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Composite catalyst for removing NOx and smoke dust as well as preparation method and application of composite catalyst

A composite catalyst, SCR catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. problems, to achieve the effect of improving stability, preventing fouling and clogging, and reducing the frequency of purging

Inactive Publication Date: 2021-01-26
SHANDONG GUOSHUN CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can reduce the fouling problem of the catalyst to a certain extent, but when the sulfur content in the flue gas is high, SO 2 , O 2 and NH 3 Easy to produce sulfate ((NH 4 ) 2 SO 4 , (NH 4 ) HSO 4 )), the generation of ammonium sulfate will intensify the adhesion of soot on the surface of the catalyst and block the catalyst channel
At the same time, due to the porous characteristics of the honeycomb catalyst itself, the flue gas flowing through the catalyst body will also cause a backlog of dust due to mechanical blocking.

Method used

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  • Composite catalyst for removing NOx and smoke dust as well as preparation method and application of composite catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, a composite catalyst and preparation method for removing NOx and soot are provided, and the preparation method includes the following steps:

[0045] (1) Preparation of perovskite-type PM catalyst: Weigh the nitrate (Co( NO 3 ) 2 : Pd(NO 3 ) 2 : SrNO 3 : La(NO 3 ) 3 =0.9:0.1:0.2:0.8; dissolve in deionized water and stir evenly, then add citric acid (C 6 h 8 o 7 ), temperature controlled (80°C) and stirred for 12h until the solution was evaporated to dryness and turned into a translucent gel, and the above wet gel was dried at 120°C to obtain dry La0.8Sr0.2Co0.9Pd0.1O 3 precursor.

[0046] (2) Dissolve the above precursor in deionized water, stir under temperature control, and make honeycomb V 2 o 5 / WO 3 / TiO 2 The catalyst carrier is immersed in the solution for several hours, and then dried and calcined in a muffle furnace. The calcining process is carried out in two stages. After calcining at a medium temperature for several hours, i...

Embodiment 2

[0049] In this embodiment, a composite catalyst and preparation method for removing NOx and soot are provided, and the preparation method includes the following steps:

[0050] (1) Preparation of perovskite-type PM catalyst: Weigh the nitrate (Co( NO 3 ) 2 : Pd(NO 3 ) 2 : SrNO 3 : La(NO 3 ) 3 =0.8:0.2:0.15:0.85; dissolve in deionized water and stir evenly, then add citric acid (C 6 h 8 o 7 ), stirred at a controlled temperature (75°C) for 10 hours until the solution was evaporated to dryness and turned into a translucent gel, and dried at 110°C to obtain dry La0.85Sr0.15Co0.8Pd0.2O 3 precursor.

[0051] (2) Dissolve the above precursor in deionized water, stir under temperature control, and make honeycomb V 2 o 5 / WO 3 / TiO 2 The catalyst carrier is immersed in the solution for several hours, and then dried and calcined in a muffle furnace. The calcining process is carried out in two stages. After calcining at a medium temperature for several hours, it is calcine...

Embodiment 3

[0053] In this embodiment, a composite catalyst and preparation method for removing NOx and soot are provided, and the preparation method includes the following steps:

[0054] (1) Preparation of perovskite-type PM catalyst: Weigh the nitrate (Co( NOx) 2 : Pd(NOx) 2 : SrNOx: La(NOx) 3 =0.9:0.1:0.1:0.9; dissolve in deionized water and stir evenly, then add citric acid (C 6 h 8 o 7 ), stirred at temperature (85°C) for 14h until the solution evaporated to dryness and turned into a translucent gel, and dried the above wet gel at 130°C to obtain dry La0.9Sr0.1Co0.9Pd0.1O 3 precursor.

[0055] (2) Dissolve the above precursor in deionized water, stir under temperature control, and make honeycomb V 2 o 5 / WO 3 / TiO 2 The catalyst carrier is immersed in the solution for several hours, and then dried and calcined in a muffle furnace. The calcining process is carried out in two stages. After calcining at a medium temperature for several hours, it is calcined at a high temperat...

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Abstract

The invention particularly relates to a composite catalyst for removing NOx and smoke dust as well as a preparation method and application of the composite catalyst. A honeycomb type NH3-SCR catalystis a denitration catalyst which is widely used at present, and due to the problems that the efficiency of a single catalyst is low, ammonium sulfate salt is deposited, the catalyst is not resistant tohigh temperature, the catalytic efficiency is reduced and the like, smoke dust accumulation on the surface of a grid catalyst can be aggravated. Aiming at the current situation, the invention provides the composite catalyst capable of adapting to the medium-high temperature flue gas environment. The composite catalyst has two effects of denitration and dust removal, the denitration and dust removal efficiency at 300 DEG C can still reach 95% or above, dust accumulation on the surface of the grid catalyst can be effectively reduced, and the composite catalyst has a good prospect when applied to industrial flue gas treatment.

Description

technical field [0001] The invention belongs to the technical field of smoke and dust removal catalysts, and in particular relates to a multifunctional composite catalyst for simultaneously removing NOx and smoke dust, a preparation method of the composite catalyst and an application in industrial smoke removal. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid development of industry, my country's economic strength has been increasing day by day in recent years, and the ensuing environmental problems also need to be solved urgently. Use NH 3 (NH 3 -SCR) for selective catalytic reduction is currently widely used in industrial environments (such as coal-fire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/04B01J37/03B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01J23/8993B01J23/002B01J37/036B01J37/0201B01J37/082B01D53/8628B01D2258/0283B01D2257/40B01J2523/00B01J35/56B01J2523/24B01J2523/3706B01J2523/47B01J2523/55B01J2523/69B01J2523/824B01J2523/845
Inventor 艾利杰闫淑娟张令华卢圣涛李智洋李鲁胜仇洪波杨凤岭孙德山
Owner SHANDONG GUOSHUN CONSTR GRP
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