Catalyst for formaldehyde catalytic oxidation and preparation method of catalyst

A catalytic oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as low reaction temperature, achieve good performance repeatability, Easy to scale production and maintain the effect of dispersion

Inactive Publication Date: 2015-02-18
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the noble metal catalyst system, Co 3 o 4 Due to the advantages of low price, low reaction temperature and high catalytic activity, the catalyst has shown a

Method used

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  • Catalyst for formaldehyde catalytic oxidation and preparation method of catalyst
  • Catalyst for formaldehyde catalytic oxidation and preparation method of catalyst
  • Catalyst for formaldehyde catalytic oxidation and preparation method of catalyst

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0030] Example 1

[0031] A catalyst used in the catalytic oxidation of formaldehyde has a core and shell structure, and the core is Co 3 O 4 , The shell is CeO 2 , The ratio of core-shell is calculated according to the mole percentage of Co and Ce metal atoms, as follows:

[0032] Co 97.60%

[0033] Ce 2.40%.

[0034] The above-mentioned preparation method of the catalyst used in the catalytic oxidation of formaldehyde is to first adopt the co-current co-precipitation method to prepare Co 3 O 4 Catalyst particles, then in Co 3 O 4 CeO on the surface of catalyst particles 2 The preparation process of the shell layer specifically includes the following steps:

[0035] (1), 125mL of 1mol / L Co(NO 3 ) 2 Solution I and 437.5mL Na with a concentration of 0.5mol / L 2 CO 3 Solution Ⅱ is mixed according to the volume ratio of 1:3.5, and the volume of each drop is controlled to be 0.05-0.07mL. The resulting mixture is added dropwise to 30mL Na with a concentration of 0.5mol / L 2 CO 3 In the beak...

Example Embodiment

[0044] Application Comparative Example 1

[0045] Take the cobalt tetraoxide powder with a particle size of 200-250 mesh obtained in step (1) of Example 1 as a control;

[0046] 0.5g of the cobalt tetroxide powder obtained in Example 1 with a particle size of 200-250 mesh was mixed with an equal volume of quartz sand and then fixed to the middle section of the reaction tube with an inner diameter of 6 mm in a micro-quartz tube fixed bed reactor at a flow rate of 30 mL / min of N 2 After pretreatment at 200°C for 30 minutes in an atmosphere, then it was cooled to room temperature, and then the reactant gas with a total flow rate of 50mL / min was switched to carry out the catalytic reaction. The reactant gas contained 600 ppm of formaldehyde gas, and the balance was air and formaldehyde gas. By balance gas N 2 It is brought in through a paraformaldehyde bubbler (heated in a water bath at 36°C). During the reaction, control the reaction temperature from 25℃, 50℃, 80℃, 100℃, 120℃, 15...

Example Embodiment

[0049] Example 2

[0050] A catalyst used in the catalytic oxidation of formaldehyde has a core and shell structure, and the core is Co 3 O 4 , The shell is CeO 2 , The ratio of core-shell is calculated based on the mole percentage of Co and Ce metal atoms, as follows:

[0051] Co 95.55%

[0052] Ce 4.45%.

[0053] The above-mentioned preparation method of the catalyst used in the catalytic oxidation of formaldehyde is to first adopt the co-current co-precipitation method to prepare Co 3 O 4 Catalyst particles, then in Co 3 O 4 CeO on the surface of catalyst particles 2 The preparation process of the shell layer specifically includes the following steps:

[0054] (1) Cobalt tetroxide powder with a particle size of 200-250 mesh, the specific process is the same as in Example 1;

[0055] (2) Dissolve 1.439g of cerium nitrate hexahydrate in 50mL of water to obtain a cerium nitrate aqueous solution IV with a concentration of 0.066mol / L, and add 5g of powdered cobalt tetroxide prepared in ...

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Abstract

The invention discloses a catalyst for formaldehyde catalytic oxidation and preparation method of the catalyst. The catalyst for formaldehyde catalytic oxidation is of a nuclear and shell structure; a nuclear is Co3O4, and a shell is CeO2; the ratio of the nuclear to the shell is calculated according to the mole percent of Co and Ce metal atoms; Co is 95.55-97.60 percent, and Ce is 2.40-4.45 percent. According to the preparation method, Co3O4 catalyst particles are prepared by a parallel flow coprecipitation method, and the surfaces of the Co3O4 catalyst particles are loaded with a CeO2 shell layer. The catalyst for formaldehyde catalytic oxidation can be used for enabling the conversion rate of formaldehyde to be 100 percent under room temperature of 25 DEG C; meanwhile, the catalyst is extremely high in catalysis and CO2 selectivity.

Description

technical field [0001] The invention relates to a catalyst used for catalytic oxidation of formaldehyde and a preparation method thereof, belonging to the technical field of environmental catalysis. Background technique [0002] There are many ways to eliminate formaldehyde, such as adsorption method, chemical reaction method and so on. Among them, the catalytic oxidation method under mild conditions is considered to be an effective method to completely eliminate formaldehyde: indoor HCHO is completely oxidized to H under mild reaction conditions 2 O and CO 2 , has become the focus of researchers' attention. [0003] Since the end of last century, a lot of work on indoor formaldehyde catalytic oxidation reaction and catalytic system has been carried out at home and abroad. Its catalytically active components are generally noble metals (Pt, Au and Pd). Due to the high price of these precious metals, its general promotion is limited. [0004] Therefore, the development of...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/86B01D53/72
Inventor 吴贵升张叶毛东森卢冠忠
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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