Preparation method of catalyst for degrading VOCs

Abstract

The invention discloses a preparation method of a catalyst for degrading VOCs (volatile organic compounds), which comprises the following steps: stirring and mixing 25-30 parts by weight of manganese dioxide powder, 20-25 parts by weight of montmorillonite powder, 10-15 parts by weight of cerium oxide powder and 25-35 parts by weight of water glass to obtain a mixture; extruding the obtained mixture into a honeycomb shape by using an extruder, and then drying to obtain a formed material; and calcining the obtained forming material to obtain the catalyst for degrading the VOCs. The method is simple, suitable for mass production, low in production cost and high in catalytic efficiency.

Description

Technical Field

[0001] The present invention relates to a method for preparing a catalyst, and in particular to a method for preparing a catalyst for degrading VOCs. Background Art

[0002] Volatile organic compounds (VOCs) are a significant atmospheric pollutant, including alkanes, alkenes, aromatic hydrocarbons, and their derivatives. Currently, the main catalytic treatment technologies for VOCs include adsorption, absorption, low-temperature plasma, and catalytic oxidation combustion. Catalytic oxidation combustion, with its advantages of high efficiency and low energy consumption, can effectively catalytically oxidize a variety of VOCs to CO2 and H2O, thus attracting extensive research. Currently, low-temperature VOC oxidation catalysts primarily utilize active substances loaded on a high-surface-area carrier, resulting in complex preparation processes and high production costs. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a method for preparing a catalyst for degrading VOCs, comprising the following steps:

[0004] (1) stirring and mixing 25-30 parts by weight of manganese dioxide powder, 20-25 parts by weight of montmorillonite powder, 10-15 parts by weight of cerium oxide powder, and 25-35 parts by weight of water glass to obtain a mixture;

[0005] (2) extruding the mixture obtained in step (1) into a honeycomb shape using an extruder, and then drying to obtain a molding material;

[0006] (3) The molding material obtained in step (2) is calcined to obtain the catalyst for degrading VOCs.

[0007] The drying temperature in step (2) is 110-140° C., and the drying time is 2-3 hours.

[0008] The calcination temperature in step (3) is 450-600° C., and the calcination time is 1-2 hours.

[0009] The particle size of the manganese dioxide powder is 200 mesh; the particle size of the montmorillonite powder is 400 mesh; and the particle size of the cerium oxide powder is 200 mesh.

[0010] The beneficial effects of the present invention are:

[0011] Compared with the prior art, the present invention controls the amount of each raw material and sintering manganese dioxide powder, montmorillonite powder and cerium oxide powder. This method is simple, suitable for mass production, low in production cost and high in catalytic efficiency. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention are described clearly and completely below. It should be understood that the embodiments described are merely some, not all, of the present invention. Experimental methods in the following examples where specific conditions are not specified are generally performed under conventional conditions. Unless otherwise defined, all practical and scientific terms used herein have the same meanings as those familiar to those skilled in the art.

[0013] Example 1 Preparation method of a catalyst for degrading VOCs

[0014] The following steps are involved:

[0015] (1) 25 parts of manganese dioxide powder, 25 parts of montmorillonite powder, 10 parts of cerium oxide powder, and 35 parts of water glass were stirred and mixed to obtain a mixture;

[0016] (2) extruding the mixture obtained in step (1) into a honeycomb shape using an extruder, and then drying to obtain a molding material;

[0017] (3) The molding material obtained in step (2) is calcined to obtain the catalyst for degrading VOCs.

[0018] The drying temperature in step (2) is 140° C. and the drying time is 2 h.

[0019] The calcination temperature in step (3) is 450° C. and the calcination time is 1 h.

[0020] The particle size of the manganese dioxide powder is 200 mesh; the particle size of the montmorillonite powder is 400 mesh; and the particle size of the cerium oxide powder is 200 mesh.

[0021] Example 2 Preparation method of a catalyst for degrading VOCs

[0022] The following steps are involved:

[0023] (1) 30 parts by weight of manganese dioxide powder, 20 parts of montmorillonite powder, 15 parts of cerium oxide powder, and 25 parts of water glass were stirred and mixed to obtain a mixture;

[0024] (2) extruding the mixture obtained in step (1) into a honeycomb shape using an extruder, and then drying to obtain a molding material;

[0025] (3) The molding material obtained in step (2) is calcined to obtain the catalyst for degrading VOCs.

[0026] The drying temperature in step (2) is 110° C. and the drying time is 3 h.

[0027] The calcination temperature in step (3) is 600° C. and the calcination time is 2 h.

[0028] The particle size of the manganese dioxide powder is 200 mesh; the particle size of the montmorillonite powder is 400 mesh; and the particle size of the cerium oxide powder is 200 mesh.

[0029] Example 3 Preparation method of a catalyst for degrading VOCs

[0030] The following steps are involved:

[0031] (1) 28 parts of manganese dioxide powder, 23 parts of montmorillonite powder, 12 parts of cerium oxide powder, and 30 parts of water glass were stirred and mixed to obtain a mixture;

[0032] (2) extruding the mixture obtained in step (1) into a honeycomb shape using an extruder, and then drying to obtain a molding material;

[0033] (3) The molding material obtained in step (2) is calcined to obtain the catalyst for degrading VOCs.

[0034] The drying temperature in step (2) is 125° C. and the drying time is 2.5 h.

[0035] The calcination temperature in step (3) is 550° C. and the calcination time is 1.5 h.

[0036] The particle size of the manganese dioxide powder is 200 mesh; the particle size of the montmorillonite powder is 400 mesh; and the particle size of the cerium oxide powder is 200 mesh.

[0037] Application Example 1

[0038] The VOCs catalyst prepared in Example 1-3 was tested for toluene catalytic efficiency, with an exhaust gas volume of 1 L / min and an inlet gas concentration of 1500 mg / m 3 , the catalytic combustion temperature is 180℃, and the catalytic efficiency is shown in the following table:

[0039] Example Catalytic efficiency Example 1 90.2％ Example 2 91.5％ Example 3 93.4％

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a catalyst for degrading VOCs, characterized in that: The following steps are involved: (1) stirring and mixing 25-30 parts by weight of manganese dioxide powder, 20-25 parts by weight of montmorillonite powder, 10-15 parts by weight of cerium oxide powder, and 25-35 parts by weight of water glass to obtain a mixture; (2) extruding the mixture obtained in step (1) into a honeycomb shape using an extruder, and then drying to obtain a molding material; (3) The molding material obtained in step (2) is calcined to obtain the catalyst for degrading VOCs.

2. The method for preparing a catalyst for degrading VOCs according to claim 1, wherein: The drying temperature in step (2) is 110-140° C., and the drying time is 2-3 hours.

3. The method for preparing a catalyst for degrading VOCs according to claim 1, wherein: The calcination temperature in step (3) is 450-600° C., and the calcination time is 1-2 hours.