NO oxidation over Co-La catalysts and NO<sub><i>x</i></sub> reduction in compact SCR

doi:10.1007/s11783-017-0906-x

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (2) : 4 https://doi.org/10.1007/s11783-017-0906-x

RESEARCH ARTICLE

NO oxidation over Co-La catalysts and NO_x reduction in compact SCR

Tiejun Zhang¹,Jian Li^1,²(

),Hong He^1,²,Qianqian Song¹,Quanming Liang¹

¹. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China
². Beijing Key Laboratory for Green Catalysis and Separation, Beijing University of Technology, Beijing 100124, China

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Abstract

The Co-La catalyst (pH= 1) exhibited maximum NO conversion of 43% at 180°C.

Acid modified catalyst enhanced the resistance to SO₂.

The formed sulfates may block the pore structure of the catalyst.

The NO conversion of compact SCR was 91% at 180°C at the highest space velocity.

A series of Co-La catalysts were prepared using the wet impregnation method and the synthesis of catalysts were modified by controlling pH with the addition of ammonium hydroxide or oxalic solution. All the catalysts were systematically investigated for NO oxidation and SO₂ resistance in a fixed bed reactor and were characterized by Brunanuer–Emmett–Teller (BET) method, Fourier Transform infrared spectroscopy (FTIR), X–ray diffraction (XRD), Thermogravimetric (TG) and Ion Chromatography (IC). Among the catalysts, the one synthesized at pH= 1 exhibited the maximum NO conversion of 43% at 180°C. The activity of the catalyst was significantly suppressed by the existence of SO₂ (300 ppm) at 220°C. Deactivation may have been associated with the generation of cobalt sulfate, and the SO₂ adsorption quantity of the catalyst might also have effected sulfur resistance. In the case of the compact selective catalytic reduction (SCR), the activity increased from 74% to 91% at the highest gas hourly space velocity (GHSV) of 300000 h⁻¹ when the NO catalyst maintained the highest activity, in excess of 50% more than that of the standard SCR.

Keywords NO catalytic oxidation pH effect Low temperature Sulfur dioxide High space velocity SCR

Corresponding Author(s): Jian Li

Issue Date: 10 April 2017

Cite this article:

Tiejun Zhang,Jian Li,Hong He, et al. NO oxidation over Co-La catalysts and NO_x reduction in compact SCR[J]. Front. Environ. Sci. Eng., 2017, 11(2): 4.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0906-x
https://academic.hep.com.cn/fese/EN/Y2017/V11/I2/4

Fig.1 Experimental apparatus for the catalytic testing: (a) 1 N₂, 2 O₂, 3 NO, 4 SO₂, 5 mass flow meter (D08 – 4B/ZM, qixinghuachuang Co., Ltd. Beijing, China) , 6 mixing drum, 7 quartz tube reactor, 8 tubular reactor, 9 thermocouple, 10 flue gas analyzer (Testo 350, Testo Co., Germany), 11 temperature controller (CKW – 1100, Chaoyang Automatic Factory, Beijing, China); (b) 1 N₂, 2 O_2, 3 NO, 4 mass flow meter (D08 – 4B/ZM, qixinghuachuang Co., Ltd. Beijing, China), 5 mixing drum, 6 thermocouple, 7 quartz tube reactor, 8 tubular reactor, 9 temperature controller, 10 flue gas analyzer (Testo 350, Testo Co., Germany), 11 NH₃

Fig.2 NO oxidation performance of different catalysts from pH= 1 to pH= 14: (a) pH=1–7, (b) pH=8–14

Reaction condition: [NO] = 700 ppm, [O₂] = 5 vol%, N₂ balance, GHSV= 27000 h^-¹

Fig.3 Effect of SO₂ on the activity of catalysts with different pH: (a) effect of SO₂ on NO conversion, (b) breakthrough curves of SO₂

Reaction conditions: [NO] = 700 ppm; [O₂] = 5 vol%, [SO₂] = 300 ppm, N₂ balance, GHSV= 27000 h^-¹

Tab.1 Micro-structure of catalysts

Fig.4 FT-IR and ion chromatography spectra of the catalyst: (a) FTIR spectra of the catalyst, (b) IC spectra of the fresh catalyst, (c) IC spectra of the spent catalyst

Fig.5 XRD patterns of fresh Co-La and the catalyst after reacting under SO₂: (a) catalyst (pH= 1), (b) catalyst (pH= 1) after sulfur test, (c) catalyst (pH= 10), (d) catalyst (pH= 10) after sulfur test

Fig.6 Thermal gravimetric analysis of fresh catalysts and poisoned catalysts

Fig.7 NO conversion of the compact SCR

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