/08B01J35/10B01D53/86B01D53/72
CPCB01D53/8668B01J23/50B01J37/088B01J37/12B01J37/343B01D2256/22B01D2257/708B01J35/396B01J35/60
Inventor 陈丹石静田树梅肖瑜姚燕彬吴春柳王诗雯
Owner YANGZHOU UNIV
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