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Two-stage catalyst for catalytic degradation of chlorine-containing volatile organic chemicals (VOCs) as well as preparation method and application of two-stage catalyst

A catalytic degradation and catalyst technology, applied in the field of catalysis, can solve the problems of increasing process complexity, application limitation, incomplete catalytic oxidation, etc., and achieves the solution of deep oxidation and catalyst chlorine poisoning, good anti-chlorine poisoning performance, and excellent catalytic performance. Effect

Inactive Publication Date: 2018-06-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of noble metal catalysts is high, it is easy to generate oxychlorine compound poisoning during the reaction, and it is easy to be lost at high temperature, these problems have limited its application; the activity of transition metal oxide catalysts is lower than that of noble metal catalysts, and it is prone to chlorine poisoning
[0006] The existing catalysts are all one-stage catalysts, which simultaneously undertake the functions of dechlorination and oxidation. In the application, problems such as incomplete catalytic oxidation, formation of more toxic by-products, and catalyst poisoning generally exist. After the process of VOCs, a deep oxidation process needs to be added, which increases the complexity of the process

Method used

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  • Two-stage catalyst for catalytic degradation of chlorine-containing volatile organic chemicals (VOCs) as well as preparation method and application of two-stage catalyst
  • Two-stage catalyst for catalytic degradation of chlorine-containing volatile organic chemicals (VOCs) as well as preparation method and application of two-stage catalyst
  • Two-stage catalyst for catalytic degradation of chlorine-containing volatile organic chemicals (VOCs) as well as preparation method and application of two-stage catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Cr / TiO 2 -Cu / CeO 2

[0039] Preparation of Catalyst A: Pipette a certain amount of chromium nitrate solution into P25 (commercially available titanium dioxide) (the mass ratio of chromium and titanium is 1:18), stir vigorously for 3 hours, then put it in an oven and dry it at 80°C for 12 hours, and then transfer it to the Calcined at 450°C for 3h in a Furnace.

[0040] Preparation of catalyst B: Calcining cerium nitrate in a muffle furnace at 450°C for 3h to obtain pure CeO 2 . Dissolve the copper nitrate solution in deionized water, add cerium oxide (the mass ratio of copper to cerium is 1:7), stir for 3 hours, then put it in an oven for 12 hours at 80°C, and then transfer it to a muffle furnace for 3 hours at 450°C. .

[0041]Catalytic combustion performance test of the catalyst: Sieve the finished catalysts A and B prepared above to 40-60 mesh, take 0.6ml each, mix them with equal volume of quartz sand, put them into a quartz reaction tube, and use 0....

Embodiment 2

[0042] Example 2: CeO 2 / TiO 2 -CuCl 2 / CeO 2

[0043] Preparation of catalyst A: preparation of granular TiO by hydrothermal method 2 , cerium nitrate was calcined in a muffle furnace at 450°C for 3h to obtain pure CeO 2 . CeO 2 and TiO 2 Mix according to a certain ratio (mass ratio of cerium and titanium is 3:1), ball mill for 2 hours, transfer to a muffle furnace and bake at 450°C for 3 hours, and finally press into tablets and sieve.

[0044] Preparation of catalyst B: Calcining cerium nitrate in a muffle furnace at 450°C for 3h to obtain pure CeO 2 . CuCl 2 and CeO 2 Mix according to a certain ratio (mass ratio of copper to cerium is 1:2), ball mill for 2 hours, put in a muffle furnace for 3 hours at 400°C, and finally press into tablets and sieve.

[0045] Catalytic combustion performance test of the catalyst: Sieve the finished catalysts A and B prepared above to 40-60 mesh, take 0.6ml each, mix them with equal volume of quartz sand, put them into a quartz r...

Embodiment 3

[0046] Example 3: Ce / TiO 2 -Cu / CeO 2

[0047] Preparation of Catalyst A: Pipette a certain amount of cerium nitrate solution into titanium dioxide prepared by hydrothermal method (mass ratio of cerium to titanium: 1:6), stir vigorously for 3 hours, then put it in an oven for 12 hours at 80°C, and then transfer it into the muffle Baking in the furnace at 450°C for 3h.

[0048] Preparation of catalyst B: Calcining cerium nitrate in a muffle furnace at 450°C for 3h to obtain pure CeO 2 . Dissolve the copper chloride solution in deionized water, add cerium oxide (the mass ratio of copper to cerium is 1:7), stir for 3 hours, then put it in an oven for 12 hours at 80°C, and then transfer it to a muffle furnace for roasting at 400°C 3h.

[0049] Catalytic combustion performance test of the catalyst: Sieve the finished catalysts A and B prepared above to 40-60 mesh, take 0.6ml each, mix them with equal volume of quartz sand, put them into a quartz reaction tube, and use 0.5ml in ...

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Abstract

The invention discloses a two-stage catalyst for catalytic degradation of chlorine-containing volatile organic chemicals (VOCs) as well as a preparation method and application of the two-stage catalyst. The two-stage catalyst is prepared from a catalyst A, a catalyst B and a barrier medium, wherein the catalyst A and the catalyst B are set in two stages, and the two stages of catalysts are isolated from each other by means of the barrier medium; the active components of the catalyst A are at least one of compounds of Ce, Cr, V, Fe and Ni, and a carrier of the catalyst A is an acidic oxide; theactive components of the catalyst B are least one of compounds of Cu, and a carrier of the catalyst B is CeO2; the barrier medium is at least one of SiO2, Al2O3, quartz sand, quartz wool and glass fibers. The two-stage catalyst can well solve the problems of deep oxidation and catalyst chlorine poisoning.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a two-stage catalyst for catalytically degrading chlorine-containing VOCs (volatile organic compounds), a preparation method and application thereof. Background technique [0002] Sulfur dioxide, nitrogen oxides, VOCs (volatile organic compounds) and inhalable particulate matter are the main components of smog. Among them, sulfur dioxide and nitrogen oxides have gradually improved after years of vigorous regulation, while the emissions of volatile organic compounds are huge, involving a wide range of areas, and the control is more difficult and complicated than sulfur dioxide and nitrogen oxides. The current control efforts have little effect. Volatile organic compound emission reduction work has entered the "critical period and deep water area". [0003] National policies and regulations also play an important guiding role in volatile organic compound pollution control. In 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/22B01J23/26B01J23/745B01J23/755B01J23/83B01J27/122B01J33/00B01D53/86B01D53/44
CPCB01D53/8687B01J23/10B01J23/22B01J23/26B01J23/745B01J23/755B01J23/83B01J27/122B01J33/00B01D2257/708B01J35/19
Inventor 曹爽吴忠标王海强文叶轩费晓琦
Owner ZHEJIANG UNIV
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