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Modified active carbon catalyst, and preparation and application thereof

A technology of catalyst and activated carbon, which is applied in the field of water treatment technology and environmental functional materials, can solve the problems of few researches on catalysts, and achieve the effects of low production cost, large specific surface area, and easy industrialization

Active Publication Date: 2016-01-27
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

At present, activated carbon is still mostly used as an adsorbent or a catalyst for gas absorption, but there is little research on it as a catalyst in catalytic wet hydrogen peroxide oxidation technology.

Method used

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  • Modified active carbon catalyst, and preparation and application thereof
  • Modified active carbon catalyst, and preparation and application thereof

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Experimental program
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Effect test

Embodiment approach

[0017] The invention uses a fixed-bed reactor to carry out the experiment of CWPO treatment of coal gasification wastewater. Using TOC-V produced by Shimadzu Corporation CPH / CPN The analyzer measures wastewater TOC. The COD of wastewater was determined by the GB11914-89 potassium dichromate method. The pH of the water samples was measured with a Lei Magnetic PHS-3C precision pH meter. BOD analysis of water samples using BODTrakTM instrument produced by Hach Company 5 . The water quality of coal gasification wastewater was used in the experiment: TOC: 1813mg / L, COD: 6460mg / L, BOD 5 / COD Cr :0.06,pH:9.30.

[0018] Continuous reaction: the initial pH is 3.0~7.0, add 20mL catalyst in the reactor, and the LHSV is 0.5~2h -1 , H 2 o 2 (mg / L):COD(mg / L)=0.4~1.0, react at 40~90℃, and the reaction time is 60~240h.

[0019] The catalytic wet hydrogen peroxide oxidation catalyst described in the present invention can be used to treat coal gasification wastewater, has mild reactio...

Embodiment 1

[0022] ① Prepare 2L of 0.045mol / L cerium nitrate solution;

[0023] ②Under normal temperature and pressure, impregnate 250g of coconut shell charcoal in cerium nitrate solution, and drop 25wt% ammonia solution at a rate of 5mL / min, and stir at 80r / min until the pH of the solution is 8;

[0024] ③The sample was aged at 120°C for 48 hours to prepare a Ce / coconut shell carbon catalyst with a loading capacity of 5%;

[0025] ④Continuous reaction evaluation conditions: initial pH is 3.0, LHSV is 1h -1 , H 2 o 2 (mg / L):COD(mg / L)=0.7, react at 90°C for 120h. The experimental results show that when the prepared Ce / coconut shell carbon catalyst is used to catalyze wet hydrogen peroxide oxidation treatment of refractory coal gasification wastewater at low temperature and normal pressure, the removal rate of COD can reach 62%, and the removal rate of TOC can reach 60%, indicating that The Ce / coconut shell carbon catalyst has good catalytic activity.

Embodiment 2

[0027] ① Prepare 0.6L of 0.090mol / L lanthanum nitrate solution;

[0028] ②Under normal temperature and pressure, impregnate 250g of coal tar activated carbon in lanthanum nitrate solution, and add 25wt% ammonia solution dropwise at a rate of 2mL / min, and stir at 80r / min until the pH of the solution is 9;

[0029] ③ The sample was aged at 90°C for 24 hours to prepare a La / coal tar activated carbon catalyst with a loading of 3%;

[0030] ④Continuous reaction evaluation conditions: initial pH is 5.0, LHSV is 0.5h -1 , H 2 o 2 (mg / L):COD(mg / L)=0.5, react at 80°C for 240h. The experimental results show that when the prepared La / coal tar activated carbon catalyst is used to catalyze wet hydrogen peroxide oxidation treatment of refractory coal gasification wastewater at low temperature and normal pressure, the removal rate of COD can reach 70%, and the removal rate of TOC can reach 65%, indicating that La / coal tar activated carbon catalyst has good catalytic activity.

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Abstract

The invention discloses a modified active carbon catalyst, and preparation and an application thereof, particularly discloses the catalyst for treatment of coal gasification wastewater through a catalytic wet hydrogen peroxide oxidation technology, and the preparation and the application thereof, and belongs to the fields of water treatment technology and environmental functional materials. The coal gasification wastewater is a by-product generated in a coal gasification process, contains a variety of high-concentration pollutants including a large amount of phenols, ammonia, sulfides, cyanides, tar and the like, and has poor biodegradability. Activated carbon as a carrier is loaded with rare earth metals La, Ce, Pr and Nd at low temperature to improve the activity, and the active carbon-based catalyst having larger specific surface area, high activity and high stability is prepared; after the catalyst is used for 240 h in a 80 DEG C atmospheric pressure system, the activity of the catalyst can still basically remain unchanged. Studies on harmless and resourceful treatment and reuse of the coal gasification wastewater are facilitated, and an important scientific and application significance is provided for establishment of corresponding demonstration projects.

Description

technical field [0001] The invention relates to a catalyst with various activated carbons as carriers, doped and modified with rare earth elements and a preparation method thereof, which can be used to catalyze wet hydrogen peroxide oxidation treatment of coal gasification wastewater, and belongs to the field of water treatment technology and environmental functional materials. Background technique [0002] From the perspective of national energy strategy, my country is a country that is "rich in coal, but lacking in oil and gas". As the coal energy and chemical industry has become the focus of the national energy development strategy, there is currently a huge demand for coal gasification technology. A large amount of coal gasification wastewater generated during the process contains high concentrations of pollutants such as phenol, ammonia, sulfide, cyanide and tar. If it is discharged directly without treatment, or if it is discharged with insufficient treatment, it will...

Claims

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Application Information

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IPC IPC(8): B01J23/10C02F1/72
Inventor 孙承林王亚旻卫皇曌刘培娟蒋文天于永辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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