Influence of Fe Doping on Ce-Mn/TiO2-ZrO2 Catalysts for Low-Temperature Selective Catalytic Reduction of NO

2014 ◽  
Vol 898 ◽  
pp. 447-451 ◽  
Author(s):  
Yun Xiao Teng ◽  
Cun Yi Song ◽  
Xi Ning Lu ◽  
Zhen Song Tong ◽  
Yu San Qin
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Sol Gel ◽  
Molar Ratio ◽  
Fe Doping ◽  
Reduction Of No ◽  
No Conversion ◽  
Scr Of No ◽  
Fe Catalysts

Fe-Ce-Mn catalysts loaded on TiO2-ZrO2materials were prepared by sol-gel method and then were investigated for low temperature selective catalytic reduction (SCR) of NO with NH3. It was found that the NO conversions over Fe-Ce-Mn/TiO2-ZrO2was slightly improved compared with that over Ce-Mn/TiO2-ZrO2. The results showed that 96% NO conversion was obtained over Fe-Ce-Mn/TiO2-ZrO2with the molar ratio of Fe/Mn=0.3. A comparative study of Fe-Ce-Mn/TiO2- ZrO2and Ce-Mn/TiO2-ZrO2for NO conversions at 140°C in the presence of H2O and SO2proved that Fe-Ce-Mn/TiO2-ZrO2exhibited higher resistance to H2O and SO2than that of without Fe catalysts. In addition, Fe-Ce-Mn/TiO2-ZrO2presented 90.49% NO conversion after cutting off the injection of SO2and H2O.

Theoretical Design of Transition Metal-Doped TiO2 for the Selective Catalytic Reduction of NO with NH3 by DFT Calculations

2022 ◽  
Author(s):  
Huiling Zheng ◽  
Renjie Li ◽  
Chengming Zhong ◽  
Zhi Li ◽  
Yikun Kang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Selective Catalytic Reduction ◽  
Transition Metal Oxides ◽  
Catalytic Reduction ◽  
Trade Off ◽  
Reduction Of No ◽  
Theoretical Design ◽  
Scr Of No ◽  
Metal Doped

Many transition metal oxides supported on TiO2 have been studied for selective catalytic reduction (SCR) of NO with NH3. However, the trade-off exists between the low-temperature activity and N2 selectivity....

Highly dispersed Fe2O3 on carbon nanotubes for low-temperature selective catalytic reduction of NO with NH3

2015 ◽  
Vol 51 (5) ◽  
pp. 956-958 ◽  
Author(s):  
Zhenping Qu ◽  
Lei Miao ◽  
Hui Wang ◽  
Qiang Fu
Keyword(s):  
Carbon Nanotubes ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
No Conversion ◽  
Highly Dispersed

Highly dispersed Fe2O3 nanoparticles supported on CNTs showed excellent NO conversion, selectivity and durability towards SO2/H2O at low temperatures (200–325 °C).

scholarly journals Physicochemical and Catalytic Properties of Vanadia/Titania Catalysts. V. Selective Catalytic Reduction of NO with NH3

2002 ◽  
Vol 20 (10) ◽  
pp. 937-945
Author(s):  
Th. El-Nabarawy ◽  
M.N. Alaya ◽  
S.A. Sayed Ahmed ◽  
A.M. Youssef
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Impregnation Method ◽  
Reduction Of No ◽  
No Conversion ◽  
Scr Of No ◽  
Monolayer Coverage

Vanadia/titania catalysts were prepared containing 6.0 or 8.0 wt% V2O5 via the impregnation method. The samples as prepared were calcined at 400°C or 600°C, respectively. Selective catalytic reduction (SCR) of NO with NH3 was carried out at 257°C over the prepared catalysts. NO conversion as a function of time was followed and the stationary conversion versus the amount of catalyst employed was also investigated. It was found that the vanadia/titania catalysts calcined at 400°C were more active in the SCR of NO with NH3 relative to those calcined at 600°C. This was attributed to such catalysts possessing complete monolayer coverage of vanadia on the titania substrate. It was established that V5+ was not the active vanadia species but V4+ and V3+ may act as such for the SCR of NO with NH3.

