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Catalyst for low-temperature catalytic combustion of chlorine-containing organic matter and its preparation method and application

A technology of low-temperature catalysis and organic matter, applied in the direction of physical/chemical process catalysts, combustion methods, chemical instruments and methods, etc., can solve the problems of high-temperature active component loss, high price, and easy chlorine poisoning, and achieve high catalytic activity and preparation Simple, long-lasting effect

Active Publication Date: 2019-10-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing research results show that noble metal catalysts are relatively expensive, have high chlorination reaction activity (and are prone to form more harmful polychlorinated by-products), are prone to chlorine poisoning, high-temperature active component loss, and other inactivation problems, making noble metals Practical applications of catalysts are limited

Method used

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  • Catalyst for low-temperature catalytic combustion of chlorine-containing organic matter and its preparation method and application
  • Catalyst for low-temperature catalytic combustion of chlorine-containing organic matter and its preparation method and application
  • Catalyst for low-temperature catalytic combustion of chlorine-containing organic matter and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 8.0g of ferric sulfate in 200mL of deionized water, slowly add ammonia solution dropwise, adjust the pH value of the solution to 9-10, stir vigorously for 2 hours, leave it at room temperature for 8 hours, then filter with suction, then wash with deionized water until the filtrate is Neutral, the filter cake was dried overnight at 110°C in an oven to obtain orange FeOOH (confirmed by XRD). Finally, FeOOH was put into a muffle furnace and calcined at 500°C for 4 hours in an air atmosphere to obtain Fe 2 o 3 -III Catalyst. Photoelectron spectroscopy and plasmon emission spectroscopy characterizations indicated that Fe 2 o 3 The -III catalyst contains 0.49wt% S, and the infrared spectrogram (KBr pellet) shows that the S species is in the form of bidentate bridge sulfate.

Embodiment 2

[0022] Dissolve 11.12g of ferrous sulfate heptahydrate in 200mL of deionized water, slowly add ammonia solution dropwise, adjust the pH value of the solution to 9-10, stir vigorously for 2 hours, leave it at room temperature for 8 hours, then suction filter, and then wash with deionized water Until the filtrate was neutral, the filter cake was dried overnight at 110°C in an oven to obtain yellow-orange FeOOH (confirmed by XRD). Finally, FeOOH was put into a muffle furnace and calcined at 500°C for 4 hours in an air atmosphere to obtain Fe 2 o 3 -II catalyst. Photoelectron spectroscopy and plasmon emission spectroscopy characterizations indicated that Fe 2 o 3 The -II catalyst contains 1.15wt% S, and the infrared spectrogram (KBr pellet) shows that the S species is in the form of bidentate boiled sulfate.

Embodiment 3

[0024] Take 1.5mL of 0.02g / mL sulfuric acid solution, impregnate 3g of dry orange FeOOH powder in Example 1, let it stand at room temperature for 6h, place it in an oven to dry overnight at 110°C, and then bake it in a muffle furnace at 500°C for 4h in an air atmosphere. end up with SO 4 2- / Fe 2 o 3 catalyst. Photoelectron spectroscopy and plasma emission spectroscopy characterizations indicated that SO 4 2- / Fe 2 o 3 The catalyst contains 1.42wt% S, and the infrared spectrogram (KBr pellet) shows that the S species is in the form of bidentate bridged sulfate.

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Abstract

The invention discloses a catalyst for low-temperature catalytic combustion of chlorine-containing organic matters. A transition metal oxide modified with sulfuric acid is used as a catalyst; the transition metal oxide is zirconium oxide, titanium oxide or ferric oxide; the sulfuric acid exists in the surface of the transition metal oxide in the form of bidentate sulfate; the mass fraction of sulfur element is 0.5-3wt%. The invention also discloses a preparation method for the catalyst and an application thereof in the low-temperature catalytic combustion of the chlorine-containing organic matters. The catalyst made from the transition metal oxide modified with sulfuric acid according to the invention has higher catalytic activity and can catalyze the combustion oxidation of the chlorine-containing organic matters, including chlorine-containing aliphatic hydrocarbon and chlorine-containing arene, under lower temperature; the main combustion products include carbon dioxide, hydrogen chloride and chlorine; no chlorinated product with secondary pollution is formed; the preparation is simple; the cost is low and the service life is long; the catalyst is suitable for treatment of complex industrial waste gas; the catalyst has an application prospect for industrial waste gas treatment.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion of organic compounds, and in particular relates to a catalyst for low-temperature catalytic combustion of chlorine-containing organic substances, a preparation method thereof and an application in low-temperature catalytic combustion of chlorine-containing organic substances. Background technique [0002] Chlorine-containing organic compounds mainly include aromatic hydrocarbon chlorides (such as chlorobenzene, dichlorobenzene) and non-aromatic hydrocarbon chlorides, such as dichloromethane (DCM), chloroform (CHCl 3 ), dichloroethane (DCE) and trichloroethylene (TCE), etc. Chlorine-containing organic compounds can cause serious harm to the environment and human health, can cause lasting and cumulative effects on biological systems, and can destroy the atmospheric ozone layer. The 12 top persistent organic pollutants listed in the United Nations Environment Program International Treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053F23G7/07
Inventor 张瑧王幸宜戴启广
Owner EAST CHINA UNIV OF SCI & TECH
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