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Cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using metal organic framework as template and preparation method thereof

A metal-organic framework, composite oxide technology, applied in catalyst activation/preparation, combustion method, physical/chemical process catalyst, etc., can solve the problems of long reaction time, large energy consumption, complex process, etc., and achieve good catalytic performance, The effect of improved catalytic ability and broad application prospects

Inactive Publication Date: 2018-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its widely used preparation methods such as hydrothermal method, citric acid complex combustion method and sol-gel method have disadvantages such as uneven compounding, complex process, large energy consumption, long reaction time, low yield and poor reproducibility. CN101623639 and patent CN104944458A

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  • Cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using metal organic framework as template and preparation method thereof
  • Cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using metal organic framework as template and preparation method thereof
  • Cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using metal organic framework as template and preparation method thereof

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preparation example Construction

[0040] In the specific embodiment of the present invention, the cerium-based metal-organic framework material used is Ce-BTC (molecular formula is Ce(1,3,5-BTC)(H 2 O) 6 ); The preparation method of Ce-BTC comprises the following steps:

[0041] Take a cerium-based salt and an organic ligand (mesitylene), and configure a metal-organic framework compound Ce(1, 3, 5-BTC)(H2 O) 6 Precursor mixed liquid, let stand, wash with solvent after centrifugation, dry after filtering, grind, obtain powdery sample Ce(1,3,5-BTC)(H 2 O) 6 .

[0042] In a specific embodiment, for the decomposition temperature range of the cerium-based metal-organic framework material Ce-BTC is between 300°C and 500°C, the calcination temperature is selected to be between 300°C and 500°C, the calcination time is 6 hours, and the calcination rate is 2°C / min .

Embodiment 1

[0044] MnOx-CeO 2 The preparation of composite catalyst, concrete steps are as follows:

[0045] (1) Weigh 4.34 g Ce(NO 3 ) 3 •6H 2 O was dissolved in 50 mL of deionized water, 2.10 g of mesitylene was dissolved in a mixture of 150 mL of deionized water and 200 mL of ethanol, and the above two solutions were mixed to obtain a precursor solution. Washed three times with deionized water, filtered and dried to obtain Ce(1, 3, 5-BTC)(H 2 O) 6 , was determined to be Ce(1, 3, 5-BTC)(H 2 O) 6 ;

[0046] The obtained Ce(1, 3, 5-BTC)(H 2 O) 6 The specific surface area is 715 m 2 / g;

[0047] (2) Weigh 0.8 g Ce(1, 3, 5-BTC)(H 2 O) 6 and 182μL 50wt% Mn(NO 3 ) 2 The solution was dispersed in a mixed solution of 20 mL of ethanol and water (ethanol: water = 1:1, v / v), allowed to stand at room temperature for 24 h, dried at 60°C, and powdered after grinding, then dried at 300°C Calcined at 2°C / min for 6 h to obtain MnOx-CeO 2 composite catalyst material.

[0048] The prepar...

Embodiment 2

[0051] MnOx-CeO 2 The preparation of composite catalyst, concrete steps are as follows:

[0052] (1) Weigh 4.34 g Ce(NO 3 ) 3 •6H 2 O was dissolved in 50 mL of deionized water, and 2.10 g of mesitylene was dissolved in a mixture of 150 mL of deionized water and 200 mL of ethanol, and the above two solutions were mixed to obtain a mixed solution of precursor, which was left to stand for 24 h, and then used after centrifugation. Washed 3 times with deionized water, filtered and dried to obtain Ce(1, 3, 5-BTC)(H 2 O) 6 , was determined to be Ce(1, 3, 5-BTC)(H 2 O) 6 ;

[0053] The obtained Ce(1, 3, 5-BTC)(H 2 O) 6 The specific surface area is 715 m 2 / g;

[0054] (2) Weigh 0.8 g Ce(1, 3, 5-BTC)(H 2 O) 6 and 182μL 50wt% Mn(NO 3 ) 2 The solution was dispersed in a mixed solution of 20 mL of ethanol and water (ethanol: water = 1:1, v / v), and after standing at room temperature for 24 h, it was dried and ground at 60°C to obtain a powder, and then dried at 400°C to Cal...

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Abstract

The invention discloses a cerium-based composite oxide VOCs (volatile organic compounds) combustion catalyst using a metal organic framework as a template and a preparation method thereof. The preparation method comprises the following steps of soaking and mixing cerium-based metal organic framework material and transition metal salt in a solvent; taking out the materials; drying the materials; grinding the materials into powder; roasting the materials in the air to obtain the cerium-based composite oxide VOCs combustion catalyst using the metal organic framework as the template. The metal organic framework is used for introducing into transition metal. Compared with cerium-based composite oxide prepared by a conventional method, the material has the advantages that the dispersion degree of the transition metal is greatly improved; the catalytic capability of the prepared cerium-based composite oxide on the organic waste gas is obviously improved; the higher catalytic activity is realized; after the cyclic multi-time catalysis reaction, good catalytic performance can still be maintained; the wide application prospects are realized in the organic waste gas catalytic oxidization field. Meanwhile, the preparation process of the method is simple and convenient; the implementation is easy; the preparation conditions are mild; the energy consumption is low; the industrial large-scaleproduction is facilitated.

Description

technical field [0001] The invention relates to the technical field of organic waste gas (VOCs) catalytic combustion (oxidation), in particular to a cerium-based composite oxide VOCs combustion catalyst using a metal-organic framework as a template and a preparation method thereof. Background technique [0002] Organic waste gas (VOCs) has become one of the main air pollutants in my country in recent years, which has a significant impact on the atmospheric environment and human health. Therefore, the purification and treatment technology of VOCs has become a research hotspot in the field of environmental catalysis. [0003] Catalytic combustion is one of the most effective technologies for VOCs treatment, and catalysts are the key to this technology. The catalyst should not only be cheap and easy to obtain, but also have high catalytic activity. Among the currently commonly used transition metal catalysts, cerium-based composite catalysts have been widely used in environmen...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/34B01J35/10B01J37/02B01J37/08F23G7/07
CPCF23G7/07B01J23/10B01J23/34B01J37/0201B01J37/086B01J35/61
Inventor 付名利林雪婷叶代启吴军良贺辉胡芸
Owner SOUTH CHINA UNIV OF TECH
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