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Application of waste SCR catalyst in preparation of silicon dioxide-titanium dioxide composite photocatalyst

A technology of SCR catalyst and titanium dioxide, which is applied in the field of waste resource recycling, can solve the problems of complex recycling methods, low economic benefits, waste, etc., and achieve high social and economic significance

Pending Publication Date: 2021-07-23
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first option has a greater impact on the environment, and the waste is serious, and it is the least advisable
The second and third types have low economic benefits and complicated processes, and the research significance is not great
However, because the specific recycling method is very complicated and the required recycling conditions are quite harsh, there are defects, and there is no actual production at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A SiO 2 -TiO 2 Composite photocatalyst, the preparation method of described catalyst comprises the following steps:

[0060] (1) The specific process of cleaning the surface of the waste SCR catalyst in the early stage includes blowing the dust attached to the surface with a high-pressure air gun, soaking the surface with 5% dilute sulfuric acid for 2 hours, and then rinsing with water for 2-3 times, the surface is neutral , and then dry it in an oven at 105°C for 2 hours, grind it to a size above 200 mesh with a ball mill, and then dry and grind it to a powder of 100-325 mesh;

[0061] (2), take 6.26g of concentrated sulfuric acid in a beaker, put the above 6.8g of waste SCR catalyst powder in step (1) into the beaker, then add 6g of concentrated sulfuric acid, heat up to 200°C, and react for 3 hours to obtain Solution A of titanyl;

[0062] (3) Slowly add 100mL of a solution containing 21 grams of water glass with a modulus of 3 to the solution A containing titanyl...

Embodiment 2

[0065] A SiO 2 -TiO 2 Composite photocatalyst, the preparation method of described catalyst comprises the following steps:

[0066] (1) The specific process of cleaning the surface of the waste SCR catalyst in the early stage includes blowing the dust attached to the surface with a high-pressure air gun, soaking the surface with 5% dilute sulfuric acid for 2 hours, and then rinsing with water for 2-3 times, the surface is neutral , and then dry it in an oven at 105°C for 2 hours, and grind it into a powder of 100-325 mesh;

[0067] (2), take 12.26g of concentrated sulfuric acid in a beaker, heat it to 200°C, put 6.8g of waste into the beaker, and react for 3 hours to obtain a solution A containing titanyl sulfate;

[0068] (3) Slowly pour 100 mL of sodium silicate solution with a concentration of 2.5 mol / L into solution A containing titanyl sulfate under stirring for hydrolysis reaction; keep 100°C during the reaction, keep stirring, add ammonia water to adjust pH to 2.0; c...

Embodiment 3

[0071] A SiO 2 -TiO 2 Composite photocatalyst, the preparation method of described catalyst comprises the following steps:

[0072] (1) The specific process of cleaning the surface of the waste SCR catalyst in the early stage includes blowing the dust attached to the surface with a high-pressure air gun, soaking the surface with 10% oxalic acid for 2 hours, and then rinsing with water for 2-3 times. The surface is neutral. Then dry it in an oven at 105°C for 2 hours, and grind it into a powder of 325 mesh through a ball mill;

[0073] (2), take 50g of concentrated sulfuric acid in a beaker, heat to 200 ° C, put 28 grams of waste into the beaker, and react for 3 hours to obtain a solution A containing titanyl sulfate;

[0074] (3) Slowly pour 200mL of saturated water glass solution with a modulus of 3.2 into solution A containing titanyl sulfate under stirring to carry out hydrolysis reaction, keep 85°C to 95°C during the reaction, keep stirring, add Adjust the pH to 2.0 wit...

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PUM

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Abstract

The invention provides application of a waste SCR catalyst in preparation of a silicon dioxide-titanium dioxide composite photocatalyst, and relates to the technical field of waste resource recycling. According to the invention, the waste SCR catalyst is used as a raw material, and the waste SCR catalyst is prepared into the SiO2-TiO2 composite photocatalyst product with higher industrial added value, so that the SiO2-TiO2 composite photocatalyst product is used for degrading organic pollutants in the environment and has higher social and economic significance. The photocatalyst has relatively good photocatalytic performance, and experiments verify that rhodamine B can be completely degraded within 30 minutes under the irradiation of ultraviolet light, and the photocatalytic performance of the photocatalyst under visible light is superior to the catalytic effect of German Digosa P25 nano titanium dioxide.

Description

technical field [0001] The invention relates to the technical field of waste resource recovery and utilization, in particular to the application of a waste SCR catalyst in the preparation of a silicon dioxide-titania composite photocatalyst. Background technique [0002] Most thermal power plants in my country currently use flue gas denitrification devices, which use SCR (Urea-based Selective Catalytic Reduction) technology to convert nitrogen oxides into environmentally harmless N 2 and O 2 . This method has high denitrification efficiency and low cost, and is currently the NO X Mainstream technology of control technology. [0003] The main components of the SCR catalyst are: vanadium pentoxide (main active component), titanium dioxide (carrier), tungsten trioxide or molybdenum trioxide (additive), and the content of titanium dioxide is generally about 80% to 85%. The principle of technical denitrification is: under the action of a catalyst, ammonia is injected into the...

Claims

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Application Information

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IPC IPC(8): B01J21/08C02F1/32C02F101/38
CPCB01J21/08C02F1/32C02F2305/10C02F2101/38B01J35/39
Inventor 敖卫华丁浩孙思佳钱玺姜春雨蒋加诚
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)