CN111974380A

CN111974380A - Ozone decomposition catalyst and preparation method thereof

Info

Publication number: CN111974380A
Application number: CN202010893963.4A
Authority: CN
Inventors: 浦琦伟; 蒋颉; 孙亮; 杨金; 倪蓓; 王卫东; 岳军; 贾莉伟; 徐岘; 王家明; 王燕; 马承艺
Original assignee: Wuxi Weifu Environmental Protection Catalyst Co Ltd
Current assignee: Wuxi Weifu Environmental Protection Catalyst Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-24
Anticipated expiration: 2040-08-31
Also published as: CN111974380B

Abstract

The invention relates to an ozone decomposition catalyst and a preparation method thereof, wherein the ozone decomposition catalyst comprises 30-60 wt.% of nano sol and 40-70 wt.% of manganese-cerium composite oxide. The preparation method comprises the following steps: weighing and stirring the nano sol; weighing soluble trivalent cerium salt, adding deionized water, stirring and dissolving, and slowly dripping into the nano sol; dropwise adding carboxylic acid into the mixed slurry, adjusting the pH of the mixed slurry to be 2-4, and stirring for 2-10 hours for later use; weighing potassium permanganate, adding the potassium permanganate into deionized water, stirring and dissolving, then slowly dropping into the mixed slurry, and stirring for 24-48 hours; and carrying out suction filtration on the obtained slurry, and drying a filter cake at 80-120 ℃ to obtain the ozonolysis catalyst. The catalyst of the invention has simple preparation process and mild reaction condition, and the synthesized ozonolysis catalyst can be thoroughly decomposed by ozone at room temperature, and has excellent moisture resistance and long service life.

Description

Ozone decomposition catalyst and preparation method thereof

Technical Field

The invention belongs to the field of catalytic materials and air purification, and particularly relates to an ozone decomposition catalyst and a preparation method thereof.

Background

Ozone is a relatively wide range of air pollutants currently available. The source of the method is that the other pollutants in the air are generated by a series of photochemical reactions under the irradiation of ultraviolet light; secondly, ozone is released when used as an antibacterial agent and a disinfectant in industrial production; and thirdly, high-voltage discharge is generated when indoor electric appliances such as a copying machine and a scanner work. Ozone is extremely harmful to human health, and countries in the world have strict limits on the allowable concentration of ozone. In 2012, the newly revised environmental air quality standard in China brought the ozone concentration for 8 hours into the conventional air quality evaluation. The safety concentration of ozone specified by the national ministry of health is 0.1ppm, the industrial hygiene standard is 0.15ppm, and the work protection department specifies that the work is allowed to be carried out for no more than 10 hours under the safety concentration.

Noble metal ozonolysis catalysts have high activity, but are expensive and not suitable for wide use. Most of the currently developed ozone catalysts are transition metal oxides, mainly manganese oxide and iron oxide series (for example, patent nos. CN101402047A, CN102513106A, CN101757933A, etc.). The synthesis process generally needs high temperature and high pressure, the energy consumption in the production process is high, and the catalytic performance of part of products is greatly interfered by humidity. Therefore, there is an urgent need to develop a novel efficient ozonolysis catalyst synthesized using a simple process.

Disclosure of Invention

One of the objects of the present invention is to overcome the disadvantages of the prior art and to provide an ozonolysis catalyst which can decompose ozone at room temperature with high efficiency, has excellent moisture resistance and has a long service life.

The invention also aims to provide a preparation method of the ozonolysis catalyst, which has simple preparation process and mild reaction conditions.

According to the technical scheme provided by the invention, the ozone decomposition catalyst is characterized in that: the manganese-cerium composite oxide is loaded on the nano sol, and the ozone decomposition catalyst contains 30-60 wt.% of nano sol and 40-70 wt.% of manganese-cerium composite oxide.

Preferably, the nano sol is one or more of aluminum sol, zirconium sol or silica sol, and the nano sol D ₉₀5 to 100 nm. Further preferably, the nanosol is an aluminum sol.

A method for preparing an ozone decomposition catalyst comprises the following steps:

(1) weighing and stirring the nano sol;

(2) weighing soluble trivalent cerium salt, adding the soluble trivalent cerium salt into deionized water, stirring and dissolving, and slowly dropwise adding the soluble trivalent cerium salt into the nano sol obtained in the step (1);

(3) dropwise adding carboxylic acid into the mixed slurry obtained in the step (2), adjusting the pH of the mixed slurry to be 2-4, and stirring for 2-10 hours for later use;

(4) weighing potassium permanganate, adding the potassium permanganate into deionized water, stirring and dissolving, then slowly dripping the potassium permanganate into the mixed slurry obtained in the step (3), and stirring for 24-48 hours;

(5) and (3) carrying out suction filtration on the slurry prepared in the step (4), and drying a filter cake at 80-120 ℃ to obtain the ozonolysis catalyst.

Preferably, the solid content of the nano sol is 5-30%.

