SO2 poisoning resisting flue gas denitration catalyst and preparation method thereof

A denitration catalyst and catalyst technology are applied in the directions of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., which can solve the problems of complex catalyst production process, decreased denitration conversion rate, poisoning, etc., and achieve good mechanical properties and difficult sintering. , the effect of large surface area

Inactive Publication Date: 2011-05-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this catalyst, the active component CuO is easily absorbed by SO 2 Poisoning, after 70 hours, the denitrification conversion rate drops rapidly (0-20%)
[0011] Novel CuSO 4 -CeO 2 / TS catalyst low temperature NH 3 A novel catalyst CuSO was introduced in NO reduction and anti-poisoning performance 4 -CeO 2 / TS, the catalyst is in SO 2 Under the existing conditions, the denitrification activity remains unchanged (95%) in a short period of time (33h), and the catalyst production process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Prepare 5 wt% CuSO 4 The precursor solution is then mixed with the same volume of the catalyst prepared in the first step. The impregnated sample is dehydrated and dried in a drying oven at a constant temperature of 110°C, and then calcined in a muffle furnace at 400°C. get loaded CuSO 4 catalyst.

[0033] (2) The obtained catalyst CuSO 4 / γ-Al 2 o 3 4.7 g was put into the reaction tube of a fixed-bed reactor with a diameter of 2 cm and a length of 55 cm, and simulated flue gas was introduced. The specific ingredients are:

[0034] Air: 200ml / min

[0035] NO: 250ml / min

[0036] NH 3 : 250ml / min

[0037] The reaction temperature is 100-450°C, and the space velocity is 9000h -1 , NH 3 : NO = 1.1, detect NO, NH with RAEGuard EC sensor 3 After 200 hours, the conversion rate of NO was 86.3% at 350°C.

Embodiment 2

[0039] (1) Prepare 5 wt% CuSO 4 The precursor solution is then mixed with the same volume of the catalyst prepared in the first step. The impregnated sample is dehydrated and dried in a drying oven at a constant temperature of 110°C, and then calcined in a muffle furnace at 400°C. get loaded CuSO 4 catalyst.

[0040] (2) The obtained catalyst CuSO 4 / γ-Al 2 o 3 4.7 g was put into the reaction tube of a fixed-bed reactor with a diameter of 2 cm and a length of 55 cm, and simulated flue gas was introduced. The specific ingredients are:

[0041]Air: 200ml / min

[0042] NO: 250ml / min

[0043] NH 3 : 250ml / min

[0044] SO 2 : 107.6ml / min

[0045] The reaction temperature is 100-450°C, and the space velocity is 9000h -1 , NH 3 :NO = 1.1, NO, NH detected with RAEGuard EC sensor 3 , SO 2 The inlet and outlet concentrations, after 200 hours of reaction, the NO conversion rate was 55% at 350°C.

Embodiment 3

[0047] (1) The catalyst active component Ce(NO 3 ) 3 ·6H 2 O (as CeO 2 Calculated) to prepare a 2.0 wt% precursor solution, and then mixed with γ-Al 2 o 3 Beads are mixed in equal volumes, the impregnated samples are dehydrated and dried, dried in a drying oven at a constant temperature of 110°C, and then calcined in a muffle furnace at 400°C to obtain supported CeO 2 catalyst.

[0048] (2) Prepare 5 wt% CuSO 4 The precursor solution is then mixed with the same volume of the catalyst prepared in the first step. The impregnated sample is dehydrated and dried in a drying oven at a constant temperature of 110°C, and then calcined in a muffle furnace at 400°C. get loaded CuSO 4 , CeO 2 catalyst.

[0049] (3) The obtained catalyst CuSO 4 / CeO 2 / γ-Al 2 o 3 4.7 g was put into the reaction tube of a fixed-bed reactor with a diameter of 2 cm and a length of 55 cm, and simulated flue gas was introduced. The specific ingredients are:

[0050] Air: 200ml / min

[0051] NO: ...

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PUM

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Abstract

The invention provides an SO2 poisoning resisting flue gas denitration catalyst for denitrating flue gas in a thermal power plant. The catalyst is prepared by an impregnation method and comprises the following three parts in percentage by weight: 0.5 to 10.0 percent of active ingredient (CuSO4), 0.5 to 5.0 percent of cocatalyst (CeO2), and the balance of catalyst carrier (gamma-Al2O3). The catalyst is suitable for selective catalytic reduction (SCR) denitration and has the characteristic that: the catalyst can keep over 55 percent of denitration conversion rate at the space velocity of 9,000h<-1> and the temperature of between 100 and 450 DEG C in the presence of SO2, wherein a ratio of NH3 to NO is 1.1, and reaction time is 200 hours.

Description

technical field [0001] The present invention relates to a kind of catalyst, relate in particular to a kind of anti-SO 2 A poisoned catalyst used in selective catalytic reduction (SCR) denitrification of flue gas in a thermal power plant and a preparation method thereof. Background technique [0002] In recent years, my country's economy has developed rapidly, and power demand and supply have continued to grow. my country's thermal power installed capacity has risen from 391.37 million kilowatts in 2004 to 601.32 million kilowatts in 2008, and NOx emissions have also increased accordingly. Although my country's environmental protection work has made great progress, the NOx pollution problem has not been effectively controlled, and the impact of thermal power air pollutants on the ecological environment will become more and more serious. [0003] In order to meet the strict requirements of environmental protection regulations and reduce the emission of nitrogen oxides in the...

Claims

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Application Information

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IPC IPC(8): B01J27/055B01D53/90B01D53/56
Inventor 王慧李长顺孙俭刘晓娟陈芃王瑶刘艳兴
Owner SHANGHAI UNIV
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