Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

2019 ◽  
Vol 4 (6) ◽  
pp. 1050-1058 ◽  
Author(s):  
Taekyung Ryu ◽  
Yonjoo Kang ◽  
In-Sik Nam ◽  
Suk Bong Hong
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Aging ◽  
Reduction Of No ◽  
Nh3 Scr ◽  
Scr Catalysts ◽  
High Silica

Iron-exchanged high-silica LTA zeolites exhibit high activity for selective catalytic reduction of NOx by NH3, even after hydrothermal aging at 900 °C.

The synergistic effects between Ce and Cu in CuyCe1−yW5Ox catalysts for enhanced NH3-SCR of NOx and SO2 tolerance

2019 ◽  
Vol 9 (3) ◽  
pp. 718-730 ◽  
Author(s):  
Jian-Wen Shi ◽  
Yao Wang ◽  
Ruibin Duan ◽  
Chen Gao ◽  
Baorui Wang ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Synergistic Effects ◽  
Reduction Of No ◽  
Nh3 Scr ◽  
So2 Tolerance ◽  
Scr Of Nox

Non-manganese-based metal oxides are promising catalysts for the NH3-SCR (selective catalytic reduction) of NOx at low temperatures.

A Ce-Zr-Ti Oxide Catalyst for Selective Catalytic Reduction of NO with Ammonia

2014 ◽  
Vol 535 ◽  
pp. 709-712
Author(s):  
Ye Jiang ◽  
Yan Yan ◽  
Shan Bo Huang ◽  
Xiong Zhang ◽  
Xin Wei Wang ◽  
...  
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Impregnation Method ◽  
Reduction Of No ◽  
No Conversion ◽  
Temperature Range ◽  
Ti Oxides

A Ce-Zr-Ti oxide catalyst was prepared by an impregnation method and tested for the selective catalytic reduction of NO with NH3. The Ce-Zr-Ti oxide catalyst exhibited high activity and more than 95% NO conversion was obtained within the temperature range 300-500 °C at the high gas hourly space velocity of 50,000 h-1. The addition of Zr improved the activity of Ce-Ti oxides especially at higher reaction temperatures and their resistance to SO2.

Deactivation of Mn/TiO2 catalyst for NH3-SCR reaction: effect of phosphorous

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11226-11232 ◽  
Author(s):  
Ning-zhi Yang ◽  
Rui-tang Guo ◽  
Qing-shan Wang ◽  
Wei-guo Pan ◽  
Qi-lin Chen ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Deactivation Mechanism

The deactivation mechanism of phosphorous on a Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3 was investigated in this study.

scholarly journals Ce regulated surface properties of Mn/SAPO-34 for improved NH3-SCR at low temperature

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40047-40054
Author(s):  
Qizhi Chen ◽  
Yong Yang ◽  
Hang Luo ◽  
Zuohua Liu ◽  
Zhangfa Tong ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Surface Properties ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Nh3 Scr

Ce modified MnOx/SAPO-34 was prepared and investigated for low-temperature selective catalytic reduction of NOx with ammonia (NH3-SCR).

Activity and SO2 resistance of amorphous CeaTiOx catalysts for the selective catalytic reduction of NO with NH3: in situ DRIFT studies

2016 ◽  
Vol 6 (19) ◽  
pp. 7151-7162 ◽  
Author(s):  
Zhiping Zhang ◽  
Liqiang Chen ◽  
Zhibin Li ◽  
Pengying Li ◽  
Fulong Yuan ◽  
...  
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Strong Interactions ◽  
Sulfur Resistance ◽  
Reduction Of No ◽  
Scr Of No ◽  
So2 Resistance ◽  
In Situ Drift

Amorphous Ce0.3TiOx exhibits a high activity and sulfur resistance for NH3-SCR of NO due to the strong interactions between Ce and Ti.

scholarly journals Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1324
Author(s):  
Feng Gao
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Short Review ◽  
Industrial Applications ◽  
Zeolite Catalysts ◽  
Hydrothermal Aging ◽  
Theoretical Approaches ◽  
Fe Species ◽  
Scr Catalysts ◽  
Small Pore

Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.

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.

scholarly journals Visible-light-assisted selective catalytic reduction of NO with NH3 on porphyrin derivative-modified TiO2 photocatalysts

2015 ◽  
Vol 5 (1) ◽  
pp. 556-561 ◽  
Author(s):  
Akira Yamamoto ◽  
Yuto Mizuno ◽  
Kentaro Teramura ◽  
Saburo Hosokawa ◽  
Tetsuya Shishido ◽  
...  
Keyword(s):  
Visible Light ◽  
High Activity ◽  
Selective Catalytic Reduction ◽  
Visible Light Irradiation ◽  
Catalytic Reduction ◽  
Light Irradiation ◽  
Tio2 Photocatalysts ◽  
Reduction Of No ◽  
Porphyrin Derivative

Porphyrin derivative-modified TiO2 photocatalysts exhibited high activity for photo-assisted selective catalytic reduction of NO with NH3 (NH3-SCR) under visible-light irradiation.

High activity and wide temperature window of Fe-Cu-SSZ-13 in the selective catalytic reduction of NO with ammonia

AIChE Journal ◽  
2015 ◽  
Vol 61 (11) ◽  
pp. 3825-3837 ◽  
Author(s):  
Tao Zhang ◽  
Jianmei Li ◽  
Jian Liu ◽  
Daxi Wang ◽  
Zhen Zhao ◽  
...  
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Temperature Window
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