A composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof

A denitrification catalyst and composite metal technology, applied in the field of environmental protection catalytic materials and air pollution control, can solve the problems of not having water resistance and sulfur resistance, achieve excellent resistance to sulfur poisoning, and maintain the effect of denitrification activity

Active Publication Date: 2014-03-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patents CN200710188005.1, CN200610165430.4, etc. disclose oxides or composite oxide catalysts of transition metals and rare earth metals that can achieve good denitrification activity at 300-450°C, but in fact, most of these catalysts only contain It shows high denitrification ability only under sulfur and anhydrous conditions, and does not have long-term water and sulfur resistance performance, which has certain limitations for practical applications.

Method used

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  • A composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof
  • A composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof
  • A composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of active component impregnation solution

[0027] 1.95g Ce(SO 4 ) 2 4H 2 O was dissolved in a certain amount of deionized water to obtain Ce(SO 4 ) 2 solution, to the Ce(SO 4 ) 2 The solution was mixed with 1.09g NiSO 4 ·6H 2 O was stirred and dissolved to obtain a stable solution with a sulfate mass fraction of 6.1%. In addition, the same Ce(SO 4 ) 2 The solution was mixed with 0.72g MnSO 4 ·H 2 O, 1gCuSO 4 ·5H 2 O, 0.64g SnSO 4 A stable solution was obtained.

[0028] (2) Loading of active components

[0029] Add 20 g of TiO to the above active solution 2 The carrier was stirred at 70°C for 2 hours with a magnetic stirrer, and viscous slurry was obtained after the water in the solution was evaporated;

[0030] (3) Catalyst molding and roasting

[0031] The above viscous slurry is stale for 24 hours, then extruded into a long strip with a diameter of 3mm through a vacuum extruder, dried at 80°C for 10h, and finally baked in a muffle f...

Embodiment 2

[0035] (1) Preparation of active component impregnation solution

[0036] 0.24g Ce(SO 4 ) 2 4H 2 O was dissolved in a certain amount of deionized water to obtain Ce(SO 4 ) 2 solution, and then doped with 0.31g NiSO 4 ·6H 2 O stirring and dissolving, obtaining sulfate massfraction is 5.5% stable solution;

[0037] (2) Loading of active components

[0038] Add 20 g of TiO to the above active solution 2 The carrier was stirred at 80°C for 1 hour with a magnetic stirrer, and viscous slurry was obtained after the water in the solution was evaporated;

[0039] (3) Catalyst molding and roasting

[0040] The above viscous slurry is stale for 30 hours, then extruded into a strip shape with a diameter of 3mm through a vacuum extruder, dried at 70°C for 8 hours, and finally baked in a muffle furnace at 400°C for 5 hours to obtain the flue gas SCR DeNOx catalyst with TiO 2 Carrier quality as the benchmark, in which the active component Ce(SO 4 ) 2 The mass percentage is 1%, a...

Embodiment 3

[0044] (1) Preparation of active component impregnation solution

[0045] 0.61g Ce(SO 4 ) 2 4H 2 O was dissolved in a certain amount of deionized water to obtain Ce(SO 4 ) 2 solution, then add 0.25g SnSO 4 , stirring and dissolving to obtain a sulfate mass fraction of 7.8% stable solution;

[0046] (2) Loading of active components

[0047] Add 20 g of TiO to the above active solution 2 The carrier was stirred at 90°C for 3 hours with a magnetic stirrer, and a viscous slurry was obtained after the water in the solution was evaporated;

[0048] (3) Catalyst molding and roasting

[0049] The above viscous slurry is stale for 40 hours, then extruded into a strip shape with a diameter of 3mm through a vacuum extruder, dried at 100°C for 10h, and finally baked in a muffle furnace at 550°C for 4 hours to obtain the flue gas SCR DeNOx catalyst with TiO 2 Carrier quality as the benchmark, in which the active component Ce(SO 4 ) 2 The mass percentage is 2.5%, and the mass ra...

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Abstract

The invention relates to a composite metal sulfate system flue-gas-denitration catalyst and a preparation method thereof, and belongs to the technical fields of environmental-friendly catalytic materials and atmospheric pollution control. The catalyst and the preparation method thereof are characterized in that titanium dioxide is used as a carrier, ceric sulfate is used as an active component, and a transition-metal sulfate is used as a cocatalyst; the weight percent of the active component of the catalyst is 1-25% based on the weight of the carrier; and the weight ratio of the active component to the auxiliary is 1: (0.1-0.9). The catalyst is prepared by utilization of a direct sulfate-dipping method. Compared with technical performances of selective catalytic reduction (SCR) denitration catalysts at present, the catalyst provided by the invention broadens the middle/high-temperature denitration active temperature window, and enhances vapor-poison tolerance and sulfur dioxide poison tolerance of the catalyst significantly. The preparation technology of the catalyst is simple, environmental friendly, cheap, and free of secondary pollution.

Description

technical field [0001] The invention relates to a composite metal sulfate-based flue gas denitrification catalyst and a preparation method thereof, belonging to the technical fields of environmental protection catalytic materials and air pollution control. Background technique [0002] NO x It is one of the main pollutants of air pollution. Atmospheric NO x A series of problems that can cause acid rain, photochemical smog and other damage to the ecological environment and endanger human health. my country is the world's largest NO x For the emitting countries, the loss caused by acid rain pollution exceeds 100 billion yuan every year. At present, the selective catalytic reduction (SCR) method using ammonia as the reducing agent has become the mainstream technology for flue gas denitrification because of its stability, high efficiency and economy. [0003] At present, most commercial SCR catalysts use TiO 2 as the carrier, V 2 o 5 as the main active component, and loa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/83B01J23/14B01J23/34B01J23/835B01D53/56B01D53/86
Inventor 祝社民雷天起沈岳松沈树宝
Owner NANJING UNIV OF TECH
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