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Catalyst for surface sulfation of ferric oxide, as well as preparation method and application thereof

A technology of iron oxide and sulfation, which is applied in the directions of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problem that the application of medium temperature and low temperature cannot be significantly improved, the specific process of iron oxide material is not disclosed, and it is unfavorable for industrialization. application and other issues, to achieve the effects of low price, environmental friendliness, and improved reactivity

Inactive Publication Date: 2014-05-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, some researchers used the morphology-controlled synthesis method to prepare pure Fe 2 o 3 Materials (X.-Y.Yang, L.Sun, Z.-W.Huang, X.-M.Cheng, T.-W.Zhang, B.Li and X.-F.Tang, Acta Phys.-Chim .Sin.,2012,28,184. and X.Mou,B.Zhang,Y.Li,L.Yao,X.Wei,D.S.Su and W.Shen,Angew.Chem.Int.Ed.,2012,51,2989 .), also has excellent catalytic performance in SCR reaction, but these preparation methods are generally cumbersome, which is not conducive to industrial application
[0003] Lu Yuhui (Lu Yuhui, Fu Mingli, Ye Daiqi, Sulfated NO x Research Progress on Selective Catalytic Reduction and Denitration Catalysts, Industrial Catalysis, 2007, 15 (3): 20-23) and others disclosed that sulfated SCR catalysts can improve the activity and selectivity of catalysts in high temperature applications, but the medium and low temperature applications Aspects can not be significantly improved, and it does not disclose the specific process of surface sulfation of iron oxide materials

Method used

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  • Catalyst for surface sulfation of ferric oxide, as well as preparation method and application thereof
  • Catalyst for surface sulfation of ferric oxide, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A preparation method of a surface sulfated iron oxide catalyst, said method comprising the steps of:

[0058] (1) Using ferric nitrate as Fe source and ammonia water as precipitant, Fe was prepared by precipitation method 2 o 3 : Prepare a certain concentration of Fe(NO 3 ) 3 Solution, with the ammoniacal liquor of 25wt% as precipitating agent, use alkaline burette to add ammoniacal liquor dropwise in mixed solution, rate of addition is controlled at about 1 drop / second, adjust solution pH value to 9, make Fe ion precipitation completely; Precipitate is carried out Suction filtration and washing, and then place the suction filtered filter cake in an oven and dry at 100°C for 12 hours; place the dried sample in a muffle furnace, control the heating rate at 5°C / min, and place it in an air atmosphere at 500°C Roasting 3h. After roasting and cooling Fe 2 o 3 The samples were ground and sieved, and 20-60 mesh particles were selected for use.

[0059] (2) Using SO 2 I...

Embodiment 2

[0061] The same method as in Example 1 was adopted, except that the processing time of step (2) was 8 hours.

Embodiment 3

[0063] The same method as in Example 1 was adopted, except that the processing time of step (2) was 24 hours.

[0064] Take pure Fe 2 o 3 Material and embodiment 1~3 different SO 2 The surface sulfated iron oxide catalyst obtained during the treatment time, with a catalyst volume of 0.6mL and 40-60 meshes, was put into a catalyst activity evaluation device, and the activity evaluation was carried out in a fixed-bed reactor. The simulated flue gas composition is (500ppm NH 3 , 500ppm NO, 5%O 2 ), N 2 It is the balance gas, the total flow rate is 500mL / min, and the reaction space velocity is 50000h -1 . The test results are shown in Table 1 and Table 2.

[0065] Table 1 Different catalysts in NH 3 -NO in SCR reaction x Conversion rates

[0066]

[0067] Table 2 Different catalysts in NH 3 -N in SCR reaction 2 selectivity

[0068]

[0069] Pure Fe 2 o 3 MaterialNH 3 - SCR catalytic activity is very low, highest NO x The conversion rate is only about 50%, th...

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Abstract

The invention discloses a preparation method of a catalyst for surface sulfation of ferric oxide. The method comprises the following steps: (1) preparing ferric oxide; (2) performing sulfation treatment on the surface of the ferric oxide to obtain a ferric oxide catalyst of which the surface is sulfated. The ferric oxide catalyst with the enhanced surface acidity and the proper oxidation-reduction capacity is synthesized for the first time through performing sulfating process on the surface of the ferric oxide, so that the NOx purification activity of middle and high temperature sections in NH3 selectively reducing NOx (namely NH3-SCR) reaction is obviously improved, an operation temperature window is obviously broadened, and the catalyst has the extremely excellent SO2 poisoning resistance performance and is very applicable for catalytic elimination of a stationary source and a mobile source NOX.

Description

technical field [0001] The invention relates to a surface sulfated iron oxide catalyst, a preparation method and an application thereof. The catalyst is used for the selective catalytic reduction purification process of nitrogen oxides. Background technique [0002] Iron oxide (Fe 2 o 3 ) as an inexpensive and environmentally friendly catalytic material, Fe 3+ and Fe 2+ The efficient redox cycling (redox) ability exists between 3 Selective reduction of NO x (NH 3 -SCR) reaction with high activity and N 2 Generate selectivity. For example, researchers have developed loaded Fe 2 o 3 / TiO 2 (A. Kato, S. Matsuda, F. Nakajima, M. Imanari and Y. Watanabe, J. Phys. Chem., 1981, 85, 1710.), Fe 2 o 3 -pillared layered clay (J.P.Chen, M.C.Hausladen and R.T.Yang, J.Catal., 1995,151,135.), Fe 2 o 3 / SiO 2 (P. Fabrizioli, T. and A.Baiker, J.Catal., 2002, 206, 143.) and Fe 2 o 3 / WO 3 / ZrO 2 (N.Apostolescu, B.Geiger, K.Hizbullah, M.T.Jan, S.Kureti, D.Reichert, F.Schot...

Claims

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Application Information

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IPC IPC(8): B01J27/02B01D53/86B01D53/56
Inventor 贺泓刘福东丁世鹏杨卫卫连志华谢利娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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