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Preparation method for photocatalyst used for treating volatile organic compounds

A technology of volatile organic compounds and photocatalysts, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve high cost, complicated preparation process, and difficulty in industrial scale-up and other problems, to achieve the effects of wide absorption range, simple preparation steps, and improved catalyst efficiency

Active Publication Date: 2014-01-22
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst uses noble metals as active components, which is expensive, and the preparation process is complicated, making industrial scale-up difficult.

Method used

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  • Preparation method for photocatalyst used for treating volatile organic compounds
  • Preparation method for photocatalyst used for treating volatile organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 10 g of titanyl sulfate, and use 300 g of deionized water to ultrasonically decompose and dissolve it into a solution. Add 10% ammonia water to adjust the pH of the reaction system to 9, precipitate for 15 min, and centrifuge to wash the precipitate until the conductivity of the eluate is below 20 μS / cm. Add 200ml of deionized water to the obtained white precipitate to make a slurry, add 15ml of hydrogen peroxide dropwise, and adjust the pH value to 7 with concentrated ammonia water to obtain a bright yellow transparent titanium sol.

[0033]Add 2 g of polyvinyl alcohol, 2 g of tungsten oxide powder, and 2 g of manganese oxide powder into the titanium sol, stir evenly, add 40 g of aluminum sol, and stir at 4000 rpm for 30 minutes to obtain a coating solution.

[0034] Spray the coating solution on the honeycomb ceramic carrier (model HA-01, CNOOC Tianjin Chemical Research and Design Institute. Carrier weight 200g, size 100*100*40mm, water absorption 10-30%), dry at...

Embodiment 2

[0040] Take 40g of titanyl sulfate, and use 1000g of deionized water to ultrasonically decompose and dissolve it into a solution. Add 5% ammonia water to adjust the pH value of the reaction system to 9, precipitate for 30 min, and centrifuge to wash the precipitate until the conductivity of the eluate is below 20 μS / cm. Add 800 ml of deionized water to the obtained white precipitate to make a slurry, add 60 ml of hydrogen peroxide dropwise, and adjust the pH value to 7 with concentrated ammonia water to obtain a bright yellow transparent titanium sol.

[0041] Add 80 g of polyvinyl alcohol, 16 g of tungsten oxide powder, and 16 g of manganese oxide powder into the titanium sol, stir evenly, and 600 g of aluminum sol, and stir at 12,000 rpm for 60 minutes to obtain a coating solution.

[0042] Spray the coating solution on the honeycomb ceramic carrier (model HA-01, CNOOC Tianjin Chemical Research and Design Institute. Carrier weight 200g, size 100*100*40mm, water absorption 10...

Embodiment 3

[0045] Take 20g of titanyl sulfate, and use 600g of deionized water to ultrasonically decompose and dissolve it into a solution. Add 10% ammonia water to adjust the pH of the reaction system to 8, precipitate for 30 min, and centrifuge to wash the precipitate until the conductivity of the eluate is below 20 μS / cm. Add 400 ml of deionized water to the obtained white precipitate, add 30 ml of hydrogen peroxide dropwise, and adjust the pH value to 7 with concentrated ammonia water to obtain a bright yellow transparent titanium sol.

[0046] Add 4g of polyvinyl alcohol, 4g of copper oxide powder, and 4g of iron oxide powder to the titanium sol, stir evenly, and 40g of aluminum sol, and stir at 8000 rpm for 40 minutes to obtain a coating solution.

[0047] Spray the coating solution on the honeycomb ceramic carrier (model HA-01, CNOOC Tianjin Chemical Research and Design Institute. Carrier weight 200g, size 100*100*40mm, water absorption 10-30%), dry at 80°C for 2hr, and spray repe...

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Abstract

The invention provides a preparation method for a photocatalyst used for treating volatile organic compounds. The preparation method is characterized in that titanium dioxide is used as a main active component, a transition metal is added as an auxiliary agent, and a normal temperature spraying process is employed to load titanium dioxide on a metal or ceramic honeycomb carrier. The preparation method comprises the following concrete steps: A) dissolving titanyl sulfate in deionized water, adjusting a pH value to 7 to 10 by using a 5 to 25% ammonia-water solution, subjecting an obtained white precipitate to centrifugation and washing, mixing and beating the precipitate and deionized water and adjusting the pH value to 7 to 10 by using H2O2 and HCl with stirring so as to obtain a titanium sol; B) adding a surfactant into the titanium sol, adding micro metal oxide powder with stirring, adding a binder and carrying out high-speed shearing and uniform stirring so as to prepare a stable coating solution; and C) uniformly spraying the coating solution on the carrier and drying and roasting the carrier so as to obtain a finished catalyst product. The catalyst prepared by using the method has the characteristics of high volatile organic compound removal efficiency, a long life, easy loading and unloading, a low price, etc.

Description

Technical field: [0001] The invention relates to the field of catalyst manufacture and aims to provide a method for preparing a photocatalyst for treating volatile organic compounds. The catalyst of the present invention is mainly used for gaseous pollutants in volatile organic compounds. Background of the invention: [0002] Volatile Organic Compounds (VOCs for short) are organic compounds with a boiling point between 50°C and 260°C under normal pressure. There are many kinds of VOCs (including aromatic hydrocarbons, esters, aldehydes and phenols, etc.) The placement and use of reagents and medicines, as well as the volatiles of samples, the leakage and emptying of intermediate products in the analysis process, etc., will generate VOCs exhaust gas. Many VOCs have neurotoxicity, kidney and liver toxicity, and even carcinogenicity. They can damage blood components and cardiovascular system, cause gastrointestinal disorders, induce immune system, endocrine system and hematop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/745B01D53/86B01D53/44
CPCY02A50/20
Inventor 苗静于海斌孙彦民滕厚开李晓云曾贤君李世鹏隋云乐周鹏
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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