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Phosphoric acid modified cerium oxide catalyst and its preparation method and application

A cerium oxide and catalyst technology, applied in the field of phosphoric acid modified cerium oxide catalyst and its preparation, can solve the problems of poor water resistance and sulfur resistance, low catalytic activity, poisoning and the like of the catalyst

Active Publication Date: 2020-07-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is simple to prepare, low in cost and good in thermal stability, but has low catalytic activity and is prone to low-temperature chlorine poisoning
[0009] Moreover, the existing catalysts for the catalytic oxidation of chlorine-containing volatile organic compounds have poor water resistance and sulfur resistance, and have high requirements for the water content and sulfur content of the flue gas of chlorine-containing volatile organic compounds. The flue gas needs to be dehydrated and desulfurized first

Method used

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  • Phosphoric acid modified cerium oxide catalyst and its preparation method and application
  • Phosphoric acid modified cerium oxide catalyst and its preparation method and application
  • Phosphoric acid modified cerium oxide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Catalyst preparation:

[0045] (1) Mix cerium oxide powder with phosphoric acid (concentration of phosphoric acid solution: 1 mol / L) at a molar ratio of 1:0.05, react at 30° C. for 0.5 h, cool the resulting mixture, let stand, and wash to obtain yellow cerium oxide precipitate.

[0046] (2) Wash the obtained mixture until it is neutral, dry it, and calcinate it at 200° C. for 1 h in an air atmosphere to obtain a catalyst.

[0047] The phosphorus loading of the prepared catalyst was 0.7%.

[0048] Such as figure 1 As shown, the presence of phosphate groups on the surface of ceria was proved by SS NMR characterization. Subsequent in situ infrared characterization as figure 2 As shown, it is also proved that P-O and P=O exist on the surface of cerium oxide after phosphoric acid treatment. After testing and characterization, the main form of phosphoric acid on the surface of the catalyst treated with phosphoric acid is dihydroxy phosphate.

Embodiment 2

[0050] Catalyst preparation:

[0051] (1) Mix cerium oxide powder and phosphoric acid at a molar ratio of 1:0.05, react at 80° C. for 0.5 h, cool the resulting mixture, let stand, and wash to obtain yellow cerium oxide precipitate.

[0052] (2) Wash the obtained mixture until it is neutral, dry it, and calcinate it at 200° C. for 1 h in an air atmosphere to obtain a catalyst.

[0053] The phosphorus loading of the prepared catalyst was 0.4%.

Embodiment 3

[0055] Catalyst preparation:

[0056] (1) Mix cerium oxide powder and phosphoric acid at a molar ratio of 1:0.05, react at 30° C. for 0.5 h, cool the resulting mixture, let stand, and wash to obtain yellow cerium oxide precipitate.

[0057] (2) Wash the obtained mixture until it is neutral, dry it, and calcinate it at 300° C. for 2 hours in an air atmosphere to obtain a catalyst.

[0058] The phosphorus loading of the prepared catalyst was 0.7%.

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Abstract

The invention relates to the technical field of air pollution control, and discloses a phosphoric acid-modified cerium oxide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) soaking cerium oxide in a phosphoric acid solution, then filtering out the cerium oxide and washing until neutral, and drying; (2) drying the dried cerium oxide at 100-400° C. Calcined for 1-4 hours to obtain a phosphoric acid-modified cerium oxide catalyst. The catalyst prepared by the preparation method of the present invention can be used for the catalytic oxidation degradation of chlorine-containing volatile organic compounds. It is not easy to produce toxic by-products when removing sexual organic matter, and there is no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a phosphoric acid-modified cerium oxide catalyst and a preparation method and application thereof. Background technique [0002] Chlorine-containing volatile organic compounds are a kind of organic compounds, such as chlorobenzene, dichlorobenzene, trichlorethylene, etc., which are commonly used reagents in industrial production processes, and are discharged into the environment in the form of waste water or waste gas. Most chlorine-containing volatile organic compounds are environmentally persistent and highly toxic, and can exist for a long time in the atmosphere or water environment, and accumulate in organisms through the food chain, causing "carcinogenic, teratogenic, and mutagenic" effects. Chlorine-containing organic compounds are generally toxic. The U.S. Environmental Protection Agency screened out 65 types of compounds and 129 priority control "blacklists"...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18B01D53/86B01D53/70
CPCB01D53/8662B01D2257/2064B01J27/1804
Inventor 吴忠标翁小乐戴晓霞刘越王海强
Owner ZHEJIANG UNIV
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