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Catalytic oxidation protective agent for sulfur-containing organic exhaust gas, and preparation method and application thereof

A technology for catalytic oxidation and organic waste gas, applied in catalyst protection, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of excessive exhaust gas concentration, poor sulfur resistance, and high cost, and achieve extended service life and stability. Good, easy-to-use effects

Pending Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the active metals for VOCs removal and desulfurization active components are combined together, so that the catalyst must be replaced after deactivation, and the cost is high
[0007] At present, because inferior crude oil produces more sulfides in the refining process, these sulfides have a great impact on the catalytic oxidation device of the exhaust gas of the sewage treatment plant of the refining and chemical enterprise, and the sulfur resistance of the existing catalytic oxidation catalyst is poor , cannot effectively convert these hydrogen sulfide and organic sulfur, and the activity of the catalytic oxidation catalyst is inhibited, causing the concentration of exhaust gas to exceed the standard

Method used

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  • Catalytic oxidation protective agent for sulfur-containing organic exhaust gas, and preparation method and application thereof
  • Catalytic oxidation protective agent for sulfur-containing organic exhaust gas, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take a certain amount of urea and dissolve it in 50mL of 0.3mol / L nitric acid solution. After mixing evenly, the pH is 3.5. Add 15g of anatase nano-TiO 2 , TiO was obtained after stirring for 2.5h 2 slurry;

[0030] (2) Add the slurry prepared in step (1) to 200g of silica sol, add 3.5g of polyvinyl alcohol, 1.2g of carboxymethyl cellulose, and ball mill for 6 hours to obtain a coating slurry;

[0031] (3) Immerse the 200 holes / square inch cordierite honeycomb matrix into the coating slurry, take it out after 5 minutes, purge it, and dry it at 100°C for 5 hours to prepare the loaded SiO 2 -TiO 2 Composite honeycomb carrier;

[0032] (4) Immerse the carrier prepared in step (3) into the active metal salt solution, firstly immerse in the mixed solution of 8% ferric nitrate and 6% cerium nitrate (calculated by metal mass), remove after 5 minutes of immersion, and purge, Dry at 100°C for 6 hours, then bake at 200°C for 5 hours; then soak in 6% ammonium metavanadate ...

Embodiment 2

[0035] The preparation process and operating conditions are the same as in Example 1. The difference is that the second impregnation solution in step (4) is in a mixed solution (calculated by metal mass) containing 3% ammonium metatungstate. Finally, the catalytic oxidation protection agent B is obtained. In the protective agent B, the mass of the honeycomb matrix accounted for 84.6% of the mass of the protective agent; SiO 2 -TiO 2 The mass of the composite carrier accounts for 11.4% of the mass of the protective agent; among the active metal oxides, Fe accounts for 2.0% of the mass fraction of the protective agent, Ce accounts for 1.3% of the mass fraction of the protective agent, and W accounts for the mass fraction of the protective agent. The score is 0.7%.

Embodiment 3

[0037] The preparation process and operating conditions are the same as in Example 1. The difference is that the second impregnation solution in step (4) is in a mixed solution (calculated by metal mass) containing 5% ammonium metavanadate and 3% ammonium metatungstate. Finally, the catalytic oxidation protection agent C is obtained. In the protective agent C, the mass of the honeycomb matrix accounted for 84.0% of the mass of the protective agent; SiO 2 -TiO 2 The mass of the composite support accounts for 11.4% of the mass of the protective agent; among the active metal oxides, Fe accounts for 1.6% of the mass fraction of the protective agent, Ce accounts for 1.1% of the mass fraction of the protective agent, and V accounts for the mass fraction of the protective agent. The score is 1.4%. , W accounts for 0.5% of the mass fraction of the protective agent.

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Abstract

The invention relates to a preparation method for a catalytic oxidation protective agent used for sulfur-containing organic exhaust gas. The preparation method comprises the following steps: (1) dissolving urea in an inorganic acid solution, carrying out uniform mixing and adding TiO2 to prepare slurry; (2) adding the prepared slurry into silicon sol and / or aluminum sol, adding an adhesive agent,and then carrying out ball milling to obtain coating slurry; (3) immersing a honeycomb substrate into the coating slurry, taking the honeycomb substrate out, blowing away residual slurry and carryingout drying to obtain a composite honeycomb carrier loaded with SiO2-TiO2 or Al2O3-TiO2 or SiO2-Al2O3-TiO2; and (4) impregnating the composite honeycomb carrier in an active metal salt solution containing Fe and Ce, and then impregnating the composite honeycomb carrier in an active metal salt solution containing V and / or W so as to eventually prepare the protective agent. The catalytic oxidation protective agent prepared by the invention can completely convert hydrogen sulfide and organic sulfide in the exhaust gas, and has the characteristics of good low-temperature desulfurization activity, small pressure drop resistance, low treatment cost and the like.

Description

technical field [0001] The invention belongs to the technical field of waste gas purification, and in particular relates to a catalytic oxidation protection agent for sulfur-containing organic waste gas and a preparation method thereof. Background technique [0002] Sulfur-containing volatile organic compounds are widely found in waste gas from petroleum refining and petrochemical industries. For example, the waste gas discharged from sewage treatment plants of petrochemical enterprises contains volatile organic compounds and sulfides, among which sulfides include hydrogen sulfide, methyl mercaptan, and ethyl mercaptan. , methyl sulfide, ethyl sulfide, carbonyl sulfide, dimethyl disulfide and other organic sulfides. These foul-smelling gases can seriously irritate people's sense of smell, cause unpleasantness or disgust, and have serious harm to human health. [0003] At present, there are many ways to deal with volatile organic compounds (VOCs), among which catalytic oxida...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J33/00B01J35/04B01D53/86B01D53/52B01D53/48
CPCB01D53/8606B01D53/8612B01J33/00B01D2257/306B01D2258/02B01J35/56
Inventor 陈高升王学海陈玉香王宽岭程明珠刘淑鹤刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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