Catalyst for treating industrial waste water under normal temperature and normal pressure and preparation method thereof

A catalyst and atmospheric pressure technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited industrial application, metal ion dissolution, high removal rate, etc.

Active Publication Date: 2010-07-21
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above catalysts are all catalysts formed by activated carbon or γ-alumina and other carriers supporting metal oxides such as Fe, Cu, Zn, Ni, Co or Mn. The main active component is only one metal oxide. The catalytic activity of the catalyst is and catalytic selectivity is limited at room temperature and pressure, even with H 2 o 2 Together, they can catalyze and oxidize coking wastewater, and the highest COD removal rate can only reach 98%.
In addition, since there is no complex compound (see Catalysis Communications 7 (2006) 478-483, AppliedCatalysis B: Environmental 72 (2007) 205-211) in the catalyst of a single main active component, metal ion stripping occurs easily during use, thereby The catalytic activity of the catalyst is easy to fail and the stability of the catalyst is poor, which greatly limits the industrial application

Method used

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preparation example Construction

[0035] The second and third aspects of the present invention mainly relate to the preparation method of the catalyst. The catalyst of the present invention is mainly prepared by an impregnation precipitation method, which mainly includes: first fully impregnating the carrier with an aqueous solution of a water-soluble salt of a certain metal, and then adding a precipitant to make each metal in a water-soluble form The salt form is precipitated on the support before some subsequent processing. In the practice of the impregnation-precipitation method, a certain metal can be impregnated and precipitated first, and then the rest of the metals can be impregnated or precipitated; Dip precipitation method.

[0036] According to a second aspect of the present invention, in step a of the method of the present invention, the activated carbon is pretreated with steps comprising washing, drying and heat treatment. Those skilled in the art can select the conditions of washing, drying and h...

Embodiment 1

[0056] Example 1 Catalyst loaded with 5% Fe-Cu-Ni ternary composite metal oxide on activated carbon

[0057] The components and content of the catalyst are: the mass percentage of the activated carbon carrier is 95%, and the mass percentage content of the active component Fe-Cu-Ni ternary composite metal oxide is 5%, wherein Fe 2 o 3 , CuO and NiO are respectively 4%, 0.5% and 0.5% by mass of the metal oxide.

[0058] The preparation method of this catalyst comprises the following steps:

[0059] a. Wash the activated carbon with deionized water, dry at 120°C and heat-treat at 150°C for 2 hours to complete the pretreatment, take 190g;

[0060] b. Weigh 27.1g FeCl 3 ·6H 2 O, 2.1g CuCl 2 2H 2 O and 3.2 g NiCl 2 ·6H 2 0. Three metal salts are prepared into solutions with deionized water respectively, and then mixed uniformly, the volume of the mixed solution is 230mL;

[0061] c. After heating the mixed solution to 70°C, add the activated carbon particles pretreated in s...

Embodiment 2

[0066] Example 2 Catalyst supporting 5% Fe-Ni-Mn ternary composite metal oxide on activated carbon

[0067] The components and content of the catalyst are: the mass percent content of the activated carbon carrier is 95%, and the mass percent content of the active component Fe-Ni-Mn ternary composite metal oxide is 5%, wherein Fe 2 o 3 , NiO, MnO 2 The calculated oxide mass percentage contents are respectively 4%, 0.5% and 0.5%.

[0068] The preparation method of this catalyst comprises the following steps:

[0069] A. the pretreatment of gac is with embodiment 1, gets 190g;

[0070] b. Weigh 27.1g FeCl 3 ·6H 2 O, 3.2g NiCl 2 ·6H 2 O and 2.8 g MnCl 2 4H 2 O three kinds of metal salts, be mixed with the mixed solution of 230mL with deionized water;

[0071] c-f. Then complete the preparation of activated carbon-loaded 5% Fe-Ni-Mn ternary composite metal oxide catalyst by impregnation, precipitation, aging, washing, drying and roasting. The experimental conditions are t...

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Abstract

The invention relates to a catalyst for catalyzing and oxidizing waste water under normal temperature and normal pressure. The catalyst comprises active carbon, oxide of Fe and oxides of any two, three or four elements selected from Cu, Zn, Mn, Co, Ni or Ce, wherein the active carbon is used as a carrier, the oxide of Fe is used as a primary active component, and the oxides of any two, three or four elements selected from Cu, Zn, Mn, Co, Ni or Ce are used as secondary active components. The invention also relates to a preparation method of the catalyst.

Description

technical field [0001] The invention relates to a catalyst for catalytic oxidation of industrial wastewater under normal temperature and pressure. Background technique [0002] The application of coal as energy and chemical raw materials has been paid more and more attention. Coal gasification is a clean and efficient coal utilization method, but the coal gasification process produces a large amount of highly polluted wastewater, which contains a variety of pollutants, such as phenol, cyanide, ammonia nitrogen and several aliphatic and aromatic compounds, which need to be treated It must be treated effectively before it can be discharged. [0003] In the field of wastewater treatment, indicators such as chemical oxygen demand (COD), ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, and chromaticity are often used to indicate the type and / or amount of pollutants in wastewater. Among them, COD, also known as chemical oxygen demand, refers to the amount of oxidant consume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/889C02F1/72
CPCB01J37/031B01J21/18C02F1/725B01J35/1023B01J23/8892B01J2523/00B01J35/617B01J2523/72B01J2523/842B01J2523/847B01J2523/17B01J2523/3712
Inventor 万新华张国涛郗名悦李伟杨延红
Owner ENN ENVIROTECH CO LTD
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