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A low-vanadium catalyst for denitrification, mercury removal, and dioxin removal, and its preparation method and application

A technology for removing dioxins and catalysts, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of human and environmental pollution, high catalyst cost, high toxicity, etc., and achieve low cost , low toxicity, excellent removal performance

Active Publication Date: 2020-12-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the actual use of this technology. One is that the cost of the catalyst is higher; the other is that the active component V 2 o 5 The precursors of these compounds are generally very toxic and easily pollute the human body and the environment

Method used

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  • A low-vanadium catalyst for denitrification, mercury removal, and dioxin removal, and its preparation method and application
  • A low-vanadium catalyst for denitrification, mercury removal, and dioxin removal, and its preparation method and application
  • A low-vanadium catalyst for denitrification, mercury removal, and dioxin removal, and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a method for preparing a low-vanadium catalyst for denitrification, mercury removal, and dioxin removal. The preparation method includes the following steps:

[0039] (1) Dissolve oxalic acid in water, heat to 60°C, dissolve cerium nitrate in oxalic acid solution, add TiO 2 Carrier, stirred at 60°C for 4h, dried at 110°C, and calcined at 500°C for 4h to obtain CeO 2 / TiO 2 carrier;

[0040] (2) Dissolve oxalic acid in water, heat to 60°C, dissolve ammonium metatungstate in oxalic acid solution, add CeO 2 / TiO 2 Carrier, stirred at 60°C for 4h, dried at 110°C, and calcined at 500°C for 4h to obtain WO 3 -CeO 2 / TiO 2 carrier;

[0041] (3) Dissolve oxalic acid in water, heat to 60°C, dissolve ammonium metavanadate in oxalic acid solution, add WO 3 -CeO 2 / TiO 2 The carrier was stirred at 60°C for 4 hours, dried at 110°C, and calcined at 500°C for 4 hours to obtain the catalyst.

[0042] V in the prepared catalyst 2 o 5 The percentage ...

Embodiment 2

[0044] This embodiment provides a method for preparing a low-vanadium catalyst for denitrification, mercury removal, and dioxin removal. The preparation method includes the following steps:

[0045] (1) Dissolve oxalic acid in water, heat to 50°C, dissolve cerium nitrate in oxalic acid solution, add TiO 2 Carrier, stirred at 50°C for 5h, dried at 100°C, and calcined at 400°C for 5h to obtain CeO 2 / TiO 2 carrier;

[0046] (2) Dissolve oxalic acid in water, heat to 50°C, dissolve ammonium metatungstate in oxalic acid solution, add CeO 2 / TiO 2 Carrier, stirred at 50°C for 5h, dried at 100°C, and calcined at 400°C for 5h to obtain WO 3 -CeO 2 / TiO 2 carrier;

[0047] (3) Dissolve oxalic acid in water, heat to 50°C, dissolve ammonium metavanadate in oxalic acid solution, add WO 3 -CeO 2 / TiO 2 The carrier was stirred at 50°C for 5 hours, dried at 100°C, and calcined at 400°C for 5 hours to obtain the catalyst.

[0048] V in the prepared catalyst 2 o 5 The percentage ...

Embodiment 3

[0050] This embodiment provides a method for preparing a low-vanadium catalyst for denitrification, mercury removal, and dioxin removal. The preparation method includes the following steps:

[0051] (1) Dissolve oxalic acid in water, heat to 70°C, dissolve cerium nitrate in oxalic acid solution, add TiO 2 Carrier, stirred at 70°C for 3h, dried at 120°C, and calcined at 600°C for 3h to obtain CeO 2 / TiO 2 carrier;

[0052] (2) Dissolve oxalic acid in water, heat to 70°C, dissolve ammonium metatungstate in oxalic acid solution, add CeO 2 / TiO 2 Carrier, stirred at 70°C for 3h, dried at 120°C, and calcined at 600°C for 3h to obtain WO 3 -CeO 2 / TiO 2 carrier;

[0053] (3) Dissolve oxalic acid in water, heat to 70°C, dissolve ammonium metavanadate in oxalic acid solution, add WO 3 -CeO 2 / TiO 2 The carrier was stirred at 70°C for 3 hours, dried at 120°C, and calcined at 600°C for 3 hours to obtain the catalyst.

[0054] V in the prepared catalyst 2 o 5 The percentage ...

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Abstract

The invention provides a low-vanadium catalyst for denitration, demercuration and dioxin removal, and a preparation method and application thereof. The catalyst is prepared by using TiO2 as a carrier,V2O5 as a main active component and WO3 and CeO2 as secondary active components exerting a synergistic effect and adopting a step-by-step impregnation method. The method is characterized in that theuse amount of high-toxicity vanadium is reduced, and the toxic effect of subsequent pollutants is remarkably reduced. During flue gas treatment with the catalyst, the removal rate of NOx is as high as95%, the removal rate of mercury is as high as 90%, and the removal rate of dioxin is as high as 95%. The low-vanadium catalyst is applicable to treatment of waste gas discharged by industries such as steel plants and waste incineration plants.

Description

technical field [0001] The invention belongs to the fields of environmental materials, environmental catalysis and environmental technology, and relates to a catalyst, in particular to a low-vanadium denitrification, mercury removal and dioxin removal catalyst and its preparation method and application. Background technique [0002] During the steel sintering process, the exhaust gas contains a large amount of particulate matter, SO 2 , NO x , Hg, dioxin and other pollutants. With the implementation of ultra-low emissions, dust removal and desulfurization can be upgraded using existing control facilities, while NO x The coordinated control of multi-pollutants such as , Hg, and dioxin will become the focus of future research. [0003] SCR denitrification technology refers to the use of NH 3 or urea as reducing agent to reduce NO x reduced to N 2 , the most widely used in industry is V 2 o 5 -WO 3 / TiO 2 Catalyst, not only for NO x The removal efficiency is high, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J37/08B01D53/86B01D53/56B01D53/64B01D53/70
CPCB01D53/8628B01D53/8662B01D53/8665B01D2257/206B01D2257/40B01D2257/602B01D2258/0283B01J23/002B01J23/30B01J37/082B01J2523/00B01J2523/3712B01J2523/47B01J2523/55B01J2523/69
Inventor 朱廷钰刘霄龙秦玉刘法高赵紫薇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI