Honeycomb type arsenic poisoning-resistant SCR denitration catalyst and preparation method thereof

A denitration catalyst, arsenic poisoning technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as poor mechanical properties, prone to alkali metal poisoning, etc., to improve adhesion , The effect of improving catalyst strength and enhancing wear strength

Pending Publication Date: 2021-10-22
北京华电光大环境股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a cellular anti-arsenic poisoning SCR denitrification catalyst and its preparation method, to solve the technical problems of poor mechanical properties and prone to alkali metal poisoning in existing commercial cellular SCR denitrification catalysts, and to provide a A preparation method of a high-strength honeycomb anti-alkali metal SCR denitration catalyst, which can significantly improve the mechanical properties and anti-alkali metal poisoning performance of the catalyst

Method used

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  • Honeycomb type arsenic poisoning-resistant SCR denitration catalyst and preparation method thereof

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Embodiment 1

[0029] Embodiment 1: A preparation method of a cellular anti-arsenic poisoning SCR denitrification catalyst, comprising the following steps:

[0030] (1) Dry mix 700g of titanium dioxide, 50g of silicon micropowder, 100g of fumed silica and 20g of glass fiber filaments (60mm in length, 2μm in diameter) in a powerful mixer, and evenly disperse the glass fiber filaments into the powder, Mixing time 1h;

[0031] (2) 38.6g ammonium metavanadate is dissolved in 90ml water, 122.5g ammonium heptamolybdate is dissolved in 240ml water, 52.8g praseodymium nitrate is dissolved in 130ml water, and above-mentioned solution is joined in the mixed material of step (1), Then stir evenly, stirring time 2h;

[0032] (3) Add 18g pseudo-boehmite, 12g bentonite, 10g hydroxyethyl cellulose, 2g polyacrylamide, 3g polyethylene oxide and 6g squash powder successively in the mixed material of step (2), mixing temperature 60 ℃, mixing time 1h;

[0033] (4) 20ml of 1mol / L nitric acid solution is added...

Embodiment 2

[0038] Embodiment 2: A preparation method of a cellular anti-arsenic poisoning SCR denitrification catalyst, comprising the following steps:

[0039] (1) Dry mix 600g of titanium dioxide, 70g of silica powder, 130g of fumed silica and 25g of glass fiber filaments (70mm in length, 3μm in diameter) in a powerful mixer, and evenly disperse the glass fiber filaments into the powder, Mixing time 1h;

[0040] (2) 64.3g ammonium metavanadate is dissolved in 115ml water, 147.1g ammonium heptamolybdate is dissolved in 220ml water, 79.2g praseodymium nitrate is dissolved in 135ml water, and above-mentioned solution is joined in the mixed material of step (1), Then stir evenly, stirring time 3h;

[0041] (3) Add 16g pseudo-boehmite, 15g bentonite, 9g hydroxyethyl cellulose, 3g polyacrylamide, 3.5g polyethylene oxide and 8g squash powder successively in the mixed material of step (2), mixing temperature 55°C, mixing time 2h;

[0042] (4) Add the nitric acid solution of 10ml 2mol / L to t...

Embodiment 3

[0047] Embodiment 3: A preparation method of a cellular anti-arsenic poisoning SCR denitrification catalyst, comprising the following steps:

[0048] (1) Dry-mix 640g of titanium dioxide, 60g of silica powder, 120g of fumed silica and 18g of glass fiber filaments (length 65mm, diameter 2.5μm) in a strong mixer, and evenly disperse the glass fiber filaments into the powder , mixing time 2h;

[0049] (2) 51.4g ammonium metavanadate is dissolved in 130ml water, 122.5g ammonium heptamolybdate is dissolved in 350ml water, 105.5g praseodymium nitrate is dissolved in 240ml water, and above-mentioned solution is added in the mixed material of step 1.1, then stir Evenly, stirring time 2h;

[0050] (3) Add 20g pseudo-boehmite, 12g bentonite, 6g hydroxyethyl cellulose, 2g polyacrylamide, 2g polyethylene oxide and 12g squash powder successively in the mixed material of step (2), mixing temperature 50 ℃, mixing time 1.5h;

[0051] (4) Add the nitric acid solution of 10ml 3mol / L to the m...

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Abstract

The invention relates to a honeycomb type arsenic poisoning-resistant SCR denitration catalyst and a preparation method thereof, and belongs to the technical field of environment protection and denitration catalysts. The preparation method comprises the following steps: mixing silica powder, a mixed carrier of fumed silica and titanium dioxide, an active component solution, an auxiliary agent solution, glass fiber filaments, pseudo-boehmite, bentonite, hydroxyethyl cellulose, polyacrylamide, polyoxyethylene and sesbania powder, adding a nitric acid solution, aging, and molding by a vertical hydraulic extruder; and finally, drying and roasting to obtain the high-strength honeycomb type arsenic poisoning-resistant SCR denitration catalyst. The obtained honeycomb type arsenic poisoning resisting catalyst has remarkable mechanical performance, denitration activity and arsenic poisoning resisting performance, and the denitration efficiency in high-arsenic flue gas can be stabilized to be 94% or above.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and denitrification catalysis, and in particular relates to a honeycomb anti-arsenic poisoning SCR denitrification catalyst and a preparation method thereof. Background technique [0002] At present, the widely used denitration catalyst is honeycomb commercial V 2 o 5 -WO 3 / TiO 2 base catalyst or V 2 o 5 -MoO 3 / TiO 2 base catalyst. When the denitrification catalyst is in use, the temperature environment is 300-420 ° C, most of the layout is high in dust, and the catalyst is in a long-term environment containing fly ash, SO x , alkali metals (K, Na, etc.) and Hg, As and other flue gases can easily cause catalyst poisoning and deactivation. Among them, arsenic poisoning is one of the common causes of catalyst deactivation, and the content of arsenic in coal varies greatly, with the content ranging from 0.5 to 80 μg / g. If the mass fraction of arsenic in coal exceeds 3×10 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J35/04B01J35/06B01J35/10B01J35/02B01D53/86B01D53/56
CPCB01J35/04B01J23/28B01J23/002B01J35/1014B01J35/1019B01J35/023B01J35/06B01D53/8628B01J2523/00B01J2523/3718B01J2523/41B01J2523/47B01J2523/55B01J2523/68
Inventor 曲艳超陈晨刘丁嘉
Owner 北京华电光大环境股份有限公司
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