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Catalyst for hydrodehalogenation of arene halide and its prepn and application

A technology for hydrodehalogenation and halogenated aromatics, which is applied to catalyst supports, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., and can solve the problems of expensive precious metals, poisoning, deactivation, etc. , to achieve low cost, strong bioaccumulation, and good practicability

Inactive Publication Date: 2004-11-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the halogen or hydrogen halide produced in the dehalogenation process will poison them and quickly deactivate them, and the preparation of this catalyst requires a large amount of expensive noble metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Catalyst preparation

[0023] Dissolve the metal salt in water to form an impregnation solution of the required concentration, add activated alumina, silica gel, activated carbon and other carriers pretreated with dilute nitric acid, impregnate for 24 hours under reduced pressure, and then dry at a constant temperature of 80°C, then Dehydrate at 120°C for 3 hours under reduced pressure, and cool naturally. One-component or two-component supported metal catalysts with different loads and components are made respectively. Before the reaction, take a certain amount of catalyst in a quartz tube, reduce and activate in pure hydrogen or nitrogen-hydrogen mixed gas at 4°C / min, heat up to 450°C, reduce at constant temperature for 2 hours, cool naturally to room temperature and add to the reaction liquid under nitrogen protection carry out reductive dehalogenation.

Embodiment 2

[0025] Effect of Support on Ni-Based Catalyst for Hydrodechlorination of Chlorobenzene

[0026] The catalytic hydrogenation degradation performance evaluation of organic halogenated aromatic hydrocarbon pollutants is carried out in a 300ml high-pressure reactor, the catalyst dosage is about 0.2-4.0g, and the main active component Ni content is about 0.04g, and the organic halogenated aromatic pollutants can be directly Dehalogenate or dissolve in a suitable solvent (100ml of ethanol solution containing chlorobenzene 51370ppm), about 2.0g of NaOH is used to absorb the hydrogen halide produced in the reaction, and the hydrogen pressure is 10.1×105 Pa, the reaction is carried out at a constant volume at 70°C, and the reaction time is 60 minutes. The catalytic hydrogenation performance of Ni-based catalysts with different supports under the same conditions was studied, and the test results are listed in Table 1.

[0027] Table 1 Chlorobenzene catalytic hydrodechlorination performa...

Embodiment 3

[0031] Catalytic Hydrodechlorination Performance of Ni / C Catalysts with Different Loading Amounts of Chlorobenzene

[0032] Under the same reaction conditions as Example 2, the Ni / C catalysts with different loadings were tested for catalytic hydrodechlorination of chlorobenzene, and the comparison results are listed in Table 2.

[0033] Table 2 Catalytic hydrodechlorination performance of Ni / C catalysts with different loadings of chlorobenzene

[0034] catalyst

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PUM

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Abstract

The present invention relates to supported noble catalyst, and is especially one kind of catalyst for hydrodehalogenation of arene halide and its preparation and application. The catalyst consists of carrier and active component, the carrier is one or several selected from Al2O3, SiO2, active carbon and TiO2, and the active component is mainly Ni in the supported amount of 0.1-30 wt%. The active component exists in the catalyst as metal, metal oxide or other form. The present invention has high catalytic activity, mild reaction condition and simple reaction system, and provides one economic, practical and environment friendly organic aromatic halide pollutant degrading method.

Description

technical field [0001] The invention relates to a supported non-noble metal catalyst, in particular to a catalyst for hydrodehalogenation of halogenated aromatic hydrocarbons and its preparation and application. Background technique [0002] In recent years, the comprehensive treatment of volatile halogenated aromatic hydrocarbon pollutants including Polychlorinated Biphenyls has received more and more attention. The traditional method to eliminate halogenated aromatic pollutants is the incineration method, which often requires a combustion temperature higher than 1000°C and consumes a large amount of organic fuel. Combustion will result in more toxic pollutants dioxins (Dioxin s ) (including polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs)). The catalytic combustion method can directly process halogenated aromatic pollutants without adding fuel, but it is only suitable for treating pollutants with low content (<1%) and difficult to recyc...

Claims

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Application Information

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IPC IPC(8): A62D3/37A62D101/22B01D53/72B01D53/88B01J23/755B01J23/83B01J23/89B01J32/00C07C1/26
Inventor 徐杰吴文海
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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