CN104353355A - Ceramic purifier for purifying ozone in air and preparation method of ceramic purifier - Google Patents

Abstract

The invention discloses a ceramic purifier for ozone purification in the air and a preparation method thereof. The ceramic purifier for ozone purification in the air is loaded with 7-8% by weight on a porous ceramic carrier. Mn ₃ O ₄ /CuO or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst. The preparation method is as follows: the composite catalyst, water-based polyacrylic acid resin and water are mixed and put into a sand mill for grinding, and then passed through a 325-mesh standard sieve to obtain a catalyst suspension; then the aluminum oxyhydroxide sol is mixed with the obtained catalyst suspension , use a compressed air spray gun to spray the obtained catalyst slurry on the porous ceramic carrier at a controlled pressure of 5-10MPa, and then put it in an oven at 100-180°C for drying for 10-20min; repeat the process of spraying and drying until the porous ceramic When the weight of the carrier increases by 7-8%, it stops, and the ceramic purifier for ozone purification in the air is obtained.

Description

Ceramic purifier for ozone purification in air and preparation method thereof

technical field

The present invention relates to a ceramic purifier for ozone purification in the air and a preparation method thereof.

Background technique

With the continuous improvement of people's quality of life, people pay more and more attention to the quality of their living environment, and the problem of air quality has entered the field of vision of ordinary people. Pollution such as ozone and formaldehyde has become a problem that cannot be ignored. Studies in recent years have shown that the catalysts currently used in the market are mainly metal oxides and corresponding metals. However, in the selection of catalytically active components, the metal activity is lower than that of the corresponding metal oxides, and the metal's ability to decompose ozone is insufficient, and the current raw material cost is relatively high, which hinders its application. The catalyst must be attached to a certain carrier to complete the air purification function, and people have also selected a variety of materials for the carrier of the catalyst. Zhai Li and Zhang Wenlu from the Chengdu Center for Disease Control and Prevention (Zhai Li, Zhang Wenlu. Research on formaldehyde purification paper [J]. China Environmental Health, 2003, 6(1~3): 113) developed a purification paper that captures formaldehyde, Paste the purification paper on the furniture to achieve the purpose of purifying the air. Zhang Pengyi and Li Zhao from Tsinghua University (Zhang Pengyi, Li Zhao, Tian Di. Photocatalytic degradation of toluene by titanium dioxide coating materials [J]. Shanghai Environmental Science, 2002, 21(12): 709~71l) et al. TiO ₂ is coated on the surface of three common materials, ceramic tiles and gaze lamps, and it is expected to develop a decoration material with self-cleaning function. These two carriers have the disadvantages of easy powdering, poor bonding between the catalyst and the carrier, and low light utilization efficiency.

Using porous ceramics as a catalyst carrier is a better method. When high-porosity porous ceramics are used for air purification, they can not only filter the dust particles in the gas, but also purify harmful gases after loading the catalyst.

At present, domestic porous ceramics, as an environmentally friendly material with excellent characteristics, are often used in the filtration of outdoor polluted gases, such as denitrification of flue gas from power plants, and filtration of automobile exhaust. The most common methods of assembling catalysts and porous ceramic substrates are dip-coating and spin-coating, among which dip-coating is popular because it is simple and does not require complicated equipment. However, the specific surface area of the product obtained by this method is small, which weakens its catalytic efficiency; Xie Min’s dissertation (Xie Min. Preparation and Performance Research of Porous Ceramics for Air Purification. [D].[Master’s Dissertation]. Hebei: Shijiazhuang Introduced in Railway Academy, 2007.), the catalyst sol is coated on a porous ceramic carrier to study its purification effect on formaldehyde, but this method is affected by the thickness and uniformity of the coating film, and the coating film is easy to crack after drying , resulting in weak bonding with the ceramic body. To sum up, ceramic purifiers used for air purification have attracted much attention at present, and there is still a technical problem of assembling the catalyst and the carrier, and this problem is exactly the technical problem to be solved in the present invention.

Contents of the invention

The purpose of the present invention is to provide a ceramic purifier for ozone purification in air with simple operation, strong practical application feasibility, low cost and high catalytic degradation efficiency in order to solve the technical problems of the above-mentioned assembly of catalyst and carrier and its preparation method.

Technical scheme of the present invention

A ceramic purifier for ozone purification in air, that is, a porous ceramic carrier is loaded with a Mn ₃ O ₄ /CuO composite catalyst or a Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst, preferably loaded with Mn ₃ O ₄ /CuO Composite catalyst;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst, calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst : The porous ceramic support is 7-8:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

(1) Mix according to the ratio of Mn ₃ O ₄ /CuO or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst: water-based polyacrylic resin: water in the ratio of 1:0.5:2.0-2.7 and put it into the sand mill In the machine, the control speed is 1200r/min to grind for 30-60min, and then pass through a 325-mesh standard sieve to obtain a catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, mix the alumina oxyhydroxide sol with a solid content of 44.2% and the catalyst suspension obtained in step (1) at a volume ratio of 1:1-1.5 Evenly, the catalyst slurry is obtained;

(3) Use a compressed air spray gun to spray the catalyst slurry obtained in step (2) onto the porous ceramic carrier at a controlled pressure of 6-9Mpa, and then put the sprayed porous ceramic carrier into an oven at 100-180°C, preferably 120°C Dry in 10-20min;

Repeat the above-mentioned spraying and drying process until the porous ceramic carrier increases in weight by 7-8% to obtain a porous ceramic carrier loaded with Mn ₃ O ₄ /CuO composite catalyst or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalyst, That is, a ceramic purifier for ozone purification in the air.

The above obtained ceramic purifier for ozone purification in air is used for degrading ozone in air. the

Beneficial effects of the present invention

A ceramic purifier for ozone purification in air according to the present invention, because Mn ₃ O ₄ /CuO or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalysts are selected for use, Mn ₃ O ₄ in the composite catalyst is decomposed for O ₃ The activity is very good, and the second metal oxide CuO or Fe ₂ O ₃ further improves the performance of the composite catalyst. Considering the factors of research and production cost, CuO is preferred as the second metal oxide, and the final ceramic purifier used for ozone purification in the air can purify the ozone in the air, and the ozone degradation rate can reach 97%.

Further, a kind of preparation method of the ceramic purifier that the ozone in the air of the present invention purifies is useful, because in the preparation process, Mn ₃ O ₄ /CuO or Mn ₃ O ₄ /Fe ₂ O ₃ composite catalysts are relatively easy to obtain, adopt simultaneously The ball milling technology is used to obtain the catalyst center slurry with fine particles and uniform size, and then the catalyst center slurry is uniformly loaded on the porous ceramic carrier by using multiple spraying techniques. Therefore, the obtained ceramic air filter has good performance consistency and a long service life.

specific embodiment

The present invention is further illustrated below by specific examples, but the present invention is not limited.

Reagent name molecular formula purity Manufacturer Copper nitrate solution Cu(NO ₃ ) ₂ Analytical pure Sinopharm Chemical Reagent Co., Ltd. sodium hydroxide NaOH Analytical pure Sinopharm Chemical Reagent Co., Ltd. 50% manganese nitrate solution Mn( _NO3)2 50% aqueous solution Sinopharm Chemical Reagent Co., Ltd. n-butyl acrylate C ₇ H ₁₂ O ₂ Analytical pure Sinopharm Chemical Reagent Co., Ltd. Methyl methacrylate C ₅ H ₈ O ₂ Analytical pure Sinopharm Chemical Reagent Co., Ltd. acrylic acid C ₃ H ₄ O ₂ Analytical pure Sinopharm Chemical Reagent Co., Ltd. Sodium thiosulfate Na ₂ S ₂ O ₃ Analytical pure Sinopharm Chemical Reagent Co., Ltd. 98% concentrated sulfuric acid _{H2SO4 _} Analytical pure Sinopharm Chemical Reagent Co., Ltd. potassium iodide KI Analytical pure Sinopharm Chemical Reagent Co., Ltd.

According to the CJ/T3028.2-94 standard for the measurement of ozone concentration, output and power consumption of ozone generators in the urban construction industry standard of the People's Republic of China, the ozone concentration is tested to obtain the ozone decomposition rate.

Example 1

A ceramic purifier for ozone purification in air, that is, a Mn ₃ O ₄ /CuO composite catalyst is loaded on a porous ceramic carrier;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst is calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst: porous ceramic carrier is 7:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

(1) Take 10g Cu/Mn catalyst, 7.27g (solid content 68.77%) polyacrylic acid cream, mix it with 20g water and put it into a sand mill with a rotation speed of 1200r/min and a time of 0.5h to ensure that the raw materials can be fully mixed Afterwards, cross 325 mesh standard sieves, obtain catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, 30g of aluminum oxyhydroxide sol with a solid content of 44.2% was mixed evenly with 45g of the catalyst suspension obtained in step (1) to obtain a catalyst slurry;

(3) Spray the catalyst slurry obtained in (2) onto the porous ceramic carrier with a compressed air spray gun at a controlled pressure of 10Mpa, and then put the sprayed porous ceramic carrier in an oven at 120°C for 20 minutes;

Repeat the above process of spraying and drying until the weight of the porous ceramic carrier increases by 7%, and the porous ceramic carrier loaded with the Mn ₃ O ₄ /CuO composite catalyst is obtained, that is, the ceramic purifier for ozone purification in the air.

