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Preparation method of reproducible catalyst for efficient catalytic decomposition of methyl mercaptan

Active Publication Date: 2017-08-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first two types of catalysts generally have the problem of easy deactivation (such as HZSM-5 molecular sieve after 6 hours of online reaction, the catalyst begins to deactivate; nano-CeO 2 Catalytic decomposition of methyl mercaptan life only 10h)
After the modification of HZSM-5 rare earth, the catalytic life is significantly improved, and the complete conversion life of methyl mercaptan can last for more than 60 hours, but the catalyst reactivity has not been significantly improved, and the complete conversion of methyl mercaptan can only be achieved at 550 ° C

Method used

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  • Preparation method of reproducible catalyst for efficient catalytic decomposition of methyl mercaptan
  • Preparation method of reproducible catalyst for efficient catalytic decomposition of methyl mercaptan
  • Preparation method of reproducible catalyst for efficient catalytic decomposition of methyl mercaptan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the commercially available MCM-41 molecular sieve into a muffle furnace, and bake it at 550°C for 5h, and set it aside. The equal-volume impregnation method is used to load the active component chromium (Cr) element. Weigh 0.2g of roasted MCM-41 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 1.25g, and 0.2697g of analytical pure hexahydrate chlorinated Dissolve chromium in 6.25g of deionized water, stir, after it is completely dissolved, add 1g of roasted MCM-41 into the chromium chloride solution, stir evenly, make it fully soaked and absorbed for 12 hours, then dry at 90°C for 6 hours Move it into a muffle furnace and bake it at 550°C for 5 hours to obtain a 5wt% Cr / MCM-41 catalyst containing chromium as the active component.

[0026] Sieve the prepared catalyst to 40-60 mesh, and pack it in the reactor, th...

Embodiment 2

[0030] Put the commercially available MCM-41 molecular sieve into a muffle furnace, and bake it at 550°C for 5h, and set it aside. The equal-volume impregnation method is used to load the active component chromium (Cr) element. Weigh 0.2g of roasted MCM-41 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 1.25g, and 0.4155g of analytical pure hexahydrate chlorinated Dissolve chromium in 6.25g of deionized water, stir, after it is completely dissolved, add 1g of roasted MCM-41 into the chromium chloride solution, stir evenly, make it fully soaked and absorbed for 12 hours, then dry at 90°C for 6 hours Move it into a muffle furnace and bake it at 550°C for 5 hours to obtain a 7.5wt% Cr / MCM-41 catalyst containing chromium as the active component.

[0031] Sieve the prepared catalyst to 40-60 mesh, and pack it in the reactor, ...

Embodiment 3

[0034]Get 0.2g of commercially available MCM-41 molecular sieve (without any modification treatment) and fill it in the reactor. The reaction conditions for the decomposition of methyl mercaptan are the same as in Example 1. The conversion rate of methyl mercaptan is 0, and the catalytic activity Such as figure 1 As shown, the XRD pattern is as image 3 shown.

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Abstract

The invention discloses a preparation method of a reproducible catalyst for efficient catalytic decomposition of methyl mercaptan. The preparation method comprises uniformly dipping a roasted mesoporous molecular sieve into a chromium-containing compound solution and carrying out drying and calcination to obtain a finished product. The catalyst has catalytic activity and a catalysis life obviously higher than those of an unmodified mesoporous molecular sieve. The catalyst can be used for multiple regeneration recycling processes and the methyl mercaptan catalytic decomposition performances of the used catalyst can be recovered to a fresh catalyst level. The preparation method has a good industrial application prospect.

Description

technical field [0001] The invention relates to a catalyst preparation method for regenerable and highly efficient catalytic decomposition of methyl mercaptan, belonging to the technical field of malodorous gas treatment. Background technique [0002] As a special volatile organic compound (Volatile Organic Compounds, VOCs), methyl mercaptan is easy to accumulate in the air to form organic aerosols, leading to serious air pollution problems such as atmospheric photochemical smog and smog. Methyl mercaptan also has a low olfactory threshold, high toxicity, and high corrosion properties, which can cause anesthesia of the human nervous system; if it works for a long time or lives in a high-concentration environment, it will cause respiratory system problems, and in severe cases, it will cause respiratory paralysis. At the same time, the high acidity of methyl mercaptan will corrode the reaction equipment. In addition, methyl mercaptan comes from a wide range of sources, mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J29/90B01D53/86B01D53/72
CPCB01D53/8668B01J29/78B01J29/90B01D2257/306B01J2229/18
Inventor 罗永明陈定凯张黎明赵雨桐何德东陈然何昱轩陆继长钟丽萍刘峰
Owner KUNMING UNIV OF SCI & TECH
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