The selective catalytic reduction of NOx over a Cu/ZSM-5/SAPO-34 composite catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104923-104931 ◽  
Author(s):  
Jixing Liu ◽  
Weiyu Song ◽  
Chi Xu ◽  
Jian Liu ◽  
Zhen Zhao ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Mass Fraction ◽  
Catalytic Reduction ◽  
Composite Catalyst ◽  
Composite Catalysts ◽  
Scr Of No ◽  
Reduction Of Nox ◽  
Seed Method ◽  
Catalytic Performances

A series of Cu/ZSM-5/SAPO-34 composite catalysts with varying ZSM-5 mass fraction were synthesized using a pre-seed method, and their catalytic performances were tested for selective catalytic reduction (SCR) of NO with NH3.

Ultralow loading of nanostructured Mn species onto two-dimensional Co3O4 nanosheets for selective catalytic reduction of NOx with NH3

2020 ◽  
Vol 10 (10) ◽  
pp. 3450-3457
Author(s):  
Kang Zheng ◽  
Zhiyuan Zhou ◽  
Yongzhao Wang ◽  
Zhiling Xin ◽  
Zhiliang Zhao ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Two Dimensional ◽  
Scr Of No ◽  
Mn Species ◽  
Reduction Of Nox

We report a facile method for dispersing Mn species onto two-dimensional Co3O4 nanosheets at the nanoscale for the selective catalytic reduction (SCR) of NOx with NH3.

Novel Fe–Ce–Ti catalyst with remarkable performance for the selective catalytic reduction of NOx by NH3

2016 ◽  
Vol 6 (17) ◽  
pp. 6688-6696 ◽  
Author(s):  
Zhiming Liu ◽  
Yuxian Liu ◽  
Biaohua Chen ◽  
Tianle Zhu ◽  
Lingling Ma
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Redox Cycle ◽  
Reaction Intermediates ◽  
Scr Of No ◽  
Reduction Of Nox

The redox cycle (Ce4+ + Fe2+ ↔ Ce3+ + Fe3+) over the Fe–Ce–Ti catalyst contributes to the activation of NOx and NH3 and thus the formation of reaction intermediates, leading to the high catalytic performance for the NH3-SCR of NOx.

scholarly journals A CeO2/ZrO2-TiO2 Catalyst for the Selective Catalytic Reduction of NOx with NH3

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 592 ◽  
Author(s):  
Wenpo Shan ◽  
Yang Geng ◽  
Yan Zhang ◽  
Zhihua Lian ◽  
Hong He
Keyword(s):  
Selective Catalytic Reduction ◽  
Ph Value ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Excellent Activity ◽  
Reduction Of Nox ◽  
High Space ◽  
Catalytic Performances ◽  
High Space Velocity

In this study, CeZr0.5TiaOx (with a = 0, 1, 2, 5, 10) catalysts were prepared by a stepwise precipitation approach for the selective catalytic reduction of NOx with NH3. When Ti was added, all of the Ce-Zr-Ti oxide catalysts showed much better catalytic performances than the CeZr0.5Ox. Particularly, the CeZr0.5Ti2Ox catalyst showed excellent activity for broad temperature range under high space velocity condition. Through the control of pH value and precipitation time during preparation, the function of the CeZr0.5Ti2Ox catalyst could be controlled and the structure with highly dispersed CeO2 (with redox functions) on the surface of ZrO2-TiO2 (with acidic functions) could be obtained. Characterizations revealed that the superior catalytic performance of the catalyst is associated with its outstanding redox properties and adsorption/activation functions for the reactants.

Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability

2019 ◽  
Vol 9 (1) ◽  
pp. 106-115 ◽  
Author(s):  
Yulong Shan ◽  
Xiaoyan Shi ◽  
Jinpeng Du ◽  
Yunbo Yu ◽  
Hong He
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
Scr Of No ◽  
Reduction Of Nox

The Cu-exchanged RTH-type zeolites (Cu-RTH) were applied in ammonia-selective catalytic reduction (NH3-SCR) of NOx.

scholarly journals Assessing the effect of reducing agents on the selective catalytic reduction of NOx over Ag/Al2O3 catalysts

2016 ◽  
Vol 6 (6) ◽  
pp. 1661-1666 ◽  
Author(s):  
Carmine D'Agostino ◽  
Sarayute Chansai ◽  
Isabelle Bush ◽  
Chensong Gao ◽  
Mick D. Mantle ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalyst Activity ◽  
Nmr Relaxation ◽  
Reducing Agents ◽  
Time Analysis ◽  
Wet Impregnation ◽  
Scr Of No ◽  
Reduction Of Nox ◽  
Nmr Relaxation Time

The selective catalytic reduction (SCR) of NOx in the presence of different reducing agents over Ag/Al2O3 prepared by wet impregnation was investigated by probing catalyst activity and using NMR relaxation time analysis.

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 Mn/SAPO-34 as an efficient catalyst for the low-temperature selective catalytic reduction of NOx with NH3

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32146-32154 ◽  
Author(s):  
Chengkai Pang ◽  
Yuqun Zhuo ◽  
Qiyu Weng
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Excess Oxygen ◽  
Efficient Catalyst ◽  
Scr Of No ◽  
Reduction Of Nox

A series of Mn-exchanged SAPO-34 catalysts were synthesized and developed as catalysts for the low temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen.

Catalysts based on pillared interlayered clays for the selective catalytic reduction of NO

Clay Minerals ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 123-134 ◽  
Author(s):  
S. Perathoner ◽  
A. Vaccari
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Reduction Of No ◽  
Cu Content ◽  
Scr Of No ◽  
Catalytic Behaviour ◽  
Reduced Rate ◽  
Cu Ions ◽  
Catalytic Performances

AbstractThe reactivity of an Al-pillared interlayered clay (PILC) (AZA) and a mixed Fe/Al-PILC (FAZA), used as references by the Concerted European Action-Pillared Layered Structure (CEA-PLS), was investigated in the selective catalytic reduction (SCR) of NO by NH3 or propane, as either catalysts or as supports of Cu ions. Both AZA and FAZA, either with or without Cu were found to be inactive in the reduction of NO with propane and oxygen. This is different from the behaviour with alumina with or without Cu, because of the different surface acidity properties. Good NO conversions were observed for both PILCs using NH3. The best catalytic performances were shown by FAZA, but the activity of AZA was also remarkable. The addition of Cu ions to both AZA and FAZA leads to an improvment in the activity in NO conversion and a reduction in the side formation of N2O. The catalytic behaviour was found to depend on the method of Cu addition, the Cu loading and the nature of the PILC. With AZA the best results were obtained for a Cu content up to 2 wt%, while further increases in the amount of Cu resulted in a considerable decrease in the conversion of NO. With FAZA, on the other hand, a high activity was observed at up to 3% of Cu introduced by ion exchange. By comparison with other Cu containing catalysts, Cu-FAZA allows operation in a wider range of reaction temperatures due to the reduced rate of side ammonia combustion. The surface acidity properties of AZA and FAZA were also characterized to interpret the above effects.

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