Example 2

A ceramic purifier for ozone purification in air, that is, a Mn ₃ O ₄ /CuO composite catalyst is loaded on a porous ceramic carrier;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst is calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst: porous ceramic support is 7.5:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

(1) Take 10g Cu/Mn catalyst, 7.27g (solid content 68.77%) polyacrylic acid cream, mix it with 23g water and put it into a sand mill at a speed of 1200r/min for 1h to ensure that the raw materials can be fully mixed , cross 325 mesh standard sieves to obtain catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, 30g of aluminum oxyhydroxide sol with a solid content of 44.2% was mixed evenly with 40g of the catalyst suspension obtained in step (1) to obtain a catalyst slurry;

(3) Spray the catalyst slurry obtained in (2) onto the porous ceramic carrier with a compressed air spray gun at a controlled pressure of 9Mpa, and then put the sprayed porous ceramic carrier in an oven at 120°C for 20 minutes;

Repeat the above process of spraying and drying until the weight of the porous ceramic carrier is 7.5%, and the porous ceramic carrier loaded with Mn ₃ O ₄ /CuO composite catalyst is obtained, that is, the ceramic purifier for ozone purification in the air.

Example 3

A ceramic purifier for ozone purification in air, that is, a Mn ₃ O ₄ /CuO composite catalyst is loaded on a porous ceramic carrier;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst is calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst: porous ceramic support is 8:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

(1) Take 10g Cu/Mn catalyst, 7.27g (solid content 68.77%) polyacrylic acid cream, mix it with 25g water and put it into a sand mill at a speed of 1200r/min for 1h to ensure that the raw materials can be fully mixed , cross 325 mesh standard sieves to obtain catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, 30g of aluminum oxyhydroxide sol with a solid content of 44.2% was mixed evenly with 40g of the catalyst suspension obtained in step (1) to obtain a catalyst slurry;

(3) Spray the catalyst slurry obtained in (2) onto the porous ceramic carrier with a compressed air spray gun at a controlled pressure of 7Mpa, and then put the sprayed porous ceramic carrier in an oven at 120°C for 20 minutes;

Repeat the above process of spraying and drying until the weight of the porous ceramic carrier increases by 8.0%, and the porous ceramic carrier loaded with the Mn ₃ O ₄ /CuO composite catalyst is obtained, that is, the ceramic purifier for ozone purification in the air.

Example 4

A ceramic purifier for ozone purification in air, that is, a Mn ₃ O ₄ /CuO composite catalyst is loaded on a porous ceramic carrier;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst is calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst: porous ceramic carrier is 7:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

(1) Take 10g Cu/Mn catalyst, 7.27g (solid content 68.77%) polyacrylic acid cream, mix it with 27g water and put it into a sand mill at a speed of 1200r/min for 1h to ensure that the raw materials can be fully mixed , cross 325 mesh standard sieves to obtain catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, 30g of aluminum oxyhydroxide sol with a solid content of 44.2% was mixed evenly with 40g of the catalyst suspension obtained in step (1) to obtain a catalyst slurry;

(3) Spray the catalyst slurry obtained in (2) onto the porous ceramic carrier with a compressed air spray gun at a controlled pressure of 5Mpa, and then put the sprayed porous ceramic carrier in an oven at 120°C for 10 minutes;

Repeat the above process of spraying and drying until the weight of the porous ceramic carrier increases by 7%, and the porous ceramic carrier loaded with the Mn ₃ O ₄ /CuO composite catalyst is obtained, that is, the ceramic purifier for ozone purification in the air.

Example 5

A ceramic purifier for ozone purification in air, that is, a Mn ₃ O ₄ /CuO composite catalyst is loaded on a porous ceramic carrier;

The loading capacity of Mn ₃ O ₄ /CuO composite catalyst is calculated by weight ratio, that is, Mn ₃ O ₄ /CuO composite catalyst: porous ceramic support is 7.5:100.

The above-mentioned preparation method of a ceramic purifier for ozone purification in air specifically comprises the following steps:

A method for assembling a ceramic filter for air purification, specifically comprising the steps of:

(1) Take 10g Cu/Mn catalyst, 7.27g (solid content 68.77%) polyacrylic acid cream, mix it with 23g water and put it into a sand mill at a speed of 1200r/min for 1h to ensure that the raw materials can be fully mixed , cross 325 mesh standard sieves to obtain catalyst suspension;

(2) In order to further increase the adsorption area of the ceramic air filter, 30 g of aluminum oxyhydroxide sol with a solid content of 44.2% was mixed evenly with 30 g of the catalyst suspension obtained in step (1) to obtain a catalyst slurry;

(3) Spray the catalyst slurry obtained in (2) onto the porous ceramic carrier with a compressed air spray gun at a controlled pressure of 9Mpa, and then put the sprayed porous ceramic carrier in an oven at 120°C for 20 minutes;

Repeat the above process of spraying and drying until the weight of the porous ceramic carrier is 7.5%, and the porous ceramic carrier loaded with Mn ₃ O ₄ /CuO composite catalyst is obtained, that is, the ceramic purifier for ozone purification in the air.

