Role of sulphates on the mechanism of NH3-SCR of NO at low temperatures over presulphated vanadium supported on carbon-coated monoliths

An inhibitory effect of excessive NH3 on NH3-SCR on CeWOx at low temperatures was found, and H2O rendered the inhibitory effect insignificant for standard SCR.

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Excellent low-temperature NH3-SCR of NO activity and resistance to H2O and SO2 over WaCeOx (a=0.06, 0.12, 0.18, 0.24) catalysts: Key role of acidity derived from tungsten addition

Applied Catalysis A General ◽

10.1016/j.apcata.2021.118374 ◽

2021 ◽

pp. 118374

Author(s):

Huansheng Tan ◽

Shibo Ma ◽

Xiaoyu Zhao ◽

Yushi Li ◽

Chen Zhao ◽

...

Keyword(s):

Low Temperature ◽

Nh3 Scr ◽

Scr Of No

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SO2 promoted V2O5-MoO3/TiO2 catalyst for NH3-SCR of NO at low temperatures

Applied Catalysis A General ◽

10.1016/j.apcata.2018.10.040 ◽

2019 ◽

Vol 570 ◽

pp. 42-50 ◽

Cited By ~ 26

Author(s):

Yunfan Xu ◽

Xiaodong Wu ◽

Qiwei Lin ◽

Jianfeng Hu ◽

Rui Ran ◽

...

Keyword(s):

Low Temperatures ◽

Tio2 Catalyst ◽

Nh3 Scr ◽

Scr Of No

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On the nature of oxygen groups for NH3-SCR of NO over carbon at low temperatures

Chemical Engineering Journal ◽

10.1016/j.cej.2015.01.086 ◽

2015 ◽

Vol 270 ◽

pp. 41-49 ◽

Cited By ~ 31

Author(s):

Qianqian Guo ◽

Wen Jing ◽

Yaqin Hou ◽

Zhanggen Huang ◽

Guoqiang Ma ◽

...

Keyword(s):

Low Temperatures ◽

Nh3 Scr ◽

Scr Of No ◽

Oxygen Groups

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Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NOx with NH3: Role of Cu Species and Reaction Mechanism

Catalysts ◽

10.3390/catal11020221 ◽

2021 ◽

Vol 11 (2) ◽

pp. 221

Author(s):

Guangying Fu ◽

Junwen Chen ◽

Yuqian Liang ◽

Rui Li ◽

Xiaobo Yang ◽

...

Keyword(s):

Reaction Mechanism ◽

Selective Catalytic Reduction ◽

Low Temperatures ◽

Catalytic Reduction ◽

Oxidation Activity ◽

Paramagnetic Resonance ◽

Nh3 Scr ◽

Nh3 Oxidation ◽

Diffuse Reflectance Infrared

The role of Cu species in Cu ion-exchanged IM-5 zeolite (Cu-IM-5) regarding the performance in selective catalytic reduction (SCR) of NOx with NH3 (NH3-SCR) and the reaction mechanism was studied. Based on H2 temperature-programmed reduction (H2-TPR) and electron paramagnetic resonance (EPR) results, Cu–O–Cu and isolated Cu species are suggested as main Cu species existing in Cu-IM-5 and are active for SCR reaction. Cu–O–Cu species show a good NH3-SCR activity at temperatures below 250 °C, whereas their NH3 oxidation activity at higher temperatures hinders the SCR performance. At low temperatures, NH4NO3 and NH4NO2 are key reaction intermediates. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) suggests a mixed Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanism over Cu-IM-5 at low temperatures.

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