Preferably, the soluble trivalent cerium salt is one or more of cerium acetate, cerium nitrate, cerium sulfate or cerium chloride; and the molar concentration of the soluble trivalent cerium salt is 0.1-2 mol/L. More preferably, the trivalent cerium salt is cerium acetate.

Preferably, the carboxylic acid is one or more of formic acid, acetic acid, oxalic acid, propionic acid or malonic acid. Further preferably, the carboxylic acid is acetic acid.

Preferably, the molar concentration of the potassium permanganate is 0.1-2 mol/L.

Preferably, the molar ratio of the trivalent cerium salt to the potassium permanganate is (2-2.5): 1.

The catalyst of the invention has simple preparation process and mild reaction condition, and the synthesized ozonolysis catalyst can be thoroughly decomposed by ozone at room temperature, and has excellent moisture resistance and long service life.

Drawings

FIG. 1 is a graph of ozonolysis conversion for example 1 and example 2.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

(1) Weighing D₉₀100g of alumina sol with the solid content of 20 percent and the particle size of 60nm is stirred;

(2) weighing 0.2mol of trivalent cerium acetate hydrate, adding 0.1L of deionized water, stirring and dissolving, and slowly dropwise adding the mixture into the aluminum sol obtained in the step (1);

(3) dropwise adding acetic acid into the mixed slurry obtained in the step (2), adjusting the pH of the mixed slurry of the aluminum sol and the cerium salt to =3, and stirring for 8 hours;

(4) weighing 0.1mol of potassium permanganate, adding 0.1L of deionized water, stirring and dissolving, slowly dropping into the mixed slurry of the step (3), and stirring for 36 hours;

(5) and (4) carrying out suction filtration on the slurry prepared in the step (4), and drying the filter cake in a blast oven at 120 ℃ to obtain the ozonolysis catalyst.

The ozonolysis catalyst obtained in example 1 contained 35wt.% of a nanosol and 65wt.% of a manganese-cerium composite oxide.

Example 2

(1) Weighing D₉₀200g of alumina sol with the solid content of 20 percent and the particle size of 60nm is stirred;

(2) weighing 0.2mol of trivalent cerium acetate hydrate, adding 0.2L of deionized water, stirring and dissolving, and slowly dropwise adding the trivalent cerium acetate hydrate into the aluminum sol obtained in the step (1);

(4) weighing 0.1mol of potassium permanganate, adding 0.2L of deionized water, stirring and dissolving, slowly dropping into the mixed slurry obtained in the step (3), and stirring for 36 hours;

(5) and (4) carrying out suction filtration on the slurry obtained in the step (4), and drying the filter cake in a blast oven at 120 ℃ to obtain the ozonolysis catalyst.

The ozonolysis catalyst obtained in example 2 contained 40wt.% of the nanosol and 60wt.% of the manganese-cerium composite oxide.

1g (40-60 mesh) of each of the ozonolysis catalyst powders obtained in example 1 and example 2 was added to 1g of quartz sand of 40-60 mesh, and the mixture was uniformly mixed and put into a reaction tube. The evaluation conditions were as follows: the reaction temperature was 22 ℃, the air relative humidity RH =35%, the initial concentration of ozone was 50ppm, the gas flow rate was 5L/min, the reaction was continued for 100 hours, and the ozone conversion efficiency was recorded every 5 hours. The experimental data were obtained as shown in the following figure:

as shown in FIG. 1, the ozonolysis catalysts prepared in examples 1 and 2 maintained high ozonolysis conversion efficiency after the reaction was continued at room temperature for 100 hours.

Claims

1. An ozonolysis catalyst characterized by: the manganese-cerium composite oxide is loaded on the nano sol, and the ozone decomposition catalyst contains 30-60 wt.% of nano sol and 40-70 wt.% of manganese-cerium composite oxide.

2. The ozonolysis catalyst according to claim 1, characterized in that: the nano sol is one or more of aluminum sol, zirconium sol or silica sol, and the nano sol D₉₀5 to 100 nm.

3. A method for preparing an ozone decomposition catalyst comprises the following steps:

(1) weighing and stirring the nano sol;

4. The method for preparing an ozonolysis catalyst according to claim 3, characterized in that: the solid content of the nano sol is 5-30%.

5. The method for preparing an ozonolysis catalyst according to claim 3, characterized in that: the soluble trivalent cerium salt is one or more of cerium acetate, cerium nitrate, cerium sulfate or cerium chloride; and the molar concentration of the soluble trivalent cerium salt is 0.1-2 mol/L.

6. The method for preparing an ozonolysis catalyst according to claim 3, characterized in that: the carboxylic acid is one or more of formic acid, acetic acid, oxalic acid, propionic acid or malonic acid.

7. The method for preparing an ozonolysis catalyst according to claim 3, characterized in that: the molar concentration of the potassium permanganate is 0.1-2 mol/L.

8. The method for preparing an ozonolysis catalyst according to claim 3, characterized in that: the molar ratio of the trivalent cerium salt to the potassium permanganate is (2-2.5): 1.