Method for preparing hydrophobic Cr-Ce-based catalyst through ultrasound-hydrogen reduction

A hydrophobicity and catalyst technology, applied in the field of catalytic chemistry, can solve the problems of increasing operating costs, decreasing the activity of catalysts for catalytic oxidation of CVOCs, and reducing the content of surface active species, achieving high catalytic activity, good practical application prospects, and strong hydrophobicity. Effect

Active Publication Date: 2012-02-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that supported Cr-based catalysts have the highest catalytic combustion activity for CVOCs, but the complete combustion temperature of most of the transition metal catalysts for several common CVOCs such as p-chlorobenzene, dichloroethane, and trichloroethylene is above 350 °C. Activity still needs to be improved
[0004] In addition, when the relative humidity of the external environment is high, a large number of water molecules form competitive adsorption on the surface of the catalyst to occupy the active sites, resulting in a sharp decline in the activity of the catalyst for catalytic oxidation of CVOCs.
The addition of water vapor causes chlorobenzene and water molecules to compete for adsorption on the surface of the catalyst, reducing the effective active sites on the surface of the catalyst and reducing the content of surface active species, thereby reducing the activity of the catalyst, resulting in a reduction in the efficiency of catalytic combustion to control CVOCs pollution. cost increase

Method used

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  • Method for preparing hydrophobic Cr-Ce-based catalyst through ultrasound-hydrogen reduction
  • Method for preparing hydrophobic Cr-Ce-based catalyst through ultrasound-hydrogen reduction
  • Method for preparing hydrophobic Cr-Ce-based catalyst through ultrasound-hydrogen reduction

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Experimental program
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Effect test

Embodiment 1

[0028] 1.9207g Cr(NO 3 ) 3 ·9H 2 O and 0.5211g Ce(NO 3 ) 3 ·6H 2 O was dissolved together in 10mL deionized water to prepare Cr(NO 3 ) 3 And Ce(NO 3 ) 3 Mixed solution; add 0.05g 60 mesh Al to the mixed solution 2 O 3 The particles were oscillated at a constant temperature of 50°C and immersed in 300W ultrasonic for 5 minutes, dried at 120°C for 12 hours, and calcined at 550°C for 5 hours to obtain solid particles. min's H 2 Purge for 60 minutes. The solid particles after the reduction treatment were then placed in the air and calcined at 350°C for 60 minutes to prepare a hydrophobic Cr-Ce-based catalyst.

Embodiment 2

[0030] 2.881g Cr(NO 3 ) 3 ·9H 2 O and 0.7816g Ce(NO 3 ) 3 ·6H 2 O was dissolved together in 10mL deionized water to prepare Cr(NO 3 ) 3 And Ce(NO 3 ) 3 Mixed solution; add 0.05g 80 mesh Al to the mixed solution 2 O 3 The particles were oscillated at a constant temperature of 30°C and immersed in 250W ultrasonic for 20 minutes, dried at 120°C for 12 hours, and calcined at 550°C for 5 hours to obtain solid particles; the solid particles were placed in a fixed bed, the bed was heated to 350°C, and the volume flow rate was 30mL / min's H 2 Purge for 50 min. The solid particles after the reduction treatment were then placed in the air and calcined at 350°C for 60 minutes to prepare a hydrophobic Cr-Ce-based catalyst.

Embodiment 3

[0032] 3.841g Cr(NO 3 ) 3 ·9H 2 O and 1.0422g Ce(NO 3 ) 3 ·6H 2 O was dissolved together in 10mL deionized water to prepare Cr(NO 3 ) 3 And Ce(NO 3 ) 3 Mixed solution; add 0.05g 80 mesh Al to the mixed solution 2 O 3 The particles were oscillated at a constant temperature of 40°C and immersed in 150W ultrasonic for 40 minutes, dried at 120°C for 12 hours, and calcined at 550°C for 5 hours to obtain solid particles; the solid particles were placed in a fixed bed, the bed was heated to 350°C, and the volume flow rate was 40mL / min's H 2 Purge for 30 minutes. The solid particles after the reduction treatment were then placed in the air and calcined at 350°C for 60 minutes to prepare a hydrophobic Cr-Ce-based catalyst.

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Abstract

The invention discloses a method for preparing a hydrophobic Cr-Ce-based catalyst through ultrasound-hydrogen reduction. The method comprises the following steps: 1, codissolving chromium nitrate and cerium nitrate in deionized water to prepare a mixed solution of chromium nitrate and cerium nitrate; 2, adding Al2O3 particles to the mixed solution, oscillating and carrying out ultrasonic dipping at a constant temperature, drying, and calcinating to obtain solid particles; and 3, carrying out reduction processing on the solid particles in hydrogen, and calcinating the solid particles in air toprepare the hydrophobic Cr-Ce-based catalyst. The catalyst prepared through the method of the invention is mainly used for catalyzing the combustion of volatile organic compounds containing chlorine,the method which allows noble metals to be replaced with transition metals allows the cost to be reduced and the high activity of the catalyst to be simultaneously maintained, and the catalyst can catalyze the combustion of the volatile organic compounds containing chlorine at a low temperature; and the catalyst which still has a high activity at a high extraneous humidity has a good practical application prospect.

Description

technical field [0001] The invention belongs to the field of catalytic chemistry and relates to a preparation method of a catalyst, in particular to a method for preparing a hydrophobic Cr-Ce-based catalyst by ultrasonic-hydrogen reduction. Background technique [0002] Volatile organic compounds (abbreviation: VOCs) are a class of highly toxic and polluting chemical substances. Chlorine-containing volatile organic compounds (abbreviation: CVOCs) belong to one of them. They are extremely volatile and stable in the atmosphere for a long time. If it does not degrade, it will cause great harm to human health and the ecological environment. Among the CVOCs removal technologies, the catalytic combustion method is considered to be a more economical and feasible method to deal with CVOCs pollution because it can carry out catalytic oxidation reaction at a lower temperature, has lower energy consumption, high removal efficiency, and wide application range. However, at present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01D53/70B01D53/86
Inventor 李忠王玉锐夏启斌刘治猛
Owner SOUTH CHINA UNIV OF TECH
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