Application example

Utilize the air-cleaning ceramic filter of above-mentioned embodiment 1-5 gained to purify the air containing ozone respectively, O in the air containing ozone Concentration is _2500ppm ;

Control the reaction time for 30 minutes, the air flow rate is 60ml/min, the concentration of KI aqueous solution is 0.1g/ml, the concentration of Na ₂ S ₂ O ₃ is 0.05mol/L, according to the ozone concentration and output of the ozone generator in the urban construction industry standard of the People's Republic of China , Measurement of power consumption CJ/T3028.2-94 standard to measure, the results of ozone decomposition efficiency in the air are shown in the table below:

Ceramic purifier for ozone purification in air Degradation efficiency Example 1 90% Example 2 92.5% Example 3 97% Example 4 90% Example 5 96%

It can be seen from the above table that the ceramic purifier for ozone purification in the air can decompose ozone up to 97%, which shows that the ceramic purifier for ozone purification in the air is suitable for air purification and purification. works well.

The foregoing is only an example of the embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and Modifications should also be regarded as the scope of protection of the present invention.

Claims (5)

1. a ceramic purifier for the ozone purification in air, it is characterized in that the ceramic purifier of the ozone purification in described air, namely on cellular ceramic substrate, load has Mn ₃o ₄/ CuO composite catalyst or Mn ₃o ₄/ Fe ₂o ₃composite catalyst;

Mn ₃o ₄/ CuO composite catalyst or Mn ₃o ₄/ Fe ₂o ₃the load capacity of composite catalyst, by weight calculating, i.e. Mn ₃o ₄/ CuO composite catalyst or Mn ₃o ₄/ Fe ₂o ₃composite catalyst: cellular ceramic substrate is 7-8:100.

2. as right to remove as described in 1 a kind of air in the ceramic purifier of ozone purification, it is characterized in that load has Mn on cellular ceramic substrate ₃o ₄/ CuO composite catalyst;

Mn ₃o ₄the load capacity of/CuO composite catalyst, by weight calculating, i.e. Mn ₃o ₄/ CuO composite catalyst: cellular ceramic substrate is 7:100.

3. as right to remove as described in 1 a kind of air in the ceramic purifier of ozone purification, it is characterized in that load has Mn on cellular ceramic substrate ₃o ₄/ CuO composite catalyst;

Mn ₃o ₄the load capacity of/CuO composite catalyst, by weight calculating, i.e. Mn ₃o ₄/ CuO composite catalyst: cellular ceramic substrate is 7.5:100.

4. as right to remove as described in 1 a kind of air in the ceramic purifier of ozone purification, it is characterized in that load has Mn on cellular ceramic substrate ₃o ₄/ CuO composite catalyst;

Mn ₃o ₄the load capacity of/CuO composite catalyst, by weight calculating, i.e. Mn ₃o ₄/ CuO composite catalyst: cellular ceramic substrate is 8:100.

5. the preparation method of the ceramic purifier of the ozone purification in a kind of air as claimed in claim 1, is characterized in that specifically comprising the steps:

(1), by Mn ₃o ₄/ CuO or Mn ₃o ₄/ Fe ₂o ₃composite catalyst: aqueous polyacrylamide acid resin: the mass ratio of water is put into sand mill after the ratio of 1:0.5:2.0-2.7 mixes, and controlling rotating speed is that 1200r/min carries out grinding 30-60min, and then mistake 325 mesh standard sieves, obtain catalyst suspension;

(2), by solid content be hydroxyl oxidize Alumina gel and step (1) the gained catalyst suspension of 44.2% by volume for the ratio of 1:1-1.5 mixes, obtain catalyst pulp;

(3) step (2) gained catalyst pulp is utilized compressed ir spray gun, controlled pressure is that 5-10Mpa is ejected on cellular ceramic substrate, then the cellular ceramic substrate after spraying is put into 100-180 DEG C of baking oven and carries out oven dry 10-20min;

Repeat above-mentioned spraying, the process of oven dry, until stop during cellular ceramic substrate weightening finish 7-8%, obtain the ceramic purifier of the ozone purification in air.