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Catalyst for eliminating haloaromatic contaminant by catalytic combustion

A catalytic combustion, aromatic technology, used in physical/chemical process catalysts, catalyst carriers, chemical instruments and methods, etc., can solve problems such as loss of activity, poisoning, and reduced catalyst activity.

Inactive Publication Date: 2004-10-13
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

[0003] Generally speaking, noble metal catalysts have high complete catalytic combustion activity for volatile organic pollutants, however, they are not effective for the catalytic oxidation of halogenated aromatic pollutants, mainly because the halogenated aromatic pollutants Halogen or hydrogen halide produced in the process of catalytic combustion causes the poisoning of the noble metal catalyst, thereby reducing or even inactivating the catalyst activity (J.J.Spivey, J.B.Butt, Catal.Today 11(1992) 465)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] TiO 2 -Al 2 o 3 Preparation of composite carrier:

[0012] Prepare a certain amount of titanium precursors such as tetrabutyl titanate, titanyl sulfate or titanium tetrachloride into ethanol or aqueous solution, and place in Al 2 o 3 Carrier, impregnated in a rotary evaporator, evaporated to dryness, hydrolyzed in the air overnight, then dried and roasted, the TiO 2 -Al 2 o 3 Composite carrier. As TiO 2 The amount of content is made into TiO with different coverage 2 -Al 2 o 3 Composite carrier. TA-0.25, TA-0.5, TA-1.0, TA-1.5 represent Al 2 o 3 TiO on support 2 The covering amounts are 4.25wt%, 8.5wt%, 17wt%, 23.5wt%, respectively.

example 2

[0014] Dissolve metal salts in water or ammonia water to prepare impregnation solution, add TiO 2 -Al 2 o 3 、Al 2 o 3 , SiO 2 、TiO 2 , CeO 2 Or honeycomb ceramics, after impregnating, drying, and roasting according to the conventional method, depending on the difference of the catalyst precursor, it is made into a single-component or two-component supported manganese-based metal oxide catalyst.

example 3

[0016] The performance evaluation of complete catalytic combustion of halogenated aromatic pollutants was carried out in an atmospheric fixed-bed quartz tube reactor. Catalyst consumption 1.0 milliliters, particle size 40-60 order, organohalogenated arene pollutant passes inert gas (such as N 2 , Ar, etc.) are bubbled into the catalyst bed (the content of chlorobenzene or dichlorobenzene is 1300ppm), the oxidant used is oxygen, and the gas space velocity is 8000h -1 . The complete catalytic combustion performance of chlorobenzene on manganese-based catalysts loaded on different supports was studied, and the test results are listed in Table 1.

[0017] Table 1 Catalytic performance of manganese-based catalysts supported on different supports for the complete combustion of chlorobenzene

[0018] Chlorobenzene conv.(%)

[0019] Catalyst Temperature(℃)

[0020] 200 250 300 350 400 450 500 550

[0021] MnO x / SiO 2 0 0 ...

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PUM

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Abstract

A catalyst for eliminating haloaromatic contaminant by catalytic combustion is composed of composite TiO2-Al2O3 carrier, manganese oxide as active component (0.1-0.3 wt.%), and transition metal M as assistant (0.1-20 wt.%) chosen from one or several kinds of Cu, V, Ce, Fe, Mo, Zn and Ni. It features high performance to catalytic condustion of chlorobenzene of dichlorobenzene.

Description

technical field [0001] The invention relates to a TiO-based 2 -Al 2 o 3 A manganese-based metal oxide catalyst with a composite carrier and other carriers is used for complete catalytic oxidation to eliminate halogenated aromatic pollutants in the environment, and relates to a preparation method of the catalyst. Background technique [0002] The traditional method of eliminating halogenated aromatic pollutants is direct thermal combustion, which often requires combustion temperatures of 1000 °C or even higher, resulting in more toxic pollutants (polychlorinated dibenzodioxins (PCDD) and polychlorinated dibenzodioxins (PCDD) Chlorodibenzofurans (PCDF), collectively referred to as Dioxins (Dioxins)) formation. Catalytic combustion can be carried out at a lower temperature, which is an energy-saving, economical and effective treatment method. More importantly, this method can effectively treat organic pollutants with very low content (<1%), and this Organic pollutants ca...

Claims

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Application Information

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IPC IPC(8): A62D3/38A62D101/22B01J23/34B01J32/00
Inventor 李灿刘艳魏昭彬辛勤
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI