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Preparation method of waste gas purifying catalyst

A technology for exhaust gas purification and catalyst, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of sulfur poisoning and catalyst performance degradation, and achieve the goal of preventing sulfur poisoning and enhancing sulfur resistance. Effect

Active Publication Date: 2020-03-31
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention: the catalysts such as noble metals such as Pt and Pd commonly used in catalytic combustion of sulfur-containing waste gas are prone to sulfur poisoning, resulting in a decline in catalyst performance, while transition metals such as Cu, Mo and Zn require higher temperatures for catalysis. Pre-improving the sulfur resistance of the active components of the catalyst and reducing the catalytic combustion temperature provides a new preparation method for exhaust gas purification catalysts

Method used

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  • Preparation method of waste gas purifying catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: Weigh 68g of pseudoboehmite (AlOOH 0.5H 2 (2) and 21g cerium nitrate hexahydrate, then weighed 8.04g copper nitrate (the percentage value is 5% by copper oxide mass and carrier mass after loading) and 0.29g platinum nitrate (by the ratio of platinum oxide mass and carrier mass after loading) The percentage value is 0.3%); add 500ml of deionized water and 10ml of dimethyl sulfoxide to the carrier and metal component precursor, shake well, add an appropriate amount of sodium hydroxide aqueous solution to adjust the pH to 7; condense and stir at 80°C 10 hours; use a rotary evaporator to spin-dry; place in an oven to dry at 120°C overnight; after grinding evenly, put it in a muffle furnace and bake at 550°C for 4 hours to obtain 1-Cu-Pt / CeO 2 -Al 2 o 3 , denoted as catalyst 1.

Embodiment 2

[0028] Embodiment 2: Weigh 68g of pseudoboehmite (AlOOH 0.5H 2 (2) and 54g cerium nitrate hexahydrate, then weighed 11.14g copper nitrate (the percentage value of copper oxide mass and carrier mass after loading is 5%) and 0.79g platinum nitrate (the percentage value of platinum oxide mass and carrier mass after loading 0.6%); add 470ml of deionized water and 40ml of dimethyl sulfoxide to the carrier and metal component precursor, shake well, add an appropriate amount of sodium hydroxide aqueous solution to adjust the pH to 8; condense and stir at 90°C for 16 hours ;Use a rotary evaporator to spin-dry; put it in an oven at 120°C for overnight drying; after grinding evenly, put it in a muffle furnace and bake it at 650°C for 6 hours to obtain 2-Cu-Pt / CeO 2 -Al 2 o 3 , denoted as Catalyst 2.

Embodiment 3

[0032] Example 3: The only difference between this embodiment and Example 1 is that only 510ml of water is added and no dimethyl sulfoxide is added, and the others are the same as in Example 1 to obtain 3-Cu-Pt / CeO 2 -Al 2 o 3 , denoted as catalyst 6.

[0033] Adopt following experiment verification effect of the present invention:

[0034]The prepared catalyst was pressed into tablets, ground, and sieved to collect 40-60 mesh catalyst particles, and 0.2 g of catalyst was filled in the middle of a fixed-bed reactor (quartz tube reactor with a diameter of 6.0 mm). Then, the saturated steam of DMDS (dimethyl disulfide) was introduced into the main pipeline by nitrogen bubbling method, and mixed with nitrogen and air. Finally, the oxidation reaction takes place in the fixed bed reactor. The reaction process conditions are as follows: under normal pressure, the reaction temperature rises from 100°C to 550°C, the DMDS concentration is 1000ppm, and the volumetric space velocity ...

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Abstract

A waste gas purifying catalyst. The invention belongs to the technical field of waste gas treatment. A preparation method of the catalyst includes: performing wet-impregnation with a water and dimethyl sulfoxide mixed solution as a solvent to prepare the double-metal supported catalyst Cu-Pt / CeO2-Al2O3. Compared with the prior art, the catalyst shows high catalytic activity under a normal workingcondition and can effectively suppress performance reduction of a catalyst active component due to sulfur in the waste gas. The process is suitable for mass production, has the possibility of industrial production and has extensive application prospect.

Description

technical field [0001] The invention discloses a preparation method of an exhaust gas purification catalyst, which belongs to the technical field of exhaust gas treatment. The exhaust gas purification catalyst can be used for purifying industrial sulfur-containing exhaust gas. Background technique [0002] Exhaust gas containing organic sulfur compounds refers to the exhaust gas containing organic sulfur compounds such as thiophene, mercaptan, and sulfide, and is an important part of VOCs. VOCs are produced in large quantities in processes such as dye manufacturing, pesticide production, paint industry, leather production, landfill and wastewater treatment. If it is directly discharged into the environment without treatment, it will not only cause serious odor pollution, but also seriously endanger human health and ecological balance. [0003] At present, there are many ways to treat waste gas containing organic sulfur compounds, but the following are the most widely used m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/02F23G7/07
CPCB01J23/894B01J37/0201F23G7/07
Inventor 张傑高君安高松李英霞
Owner BEIJING UNIV OF CHEM TECH
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