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 strong application potential in the low-temperature oxidation of CO, but Co 3 o 4 Catalysts are rarely reported in the field of low-temperature oxidation of formaldehyde

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
Effect test

Embodiment 1

[0031] A catalyst used for the catalytic oxidation of formaldehyde is a core-shell structure, and the core is Co 3 o 4 , the shell is CeO 2 , the ratio of core to 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 preparation method of the catalyst used in the above-mentioned a kind of formaldehyde catalytic oxidation, promptly adopts co-current co-precipitation method at first to prepare Co 3 o 4 Catalyst particles, then in Co 3 o 4 Surface supported CeO on catalyst particles 2 Shell, its preparation process specifically comprises the following steps:

[0035] (1) Add 125 mL of 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 mixed solution is added dropwise to 30mL of Na 2 CO 3In the beaker of solution Ⅲ, cont...

Embodiment 1

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

[0046] Mix 0.5 g of cobalt tetroxide powder with a particle size of 200-250 mesh obtained in Example 1 with an equal volume of quartz sand and fix it to the middle section of a reaction tube with an inner diameter of 6 mm in a micro-quartz tube fixed-bed reactor. N / min 2 After pretreatment at 200°C for 30 minutes under the atmosphere, then lower to room temperature, and then switch the reaction gas with a total flow rate of 50mL / min to carry out the catalytic reaction. In the reaction gas, the formaldehyde gas is 600ppm, the balance is air, formaldehyde gas By balance gas N 2 Bring it through a paraformaldehyde bubbler (water bath heated at 36°C). During the reaction process, the reaction temperature is controlled from 25°C, 50°C, 80°C, 100°C, 120°C, 150°C, 180°C, 200°C to 230°C. After each temperature point is reacted for 30 minutes, the reaction ta...

Embodiment 2

[0050] A catalyst used for the catalytic oxidation of formaldehyde is a core-shell structure, and the core is Co 3 o 4 , the shell is CeO 2 , the ratio of core to shell is calculated according to the mole percentage of Co and Ce metal atoms, as follows:

[0051] Co 95.55%

[0052] Ce 4.45%.

[0053] The preparation method of the catalyst used in the above-mentioned a kind of formaldehyde catalytic oxidation, promptly adopts co-current co-precipitation method at first to prepare Co 3 o 4 Catalyst particles, then in Co 3 o 4 Surface supported CeO on catalyst particles 2 Shell, its preparation process specifically comprises the following steps:

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

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

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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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