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A cerium-titanium-tin composite oxide catalyst for flue gas denitrification and its preparation method

A technology of catalysts and oxides, which is applied in the field of cerium-titanium-tin composite oxide catalysts, can solve the problems of toxicity, catalyst specific surface area reduction, and catalyst activity reduction, and achieve the effects of simple equipment, simple and fast preparation methods, and simple preparation methods

Inactive Publication Date: 2016-08-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, V 2 o 5 -WO 3 (or MO 3 ) / TiO 2 The active component of the catalyst V 2 o 5 Toxic, anatase TiO in catalyst 2 The carrier is easy to crystallize into rutile TiO at high temperature 2 , leading to a decrease in the specific surface area of ​​the catalyst, thereby reducing the activity of the catalyst

Method used

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  • A cerium-titanium-tin composite oxide catalyst for flue gas denitrification and its preparation method
  • A cerium-titanium-tin composite oxide catalyst for flue gas denitrification and its preparation method
  • A cerium-titanium-tin composite oxide catalyst for flue gas denitrification and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0022] Example 1. CeO 2 / Ti x sn1-x o 2 Catalyst preparation

[0023] TiCl 4 (x mol·L -1 ) ethanol solution and SnCl 4 (1-x mol L -1 )[0.25≤x≤0.75] equal volumes of the aqueous solution were mixed uniformly, under vigorous stirring, ammonia water was added dropwise into the mixed solution until the pH of the solution=9.0, and the precipitation was complete, aged overnight, and the Cl was washed away - , dried at 110°C, and then calcined at 550°C for 4h in an air atmosphere in a muffle furnace to obtain Ti x sn 1-x o 2 solid solution. Prepare 0.1mol·L -1 Ce(NO 3 ) 3 ·6H 2 O solution, and then impregnated the above solution in Ti x sn 1-x o 2 carrier to make CeO 2 The mass fraction accounts for 7.5% of the total mass of the catalyst, stirred for 3h, evaporated to dryness in an oil bath at 100°C, dried at 110°C for 12h, and calcined at 500°C for 4h in an air atmosphere. The sample is marked as 7.5Ce / Ti x sn 1-x , with TiO 2 or SnO 2 The supported catalysts ar...

Embodiment 2

[0026] Example 2. NH of the catalyst 3 -SCR performance evaluation

[0027] The catalyst prepared in embodiment 1 is applied to NH 3 -SCR reaction, 7.5Ce / Ti x sn 1-x Exhibits good catalytic activity superior to that of single-component supports, in the absence of SO 2 and H 2 Under the condition of O, the activity window of the catalyst prepared after optimizing the Ti-Sn composition is wider than that of industrial catalysts. The results are shown in figure 2 . Meanwhile, 7.5Ce / Ti 0.5 sn 0.5 The performance of the catalyst aged at high temperature (750oC) is better than that of the Ce / Ti catalyst without high temperature aging, which proves that the Ce / TiSn catalyst has excellent thermal stability. The reaction is carried out on a micro-reaction catalytic device, and the reaction gas composition is 500ppm NH 3 , 500ppmNO, 5%O 2 , the residual gas is N 2 , the airspeed is 100,000h -1 , the catalyst dosage is 0.1 g , the temperature of the catalytic reaction is 15...

Embodiment 3

[0028] Embodiment 3 different content CeO 2 / Ti 0.5 sn 0.5 o 2 Catalyst NH 3 -SCR performance evaluation

[0029] Prepare different content CeO according to the method in embodiment 1 2 / Ti 0.5 sn 0.5 o 2 Catalyst, CeO 2 The loadings of are respectively x (x=4.5%-22.5%) of the total mass of the catalyst, and the samples are marked as xCe / TiSn. Simultaneously, according to the method in embodiment 2 to the NH of catalyst 3 -SCR performance is evaluated, the results are shown in image 3 . It can be found that in the selected CeO 2 The Ce / TiSn catalysts both showed excellent NO conversion and N 2 selective.

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Abstract

The invention discloses a CeO2 / TixSn(1-x)O2 composite oxide denitration catalyst which takes a TixSn (1-x)O2(O<x<1) solid solution as a carrier and is used for ammonia selectivity catalytic denitration. The preparation method provided by the invention comprises the following steps of uniformly mixing a TiCl4 ethanol solution and SnCl4 water solution according to a certain titanium-tin molar ratio, dropwise adding the ammonia in a mixed solution while acutely stirring until the PH of the solution is 9.0; completely depositing and aging overnight; washing away Cl<->, drying at 110 DEG C, and roasting at 550 DEG C for 4h in a muffle furnace under an air atmosphere to obtain a TixSn (1-x)O2; and with the TixSn (1-x)O2 solid solution as a carrier, loading an active constituent CeO2 by adopting an immersion method, stirring for 3h, carrying out oil bath, steaming out the moisture at 100 DEG C, drying for 12h at 110 DEG C, and roasting for 4h at 500 DEG C or 750 DEG C in an air atmosphere to obtain a CeO2 / TixSn(1-x)O2 composite oxide catalyst. The catalyst provided by the invention has the advantages that the specific surface area is large, the heating stability is good, the catalyst has higher NH3-SCR activity compared with single-component carrier, the water-resistant and sulfur resisting properties are excellent, the catalyst is an environment-friendly catalyst, meanwhile, the preparation method of the catalyst is simple, the equipment is simple, and the raw materials are cheap and are easily available.

Description

Technical field: [0001] The invention relates to a cerium-titanium-tin composite oxide catalyst for the purpose of flue gas denitrification. Background technique: [0002] Nitrogen oxides (NOx) are the main air pollutants, and it is the chief culprit of photochemical smog and acid rain, which directly threatens the ecological environment. Therefore, countries all over the world pay more and more attention to the issue of NOx emission control and treatment. Ammonia selective catalytic reduction technology (NH 3 -SCR) is widely used in the denitrification treatment of industrial boilers and power plant units due to its high denitrification efficiency and relatively low operating costs. Currently, successfully operating commercial NH 3 -SCR catalyst is a V 2 o 5 -WO 3 (or MO 3 ) / TiO 2 catalyst. The catalyst is characterized by a NOx removal efficiency of more than 80% in coal-fired boiler power plants, and has good sulfur resistance performance, and its working tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14B01D53/86B01D53/56
Inventor 董林张雷汤常金高飞邓昱熊燕李露露曹原
Owner NANJING UNIV