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.

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 Ultrafast synthesis of AFX-Type zeolite with enhanced activity in the selective catalytic reduction of NOx and hydrothermal stability

RSC Advances ◽  
2019 ◽  
Vol 9 (29) ◽  
pp. 16790-16796 ◽  
Author(s):  
Anand Chokkalingam ◽  
Watcharop Chaikittisilp ◽  
Kenta Iyoki ◽  
Sye Hoe Keoh ◽  
Yutaka Yanaba ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
Enhanced Activity ◽  
Type Zeolite ◽  
Reduction Of Nox

SSZ-16 (AFX-type) zeolite prepared in 2 h, so far the fastest, shows enhanced hydrothermal-stability and activity in selective-catalytic-reduction 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 Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites

2021 ◽  
Author(s):  
Yulong Shan ◽  
Jinpeng Du ◽  
Yan Zhang ◽  
Wenpo Shan ◽  
Xiaoyan Shi ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
Catalyst Design ◽  
Scr Catalyst ◽  
Nh3 Scr ◽  
Small Pore ◽  
Fast Scr ◽  
Reduction Of Nox ◽  
Significant Opportunity

Abstract Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NOx with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance, and synthetic methodology. The review gives a valuable summary of new insights on the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.

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