Effect of Ni doping in NixMn1−xTi10 (x = 0.1–0.5) on activity and SO2 resistance for NH3-SCR of NO studied with in situ DRIFTS

2017 ◽  
Vol 7 (15) ◽  
pp. 3243-3257 ◽  
Author(s):  
Liqiang Chen ◽  
Rui Li ◽  
Zhibin Li ◽  
Fulong Yuan ◽  
Xiaoyu Niu ◽  
...  
Keyword(s):  
Ni Doping ◽  
In Situ Drifts ◽  
No Conversion ◽  
Nh3 Scr ◽  
Ti Oxides ◽  
Scr Of No ◽  
So2 Resistance

The Ni0.4Mn0.6Ti10 catalyst exhibits excellent SO2 resistance, high NO conversion and N2 selectivity in the range of 190–360 °C even in the presence of 100 ppm SO2 and 15% H2O under a GHSV of 40 000 h−1 due to the interaction among Mn, Ni and Ti oxides.

scholarly journals Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 618
Author(s):  
Huan Du ◽  
Zhitao Han ◽  
Xitian Wu ◽  
Chenglong Li ◽  
Yu Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalyst Surface ◽  
Impregnation Method ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Nh3 Adsorption ◽  
So2 Resistance ◽  
Fast Scr

Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. DRIFTS.

Time-resolved in situ DRIFTS study on NH3–SCR of NO on CeO2/TiO2 catalyst

2022 ◽  
Author(s):  
Jie Yang ◽  
Shan Ren ◽  
Mingming Wang ◽  
Zhicaho Chen ◽  
Lin Chen ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Time Resolved ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Scr Of No

Ce–Ti catalysts were considered as promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, CeO2/TiO2 catalyst was...

In situ DRIFTS and temperature-programmed technology study on NH3-SCR of NO over Cu-SSZ-13 and Cu-SAPO-34 catalysts

2014 ◽  
Vol 156-157 ◽  
pp. 428-437 ◽  
Author(s):  
Lei Ma ◽  
Yisun Cheng ◽  
Giovanni Cavataio ◽  
Robert W. McCabe ◽  
Lixin Fu ◽  
...  
Keyword(s):  
Technology Study ◽  
In Situ Drifts ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Temperature Programmed

In situ-DRIFTS Study of Sb–V–CeO2/TiO2 Catalyst Under Standard and Fast NH3-SCR Conditions

2017 ◽  
Vol 60 (9-11) ◽  
pp. 755-762 ◽  
Author(s):  
Young Eun Jeong ◽  
Pullur Anil Kumar ◽  
Danh Thi Huong ◽  
Heon Phil Ha ◽  
Kwan-Young Lee
Keyword(s):  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr

H3-SCR of NO over M/ZSM-5 (M = Mn, Co, Cu) catalysts: An in-situ DRIFTS study

2022 ◽  
pp. 101722
Author(s):  
Hongyan Xue ◽  
Xiaoming Guo ◽  
Tao Meng ◽  
Dongsen Mao ◽  
Zhen Ma
Keyword(s):  
In Situ Drifts ◽  
Scr Of No ◽  
Cu Catalysts

MnO2–Graphene-oxide-scroll–TiO2 composite catalyst for low-temperature NH3-SCR of NO with good steam and SO2 resistance obtained by low-temperature carbon-coating and selective atomic layer deposition

2019 ◽  
Vol 9 (7) ◽  
pp. 1602-1608 ◽  
Author(s):  
Liwei Sun ◽  
Kai Li ◽  
Zeshu Zhang ◽  
Xuefeng Hu ◽  
Heyuan Tian ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Atomic Layer Deposition ◽  
Carbon Coating ◽  
Atomic Layer ◽  
Composite Catalyst ◽  
Nh3 Scr ◽  
Layer Deposition ◽  
Scr Of No ◽  
So2 Resistance

Coating GO at low temperature and selectively depositing TiO2 on oxygen-containing functional groups on GO.

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.

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.

Spinel-structured Mn–Ni nanosheets for NH3-SCR of NO with good H2O and SO2 resistance at low temperature

2020 ◽  
Vol 10 (22) ◽  
pp. 7486-7501
Author(s):  
Fengyu Gao ◽  
Xiaolong Tang ◽  
Zaharaddeen Sani ◽  
Honghong Yi ◽  
Shunzheng Zhao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Electronic Interaction ◽  
Adsorption Ability ◽  
Nh3 Scr ◽  
Scr Of No ◽  
So2 Resistance

High specific surface area, more NH3 adsorption ability and efficient electronic interaction over Mn–Ni spinel nanosheet leaded to good SCR activity, and Ni-outside with active Mn-inner spinel configuration and nanosheet morphology relieved SO2-poisoning.

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