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Catalyst for catalytic oxidation of halogenated hydrocarbon and preparation method thereof

A catalytic oxidation and catalyst technology, which is applied to the catalyst for catalytic oxidation of halogenated hydrocarbons and the field of preparation thereof, can solve the problems of high decomposition temperature of chlorine-containing alkanes, complex preparation process, low catalytic efficiency, etc., and achieves improved catalyst performance and simple preparation process. , the effect of low cost of preparation of raw materials

Active Publication Date: 2018-01-26
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of existing gas-phase catalyzed chlorinated hydrocarbon catalysts, such as complicated preparation process, low catalytic efficiency, deactivation caused by chlorine poisoning, too high decomposition temperature of chlorinated alkanes, too many by-products, etc. , to provide a catalyst capable of efficiently catalyzing the oxidation of chlorinated alkanes at a relatively low temperature and a preparation method thereof

Method used

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  • Catalyst for catalytic oxidation of halogenated hydrocarbon and preparation method thereof
  • Catalyst for catalytic oxidation of halogenated hydrocarbon and preparation method thereof
  • Catalyst for catalytic oxidation of halogenated hydrocarbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] ①Ga(NO 3 ) 3 ·8H 2 O, Fe(NO 3 ) 3 9H 2 O, Cr(NO 3 ) 3 9H 2 O and citric acid were weighed in Ga(NO 3 ) 3 ·8H 2 O 0.04g, Fe(NO 3 ) 3 9H 2 O 2.79g, Cr(NO 3 ) 3 9H 2 O5.20g, citric acid 8.40g, add 100ml deionized water, stir in 50°C water bath for 30min to dissolve. Then the above mixture was continuously stirred at 90 °C for 4 h to form a brown gel. Cool at room temperature, dry at 120°C for 12h, and finally bake at 600°C for 4h in an air atmosphere to obtain the catalyst carrier Cr of the present invention. 1.3 Fe 0.69 Ga 0.01 o 3 .

[0014] ② The structure of the catalyst carrier is shown in the attached figure. figure 1 for Cr 1.3 Fe 0.69 m 0.01 o 3 (M=Ga, In, Tl or La) catalyst XRD pattern, after comparing the XRD standard card, the crystal phase of the synthesized compound is highly consistent with the standard card PDF-35-1112, indicating that the synthesized sample is Cr with corundum structure 1.3 Fe 0.7 o 3 type of compound, and there...

Embodiment 2

[0017] ①In(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Cr(NO 3 ) 3 9H 2 O and citric acid according to the molar ratio of 0.01:0.69:1.3:4, weigh In(NO 3 ) 3 ·6H 2 O 0.04g, Fe(NO3 ) 3 9H 2 O 2.79g, Cr(NO 3 ) 3 9H 2 O5.20g, citric acid 8.40g, add 100ml deionized water, stir in 50°C water bath for 30min to dissolve. Then the above mixture was continuously stirred at 90 °C for 4 h to form a brown gel. Cool at room temperature, dry at 120°C for 12h, and finally bake at 600°C for 4h in an air atmosphere to obtain the catalyst carrier Cr of the present invention. 1.3 Fe 0.69 In 0.01 o 3 .

[0018] ② The structure of the catalyst carrier is the same as in Example 1.

[0019] ③ The catalyst support activity evaluation conditions are the same as in Example 1.

Embodiment 3

[0021] ①La(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Cr(NO 3 ) 3 9H 2 According to the molar ratio of O and citric acid, La(NO 3 ) 3 ·6H 2 O 0.04g, Fe(NO 3 ) 3 9H 2 O 2.79g, Cr(NO 3 ) 3 9H 2 O5.20g, citric acid 8.40g, add 100ml deionized water, stir in 50°C water bath for 30min to dissolve. Then the above mixture was continuously stirred at 90 °C for 4 h to form a brown gel. Cool at room temperature, dry at 120°C for 12h, and finally bake at 600°C for 4h in an air atmosphere to obtain the catalyst carrier Cr of the present invention. 1.3 Fe 0.69 La 0.01 o 3 .

[0022] ② The structure of the catalyst carrier is the same as in Example 1.

[0023] ③ The catalyst support activity evaluation conditions are the same as in Example 1.

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Abstract

The invention discloses a catalyst for catalytic oxidation of halogenated hydrocarbon and a preparation method thereof. The catalyst consists of a carrier with a corundum structure and an active noble-metal component, wherein the carrier is Cr1.3Fe0.69M0.01O3, and M is Ga, In, Ti or La; and the active noble-metal component is noble metal Rh, Pt or Ir, and the mass percentage of the noble metal is0.5% of that of the carrier. The catalyst is prepared by the steps of adopting a citric-acid complex method to prepare the carrier Cr1.3Fe0.69M0.01O3, and then adopting an isovolumetric impregnation method to load the active component onto the carrier. The catalyst disclosed by the invention has the advantages that high-efficiency catalytic oxidation can be carried out on the chloride-containing alkane at a lower temperature, no other chloride-containing organic intermediate is contained in a product, and the stability is high.

Description

technical field [0001] The invention relates to a chemical catalyst and its preparation method, in particular to a catalyst for catalytic oxidation of halogenated hydrocarbons and its preparation method Background technique [0002] Dichloromethane (Dichloromethane, CH 2 Cl 2 , referred to as DCM), is a typical chlorine-containing volatile organic compound. and dichloroethane (Dichloroethane, C 2 h 4 CCl 2 , referred to as DCE) and trichloroethylene (Trichloroethylene, C 2 HCl 3 , referred to as TCE) are important chemical raw materials and reaction intermediates. Because of its strong solvency, it is widely used in the manufacture of safety film, paint solvents, metal degreasing agents, gas mist sprayers, polyurethane foaming agents, mold release agents, paint removers, etc. But while its demand is increasing day by day, the problem of environmental pollution also follows. Because dichloromethane not only accumulates in groundwater, but also can photochemically rea...

Claims

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Application Information

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IPC IPC(8): B01J23/89
Inventor 鲁继青张婷婷陈家喜
Owner ZHEJIANG NORMAL UNIVERSITY
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