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Method for regenerating (RE/HZSM-5) catalysts for resolving methanethiol gas

A catalyst, methyl mercaptan technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as waste liquid generation, water source pollution, environmental secondary pollution, etc., achieve good repeatability, eliminate Pollution, cost saving effects

Inactive Publication Date: 2016-01-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Washing regeneration is easy to operate, but it will pollute the water source; acid treatment is efficient and easy to operate, but there will be waste liquid, which will cause secondary pollution to the environment

Method used

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  • Method for regenerating (RE/HZSM-5) catalysts for resolving methanethiol gas
  • Method for regenerating (RE/HZSM-5) catalysts for resolving methanethiol gas
  • Method for regenerating (RE/HZSM-5) catalysts for resolving methanethiol gas

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This implementation takes the deactivated 5wt%La / HZSM-5 catalyst as the treatment object, and the specific steps are as follows:

[0029] (1) Preparation of 5wt%La / HZSM-5 catalyst: put 5 grams of commercially available HZSM-5 molecular sieve with a silicon-aluminum ratio (Si / Al) of 25 into a muffle furnace, and bake it at 550°C for 5 hours, and set aside; Use the equal volume impregnation method to load the active component lanthanum (La) element; pre-weigh 1 gram of HZSM-5 and drop deionized water on the watch glass to determine the ability of the carrier to absorb the solution, and determine the water required to completely impregnate the carrier Dissolve 0.8204 grams of analytically pure lanthanum nitrate hexahydrate in 5.2 grams of deionized water, stir, and after completely dissolving, add 5 grams of pretreated HZSM-5 to this lanthanum nitrate solution, stir evenly, and Immerse for 12 hours to make it fully absorbed, then dry it at 80°C for 5 hours, move it into a ...

Embodiment 2

[0033] This implementation takes the deactivated 13wt%La / HZSM-5 catalyst as the treatment object, and the specific steps are as follows:

[0034](1) Preparation of 13wt% La / HZSM-5 catalyst: Put 5 grams of commercially available HZSM-5 molecular sieve with a silicon-to-aluminum ratio (Si / Al) of 25 into a muffle furnace, and bake it at 560°C for 4.5 hours, and set aside. The equal volume impregnation method is used to load the active component lanthanum (La) element. Weigh 1 gram of HZSM-5 in advance and add deionized water dropwise on the watch glass to determine the ability of the carrier to absorb the solution. It is determined that 1.04 grams of water is needed to completely impregnate the carrier. Dissolve 2.6331 grams of analytically pure lanthanum nitrate hexahydrate in 5.2 Add 5 grams of deionized water, stir, and after it is completely dissolved, add 5 grams of pretreated HZSM-5 to the cerium salt solution, stir evenly, soak at room temperature for 13 hours to make it f...

Embodiment 3

[0040] This implementation takes the deactivated 5wt%Ce / HZSM-5 catalyst as the treatment object, and the specific steps are as follows:

[0041] (1) Preparation of 5wt% Ce / HZSM-5 catalyst: Put 5 grams of commercially available HZSM-5 molecular sieve with a silicon-to-aluminum ratio (Si / Al) of 25 into a muffle furnace and calcinate at 540°C for 5.2 hours, and set aside. The equal volume impregnation method is used to load the active component cerium (Ce) element. Weigh 1 gram of HZSM-5 in advance and add deionized water dropwise on the watch glass to determine the ability of the carrier to absorb the solution. It is determined that the water needed to completely impregnate the carrier is 1.04 grams. Dissolve 0.8155 grams of analytically pure cerium nitrate hexahydrate in 5.2 Add 5 g of pretreated HZSM-5 to the cerium salt solution, stir evenly, and soak it at room temperature for 12.5 hours to fully absorb it, and then dry it at 90°C for 4 hours Then move it into a muffle furn...

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Abstract

The invention discloses a method for regenerating (RE / HZSM-5) catalysts for resolving methanethiol gas, which belongs to the treatment technical field of malodorous gas, wherein catalysts which are inactivated in normal pressure are regenerated, and are treated by using air, pure oxygen or inert gases containing water steam (1%-30%) to regenerate. The method for regenerating the RE / HZSM-5 catalysts for resolving methanethiol gas simply regenerates RE / HZSM-5 catalysts, can obtain excellent stability and activity, can obtain excellent stability for many times, and achieves the effects of excellent activity and stability. The method for regenerating the RE / HZSM-5 catalysts for resolving the methanethiol gas can recover regenerated catalysts to the decomposition performance of methyl mercaptan to the level of fresh catalysts, thereby enabling the regeneration process to have operability and repeatability. The method for regenerating the RE / HZSM-5 catalysts for resolving the methanethiol gas has excellent application prospect.

Description

Technical field [0001] The invention involves a regeneration method of RE / HZSM-5 catalyst that breaks down nailulne gases, which belongs to the field of vulnerability gas treatment technology. Background technique [0002] Metulseol (CH 3 SH) is one of the most representative volatile acids. It has rotten onion flavor and is called "the most unpleasant gas in the world". Its sniffing threshold is very low, 0.0021ppm.CH 3 SH mainly comes from chemical plants, urban sewage treatment plants, poultry slaughter or farms, etc., which are characterized by high toxicity, high corrosion, insoluble water.CH 3 SH can cause headaches, nausea, and different degrees of anesthesia after inhalation. When inhaling high concentration, it can cause respiratory palsy and death.Causes serious pollution to the environment and serious damage to human health.In our country, with the rapid development of the economy, the process of urbanization continues to accelerate. Due to the incompleteness of urban ...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J29/40
Inventor 罗永明陈然万耿平何素芳何德东郝湖生陈定凯陆继长王晶雷艳秋
Owner KUNMING UNIV OF SCI & TECH
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