Selective catalytic reduction of NOx with NH3 assisted by non-thermal plasma over CeMnZrOx@TiO2 core-shell catalyst

2021 ◽  
Author(s):  
Tao Zhu ◽  
Xing Zhang ◽  
Zhenguo Li ◽  
Xiaoning Ren ◽  
Baodong Wang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Thermal Plasma ◽  
Catalytic Reduction ◽  
Core Shell ◽  
Reduction Of Nox ◽  
Non Thermal Plasma

Fe2O3@SiTi core–shell catalyst for the selective catalytic reduction of NOx with NH3: activity improvement and HCl tolerance

2018 ◽  
Vol 8 (13) ◽  
pp. 3313-3320 ◽  
Author(s):  
Huazhen Chang ◽  
Tao Zhang ◽  
Hao Dang ◽  
Xiaoyin Chen ◽  
Yanchen You ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Core Shell ◽  
Scr Of No ◽  
Reduction Of Nox

A core–shell structured Fe2O3@SiTi catalyst with a SiTi shell and Fe2O3 core was prepared and used for the selective catalytic reduction (SCR) of NOx with NH3.

scholarly journals Selective Catalytic Reduction of NO by NH3 Using a Combination of Non-Thermal Plasma and Mn-Cu/ZSM5 Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1044
Author(s):  
Tao Zhu ◽  
Xing Zhang ◽  
Wenfeng Niu ◽  
Yatao Liu ◽  
Bo Yuan ◽  
...  
Keyword(s):  
Energy Density ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Removal Efficiency ◽  
Thermal Plasma ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
High Energy ◽  
No Removal ◽  
Non Thermal Plasma

Dielectric barrier discharge (DBD) could generate non-thermal plasma (NTP) with the advantage of fast reactivity and high energy under atmosphere pressure and low-temperature. The presented work investigated the selective catalytic reduction (SCR) of nitric oxide (NO) using a combination of NTP and an Mn-Cu/ZSM5 catalyst with ammonia (NH3) as a reductant. The experimental results illustrate that the plasma-assisted SCR process enhances the low-temperature catalytic performance of the Mn-Cu/ZSM5 catalyst significantly, and it exhibits an obvious improvement in the NO removal efficiency. The reaction temperature is maintained at 200 °C in order to simulate the exhaust temperature of diesel engine, and the 10% Mn-8% Cu/ZSM5 catalyst shows the highest NO removal performance with about 93.89% at an energy density of 500 J L−1 and the selectivity to N2 is almost 99%. The voltage, frequency and energy density have a positive correlation to NO removal efficiency, which is positively correlated with the power of NTP system. In contrast, the O2 concentration has a negative correlation to the NO removal, and the NO removal efficiency cannot be improved when the NO removal process reaches reaction equilibrium in the NTP system.

scholarly journals Non-thermal-plasma-activated de-NO x catalysis

2017 ◽  
Vol 376 (2110) ◽  
pp. 20170054 ◽  
Author(s):  
Rahman Gholami ◽  
Cristina E. Stere ◽  
Alexandre Goguet ◽  
Christopher Hardacre
Keyword(s):  
Adsorption Capacity ◽  
Selective Catalytic Reduction ◽  
Thermal Plasma ◽  
Catalytic Reduction ◽  
Lean Burn ◽  
Reduction Activity ◽  
Reduction Efficiency ◽  
Non Thermal Plasma ◽  
The Rich ◽  
Catalyst Systems

The combination of non-thermal plasma (NTP) with catalyst systems as an alternative technology to remove NO x emissions in the exhaust of lean-burn stationary and mobile sources is reviewed. Several factors, such as low exhaust gas temperatures (below 300°C), low selectivity to N 2 and the presence of impurities, make current thermally activated technologies inefficient. Various hybrid plasma–catalyst systems have been examined and shown to have a synergistic effect on de-NO x efficiency when compared with NTP or catalyst-alone systems. The NTP is believed to form oxygenated species, such as aldehydes and nitrogen-containing organic species, and to convert NO to NO 2 , which improves the reduction efficiency of N 2 during hydrocarbon-selective catalytic reduction reactions. The NTP has been used as a pretreatment to convert NO to its higher oxidation states such as NO 2 to improve NO x reduction efficiency in the subsequent processes, e.g. NH 3 -selective catalytic reduction. It has been applied to the lean phase of the NO x storage to improve the adsorption capacity of the catalyst by conversion of NO to NO 2 . Alternatively, a catalyst with high adsorption capacity is chosen and the NTP is applied to the rich phase to improve the reduction activity of the catalyst at low temperature. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

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