Identifying the descriptor governing NO oxidation on mullite Sm(Y, Tb, Gd, Lu)Mn2O5 for diesel exhaust cleaning

2016 ◽  
Vol 6 (11) ◽  
pp. 3971-3975 ◽  
Author(s):  
Hao-Bo Li ◽  
Wei-Hua Wang ◽  
Xinyu Qian ◽  
Yahui Cheng ◽  
Xinjian Xie ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Catalytic Performance ◽  
No Oxidation

Mn-based oxides Sm(Y, Tb, Gd, Lu)Mn2O5 are synthesized to identify a general descriptor that governs the catalytic performance in NO oxidation.

scholarly journals Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

RSC Advances ◽  
2015 ◽  
Vol 5 (22) ◽  
pp. 17018-17029 ◽  
Author(s):  
Susana Quiles-Díaz ◽  
Javier Giménez-Mañogil ◽  
Avelina García-García
Keyword(s):  
Catalytic Activity ◽  
Diesel Exhaust ◽  
Environmentally Friendly ◽  
Catalytic Performance ◽  
Diesel Soot ◽  
No Oxidation ◽  
Soot Combustion ◽  
Zirconia Catalyst

A copper/ceria-zirconia catalyst was incorporated onto a DPF following an environmentally-friendly impregnation procedure. Its catalytic activity was studied for diesel exhaust NO oxidation and soot combustion reactions.

scholarly journals Superior catalytic performance of Mn-Mullite over Mn-Perovskite for NO oxidation

2018 ◽  
Vol 310 ◽  
pp. 195-201 ◽  
Author(s):  
Sampreetha Thampy ◽  
Yongping Zheng ◽  
Sean Dillon ◽  
Chengfa Liu ◽  
Yasser Jangjou ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
No Oxidation

scholarly journals Numerical Investigation on the Intraphase and Interphase Mass Transfer Limitations for NH3-SCR over Cu-ZSM-5

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1966
Author(s):  
Shiyong Yu ◽  
Jichao Zhang
Keyword(s):  
Pressure Drop ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Catalytic Performance ◽  
No Oxidation ◽  
Relative Pressure ◽  
Nh3 Scr ◽  
Nox Conversion ◽  
Nh3 Adsorption ◽  
Media Channels

A systematic modeling approach was scrutinized to develop a kinetic model and a novel monolith channel geometry was designed for NH3 selective catalytic reduction (NH3-SCR) over Cu-ZSM-5. The redox characteristic of Cu-based catalysts and the variations of NH3, NOx concentration, and NOx conversion along the axis in porous media channels were studied. The relative pressure drop in different channels, the variations of NH3 and NOx conversion efficiency were analyzed. The model mainly considers NH3 adsorption and desorption, NH3 oxidation, NO oxidation, and NOx reduction. The results showed that the model could accurately predict the NH3-SCR reaction. In addition, it was found that the Cu-based zeolite catalyst had poor low-temperature catalytic performance and good high-temperature activity. Moreover, the catalytic reaction of NH3-SCR was mainly concentrated in the upper part of the reactor. In addition, the hexagonal channel could effectively improve the diffusion rate of gas reactants to the catalyst wall, reduce the pressure drop and improve the catalytic conversion efficiencies of NH3 and NOx.

Superior low-temperature NO catalytic performance of PrMn2O5 over SmMn2O5 mullite-type catalysts

2019 ◽  
Vol 9 (11) ◽  
pp. 2758-2766 ◽  
Author(s):  
Sampreetha Thampy ◽  
Nickolas Ashburn ◽  
Chengfa Liu ◽  
Ka Xiong ◽  
Sean Dillon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
No Oxidation

PrMn2O5 is demonstrated as a superior catalyst compared to SmMn2O5 for low temperature NO oxidation, both experimentally and theoretically.

scholarly journals Study on the Effect of Structure Parameters on NO Oxidation in DBD Reactor under Oxygen-Enriched Condition

2020 ◽  
Vol 10 (19) ◽  
pp. 6766
Author(s):  
Yunkai Cai ◽  
Lin Lu ◽  
Peng Li
Keyword(s):  
Energy Efficiency ◽  
Electrode Material ◽  
Diesel Exhaust ◽  
Secondary Electron Emission ◽  
No Oxidation ◽  
Electrode Diameter ◽  
Secondary Electron Emission Coefficient ◽  
Dbd Reactor ◽  
Gas Gap ◽  
Oxidation Efficiency

To improve NO oxidation and energy efficiency, the effect of dielectric barrier discharge reactor structure on NO oxidation was studied experimentally in simulated diesel exhaust at atmospheric pressure. The mixture of 15% O2/N2 (balance)/860 ppm NOX (92% NO + 8% NO2) was used as simulated diesel exhaust. The results show that DBD reactor with 100-mm electrode length has the highest oxidation degree of NOX and energy efficiency. NO oxidation efficiency is promoted and the generation of NO is inhibited significantly by increasing the inner electrode diameter. Increasing the inner electrode diameter not only improve the E/N, but also makes the distribution of E/N more concentrated in the gas gap. The secondary electron emission coefficient (γ) of electrode material is closely related to electron energy and cannot be considered as a constant, which causes the different performance of electrode material for NO oxidation under different gas gap conditions. Compared with the rod electrode, the screw electrode has a higher electric field strength near the top of the screw, which promotes the generation of N radicals and inhibits the generation of O radicals. Rod electrode has a higher NO oxidation and energy efficiency than screw electrode under oxygen-enriched condition.

scholarly journals Investigation of the hydrothermal aging of an Mn-based mullite SmMn2O5 catalyst of NO oxidation

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 49091-49096 ◽  
Author(s):  
Lina Xue ◽  
Ka Xiong ◽  
Haijun Chen ◽  
Kyeongjae Cho ◽  
Weichao Wang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Catalytic Performance ◽  
No Oxidation ◽  
Hydrothermal Aging

The decrease in the catalytic performance for NO oxidation of the Mn-based mullite SmMn2O5 after being subjected to hydrothermal aging was mainly caused by an ∼3-fold decrease in its specific surface area (BET).

Catalytic performance of NO oxidation over LaMeO3 (Me = Mn, Fe, Co) perovskite prepared by the sol–gel method

2013 ◽  
Vol 37 ◽  
pp. 105-108 ◽  
Author(s):  
Jiahao Chen ◽  
Meiqing Shen ◽  
Xinquan Wang ◽  
Jun Wang ◽  
Yugeng Su ◽  
...  
Keyword(s):  
Sol Gel ◽  
Catalytic Performance ◽  
No Oxidation ◽  
Gel Method ◽  
Sol Gel Method

Shape-controlled synthesis of MnOx–CeO2 oxides and their catalytic performance in NO oxidation

2018 ◽  
Vol 125 (2) ◽  
pp. 663-673 ◽  
Author(s):  
Huaju Li ◽  
Qing Dong ◽  
Yanxing Li ◽  
Tan Guo ◽  
Jiadong Zhang
Keyword(s):  
Catalytic Performance ◽  
No Oxidation ◽  
Controlled Synthesis ◽  
Shape Controlled

Effect of Si/Al ratio on catalytic performance of hydrothermally aged Cu-SSZ-13 for the NH3-SCR of NO in simulated diesel exhaust

2017 ◽  
Vol 419 ◽  
pp. 382-392 ◽  
Author(s):  
Shuai Han ◽  
Jin Cheng ◽  
Changkun Zheng ◽  
Qing Ye ◽  
Shuiyuan Cheng ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Catalytic Performance ◽  
Nh3 Scr ◽  
Scr Of No
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