Studies on the Preparation and DeNOx Performance of MnxOy/CNTs Catalyst for Low-Temperature Selective Catalytic Reduction

2013 ◽  
Vol 798-799 ◽  
pp. 231-234 ◽  
Author(s):  
Bing Nan Ren ◽  
Qiao Wen Yang
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Impregnation Method ◽  
Active Components ◽  
Reaction Conditions ◽  
No Conversion ◽  
Scr Of No

The metal oxide catalyst was prepared by loading MnxOyon carbon nanotubes (CNTs) with impregnation method. Then the catalyst was characterized by BET, TEM and XPS, and the catalytic activity of the catalyst for selective catalytic reduction (SCR) of NO at low-temperature was investigated. The results showed that the species of active components loaded on the catalyst were MnO2and Mn2O3. The NO conversion was improved with reduction temperature increase under 250°C, increased slowly over 250°C. The O2content had an outstanding effect on NO conversion of catalysts at a low concentration range. Once the oxygen content was enhanced over 5%, there was no significant increase in the NO conversion. With the increasing of space velocity, the NO conversion rate was decreased under the reaction conditions.

scholarly journals Enhancing the low temperature NH3-SCR activity of FeTiOx catalysts via Cu doping: a combination of experimental and theoretical study

RSC Advances ◽  
2018 ◽  
Vol 8 (34) ◽  
pp. 19301-19309 ◽  
Author(s):  
Kai Cheng ◽  
Weiyu Song ◽  
Ying Cheng ◽  
Huiling Zheng ◽  
Lu Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Theoretical Study ◽  
Catalytic Reduction ◽  
Sol Gel ◽  
Cu Doping ◽  
Reduction Of No ◽  
Gel Method ◽  
Nh3 Scr ◽  
Catalytic Performances

A series of FeαCu1−αTiOx catalysts with variable Cu doping amounts was directly synthesized by the sol–gel method and their catalytic performances were tested for the selective catalytic reduction of NO with ammonia.

Limited Ce doped Ni–Co as a highly efficient catalyst for H2-SCR of NO with good resistance to SO2 and H2O at low temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 91930-91939 ◽  
Author(s):  
Xuanxuan Cai ◽  
Wei Sun ◽  
Waqas Qamar Zaman ◽  
Limei Cao ◽  
Ji Yang
Keyword(s):  
Reaction Mechanism ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Good Resistance ◽  
Efficient Catalyst ◽  
Reduction Of No ◽  
Highly Efficient ◽  
Scr Of No

The reaction mechanism of the selective catalytic reduction of NO by hydrogen over Ni1−xCexCo1.95Pd0.05O4 catalysts.

Modification of Nano Spherical-Like MnOx/TiO2 Catalysts with F-Doped

2017 ◽  
Vol 898 ◽  
pp. 1896-1904
Author(s):  
Jun Lin Xie ◽  
Feng Xiang Li ◽  
Hai Feng Cui ◽  
Feng He ◽  
Kai Qi
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Spherical Particle ◽  
Surface Area ◽  
Catalytic Reduction ◽  
Sol Gel ◽  
Acid Sites ◽  
Scr Of No ◽  
Structures And Properties

A series of spherical-like MnOx/TiO2 catalysts with F-doped were prepared by using sol-gel method and investigated for low-temperature selective catalytic reduction (SCR) of NOx with NH3 at the temperature ranging from 100 °C to 200 °C. The 0.07Ce-MnOx/TiO2 catalyst shows the highest activity and yields 95% NO conversion at 200 °C. With the help of XRD, TGA, H2-TPR, NH3-TPD, BET and TEM, the structures and properties of the catalysts were characterized. The results show that it is a fine modifier for TiO2 support with appropriate amounts of F doping, and F ions can enter into TiO2 lattice, reducing the formation of rutile TiO2 and the crystallization of MnOx. However, MnTiO3 was generated in the catalysts with excess F doping. This would cause larger diameter of spherical particle and smaller surface area. But the amounts of the surface acid sites increased, and the reduction ability of catalysts was enhanced, which is beneficial for catalytic activity of the catalysts.

Effect of Fe on the Selective Catalytic Reduction of NO by NH3 at Low Temperature over Mn/CeO2-TiO2 Catalyst

2012 ◽  
Vol 27 (5) ◽  
pp. 495-500 ◽  
Author(s):  
Da-Wang WU ◽  
Qiu-Lin ZHANG ◽  
Tao LIN ◽  
Mao-Chu GONG ◽  
Yao-Qiang CHEN
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No
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