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Composite catalyst for ozone oxidation and preparation method thereof

A composite catalyst, ozone oxidation technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Easy to fall off, poor catalytic effect and other problems, to achieve the effect of improving ozone oxidation efficiency, good repeated use effect, and strong practicability

Pending Publication Date: 2020-11-17
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method mainly has the following technical problems: 1. The active metal component is difficult to be evenly loaded on the carrier, resulting in poor catalytic effect; 2. The active metal component is easy to fall off during the use of the catalyst, resulting in a low recycling rate

Method used

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preparation example Construction

[0020] The invention provides a kind of preparation method of composite catalyst for ozone oxidation, comprising the following steps:

[0021] Activating the carrier to obtain an activated carrier;

[0022] Melting in a protective atmosphere after mixing the activated carrier, Cu and Mn, to obtain a catalyst precursor;

[0023] The catalyst precursor is impregnated in a cerium nitrate solution, and then dried and calcined to obtain a composite catalyst for ozone oxidation.

[0024] In the present invention, unless otherwise specified, the preparation raw materials used are commercially available products well known to those skilled in the art.

[0025] The invention activates the carrier to obtain the activated carrier. In the present invention, the carrier preferably includes activated alumina, kaolin or zeolite, more preferably activated alumina or zeolite; the particle size of the carrier is preferably 3-5 mm. In the present invention, the activation reagent used in the ...

Embodiment 1

[0037] (1) Wash the activated alumina with a particle size of 3-5mm three times with deionized water to remove the dust layer on the surface, soak it in 1mol / L nitric acid for 12 hours at room temperature (25°C), and then wash it with deionized water After the effluent is neutral, dry it at 90°C to obtain modified alumina (MDA);

[0038] (2) Mix Cu, Mn and MDA at a mass ratio of 0.020:0.010:1, place the resulting mixture in a pouring melting furnace, raise the temperature from room temperature to 1100°C at a rate of 5°C / min, and keep warm in an argon atmosphere. After smelting for 8 minutes, take it out of the furnace, pour it into the crucible, and obtain Cu-Mn-loaded alumina pellets after cooling, with a particle size of 3-5mm;

[0039] (3) Prepare a cerium nitrate aqueous solution with a concentration of 0.4 wt%, and immerse the Cu-Mn-loaded alumina pellets in the cerium nitrate aqueous solution at room temperature for 24 hours, and the Cu-Mn-loaded alumina pellets The dos...

Embodiment 2

[0042] (1) The zeolite with a particle diameter of 3 to 5 mm is cleaned 3 times with deionized water, and the dust layer on the surface is cleaned, soaked in hydrochloric acid with a concentration of 5 wt% for 12 hours at room temperature (25° C.), and then cleaned with deionized water until After the effluent is neutral, it is dried at 95°C to obtain a modified zeolite (MFA);

[0043] (2) Mix Cu, Mn and MFA at a mass ratio of 0.025:0.010:1, place the resulting mixture in a pouring melting furnace, raise the temperature from room temperature to 1100°C at a rate of 5°C / min, and keep warm in an argon atmosphere. After smelting for 8 minutes, take it out of the furnace, pour it into a crucible, and obtain Cu-Mn-loaded zeolite particles after cooling, with a particle size of 3-5mm;

[0044] (3) Prepare a cerium nitrate aqueous solution with a concentration of 0.3 wt%, and immerse the Cu-Mn-loaded zeolite particles in the cerium nitrate aqueous solution for 24 hours at room tempera...

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Abstract

The invention provides a composite catalyst for ozone oxidation and a preparation method thereof, and belongs to the technical field of environmental catalysis. The preparation method of the compositecatalyst for ozone oxidation provided by the invention comprises the following steps: activating a carrier to obtain an activated carrier; mixing the activated carrier, Cu and Mn, and smelting in a protective atmosphere to obtain a catalyst precursor; and dipping the catalyst precursor in a cerous nitrate solution, and then drying and roasting to obtain the composite catalyst for ozone oxidation.When copper and manganese are loaded, a melting method is adopted, so that copper species and manganese species can be uniformly dispersed on the surface and internal pores of the carrier, the copperspecies and the manganese species have a relatively strong bonding effect with the carrier, and meanwhile, the spatial network structure of the carrier cannot be damaged; an impregnation method is adopted during cerium loading, and then the composite catalyst is obtained through drying and roasting, so that the catalytic performance of the catalyst can be stabilized, and the ozone oxidation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, in particular to a composite catalyst for ozone oxidation and a preparation method thereof. Background technique [0002] Ozone oxidation technology is an advanced chemical oxidation water treatment technology. The catalyst is the core of ozone oxidation technology. In the field of wastewater treatment, the development of cheap, efficient, broad-spectrum and stable catalysts is a current research hotspot. In the prior art, the impregnation + roasting method is usually used to prepare the catalyst, so that the active metal component is supported on the carrier. However, this method mainly has the following technical problems: 1. The active metal component is difficult to be evenly loaded on the carrier, resulting in poor catalytic effect; 2. The active metal component is easy to fall off during the use of the catalyst, resulting in a low recycling rate. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J29/04B01J37/02C02F1/72C02F1/78C02F101/30
CPCB01J23/8892B01J29/04B01J37/0207C02F1/725C02F1/78B01J2229/18C02F2101/30Y02A50/20
Inventor 赖兰萍王明陈后兴陈冬英郭家旺周洁英张积锴胡小洣徐建兵梁鑫伍莺钟婷
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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