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Method for keeping activity and stability of catalyst during dehalogenation reaction

A catalyst and stability technology, which is used in the field of maintaining high activity and high stability of catalysts in dehalogenation reactions, can solve problems such as catalyst activity reduction, catalyst poisoning, and stability degradation, and achieve toxicity reduction, pollution elimination, and high stability Effect

Inactive Publication Date: 2006-09-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the heterogeneous catalytic hydrogenation process of organic halides, the generation of hydrogen halides can easily lead to catalyst poisoning and deactivation, resulting in a decrease in catalyst activity and stability until catalyst failure

Method used

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  • Method for keeping activity and stability of catalyst during dehalogenation reaction

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Experimental program
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Effect test

Embodiment 1

[0016] The catalysts used in the reaction process are shown in Table 1, including metal catalysts with different contents, different active components, and different supports.

Embodiment 2、4

[0017] Hydrodehalogenation detoxification in embodiment 2, 4-CP aqueous solution

[0018] Weigh 0.15g of the 5% Pd / C catalyst prepared in Example 1, add it to a 500ml three-neck flask, add 300ml of an aqueous solution of CB with a concentration of 20000ppm, and make the reactant fully adsorbed for 15min under magnetic stirring; then pass N 2 , replace the air in the reactor, and then pass H 2 , replacing N in the reactor 2 , do this three times, and then pass H 2 , H 2 The flow rate was controlled within the range of 10-30ml, the reaction temperature was controlled at 30°C, and the reaction pressure was normal pressure. The specific dechlorination and detoxification results are shown in Table 2.

Embodiment 3

[0019] Example 3, Hydrodehalogenation and detoxification of different organic halogenated compounds

[0020] According to the operation of Example 2, take by weighing 80mg catalyst respectively, measure 150ml of different organic halide solutions of 1% and join in the three-necked flask of 250ml, then logical H 2 , see Table 2 for the specific reaction results.

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Abstract

A method for retaining the activity and stability of catalyst in dehalogenating reaction by regulating the properties of reaction medium features that a metallic catalyst with the active component chosen from Pd, Rh, Pt and Ni is used for the multi-phase catalytic hydrodehalogenating reaction on organic halogenated compound in liquid phase at 10-80 deg.C under 0.05-0.5 MPa.

Description

technical field [0001] The invention relates to a method for eliminating catalyst poisoning and deactivation in liquid phase dehalogenation reaction, in particular to a method for maintaining high activity and stability of catalyst in dehalogenation reaction by adjusting the properties of the reaction medium. Background technique [0002] As an organic synthesis method, heterogeneous catalytic hydrogenation dehalogenation has long been used in the production of fine chemicals, and has recently received increasing attention in environmental protection. It can convert highly toxic or serious environmental pollution that is difficult to treat by conventional methods Halogenated hydrocarbons are converted into low-toxic, easily-disposable or non-toxic reusable compounds; for example, by catalytic hydrodechlorination, it can remove organic Chlorine atoms of environmental pollutants are chlorinated, and chlorinated organics are converted into corresponding alkanes, benzene, biphen...

Claims

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Application Information

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IPC IPC(8): C07B35/06B01J23/40B01J23/755
Inventor 徐杰夏传海梁鑫淼
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI