Reaction Mechanism of Low-Temperature Selective Catalytic Reduction of NOx over Fe-Mn Oxides Supported on Fly-Ash-Derived SBA-15 Molecular Sieves: Structure–Activity Relationships and in Situ DRIFT Analysis

2018 ◽  
Vol 122 (35) ◽  
pp. 20210-20231 ◽  
Author(s):  
Ge Li ◽  
Baodong Wang ◽  
Zhencui Wang ◽  
Zenghe Li ◽  
Qi Sun ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Fly Ash ◽  
Molecular Sieves ◽  
Catalytic Reduction ◽  
Structure Activity ◽  
Drift Analysis ◽  
Reduction Of Nox ◽  
In Situ Drift ◽  
Mn Oxides

scholarly journals A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOx with NH3: reaction mechanism and catalyst deactivation

RSC Advances ◽  
2017 ◽  
Vol 7 (42) ◽  
pp. 26226-26242 ◽  
Author(s):  
Shengen Zhang ◽  
Bolin Zhang ◽  
Bo Liu ◽  
Shuailing Sun
Keyword(s):  
Reaction Mechanism ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalyst Deactivation ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Scr Catalysts ◽  
Reduction Of Nox

The reactions over Mn-containing selective catalytic reduction (SCR) catalysts.

In situ DRIFT study on NH3 selective catalytic reduction of NO over HBEA zeolite doped with CeO2

2020 ◽  
Vol 506 ◽  
pp. 144715 ◽  
Author(s):  
Yun Shi ◽  
Xiaoxiang Wang ◽  
Liang Chen ◽  
Sujing Li ◽  
Chao Wu ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
In Situ Drift

scholarly journals In Situ DRIFTS Studies of NH3-SCR Mechanism over V2O5-CeO2/TiO2-ZrO2 Catalysts for Selective Catalytic Reduction of NOx

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1307 ◽  
Author(s):  
Yaping Zhang ◽  
Xiupeng Yue ◽  
Tianjiao Huang ◽  
Kai Shen ◽  
Bin Lu
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Oxygen Storage ◽  
In Situ Drifts ◽  
Nh3 Scr ◽  
Nh3 Adsorption ◽  
Reduction Of Nox ◽  
Zro2 Catalyst

TiO2-ZrO2 (Ti-Zr) carrier was prepared by a co-precipitation method and 1 wt. % V2O5 and 0.2 CeO2 (the Mole ratio of Ce to Ti-Zr) was impregnated to obtain the V2O5-CeO2/TiO2-ZrO2 catalyst for the selective catalytic reduction of NOx by NH3. The transient activity tests and the in situ DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) analyses were employed to explore the NH3-SCR (selective catalytic reduction) mechanism systematically, and by designing various conditions of single or mixing feeding gas and pre-treatment ways, a possible pathway of NOx reduction was proposed. It was found that NH3 exhibited a competitive advantage over NO in its adsorption on the catalyst surface, and could form an active intermediate substance of -NH2. More acid sites and intermediate reaction species (-NH2), at lower temperatures, significantly promoted the SCR activity of the V2O5-0.2CeO2/TiO2-ZrO2 catalyst. The presence of O2 could promote the conversion of NO to NO2, while NO2 was easier to reduce. The co-existence of NH3 and O2 resulted in the NH3 adsorption strength being lower, as compared to tests without O2, since O2 could occupy a part of the active site. Due to CeO2’s excellent oxygen storage-release capacity, NH3 adsorption was weakened, in comparison to the 1 wt. % V2O5-0.2CeO2/TiO2-ZrO2 catalyst. If NOx were to be pre-adsorbed in the catalyst, the formation of nitrate and nitro species would be difficult to desorb, which would greatly hinder the SCR reaction. All the findings concluded that NH3-SCR worked mainly through the Eley-Rideal (E-R) mechanism.

Synergy of vanadia and ceria in the reaction mechanism of low-temperature selective catalytic reduction of NOx by NH3

2020 ◽  
Vol 391 ◽  
pp. 145-154
Author(s):  
Wenshuo Hu ◽  
Renzhi Zou ◽  
Yi Dong ◽  
Shuo Zhang ◽  
Hao Song ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of Nox

Activity and SO2 resistance of amorphous CeaTiOx catalysts for the selective catalytic reduction of NO with NH3: in situ DRIFT studies

2016 ◽  
Vol 6 (19) ◽  
pp. 7151-7162 ◽  
Author(s):  
Zhiping Zhang ◽  
Liqiang Chen ◽  
Zhibin Li ◽  
Pengying Li ◽  
Fulong Yuan ◽  
...  
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Strong Interactions ◽  
Sulfur Resistance ◽  
Reduction Of No ◽  
Scr Of No ◽  
So2 Resistance ◽  
In Situ Drift

Amorphous Ce0.3TiOx exhibits a high activity and sulfur resistance for NH3-SCR of NO due to the strong interactions between Ce and Ti.

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