Rare earth ions (La, Nd, Sm, Gd, and Tm) regulate the catalytic performance of CeO2/Al2O3 for NH3-SCR of NO

2017 ◽  
Vol 32 (12) ◽  
pp. 2438-2445 ◽  
Author(s):  
Qijie Jin ◽  
Yuesong Shen ◽  
Shemin Zhu ◽  
Huiyuan Li ◽  
Yanbao Li
Keyword(s):  
Rare Earth ◽  
Catalytic Performance ◽  
Rare Earth Ions ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Image Position

Abstract

scholarly journals Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 55
Author(s):  
Katarzyna Świrk ◽  
Ye Wang ◽  
Changwei Hu ◽  
Li Li ◽  
Patrick Da Costa ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Experimental Conditions ◽  
One Pot ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Temperature Programmed ◽  
Stationary Sources

Copper and iron promoted ZrO2 catalysts were prepared by one-pot synthesis using urea. The studied catalysts were characterized by XRD, N2 physisorption, XPS, temperature-programmed desorption of NH3 (NH3-TPD), and tested by the selective catalytic reduction by ammonia (NH3-SCR) of NO in the absence and presence of water vapor, under the experimental conditions representative of exhaust gases from stationary sources. The influence of SO2 on catalytic performance was also investigated. Among the studied catalysts, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N2. The addition of SO2 markedly improved NO and NH3 conversions during NH3-SCR in the presence of H2O. The improvement in acidic surface properties is believed to be the cause.

Synergistic effect of VOx and MnOx surface species for improved performance of V2O5/Ce0.5Ti0.5−xMnxO2−δ catalysts in low-temperature NH3-SCR of NO

2018 ◽  
Vol 8 (24) ◽  
pp. 6360-6374 ◽  
Author(s):  
Thanh Huyen Vuong ◽  
Stephan Bartling ◽  
Ursula Bentrup ◽  
Henrik Lund ◽  
Jabor Rabeah ◽  
...  
Keyword(s):  
Low Temperature ◽  
Synergistic Effect ◽  
Catalytic Performance ◽  
Surface Species ◽  
Nh3 Scr ◽  
Redox Couples ◽  
Scr Of No ◽  
Improved Performance

Inserting adjacent Mn3+/Mn2+ and VO3+/VO2+ redox couples in Ce1−xTixO2 improves catalytic performance.

Promotional effect of Ba additives on MnCeOx/TiO2 catalysts for NH3-SCR of NO at low temperature

2018 ◽  
Vol 33 (16) ◽  
pp. 2414-2422 ◽  
Author(s):  
Youchun Pan ◽  
Yuesong Shen ◽  
Qijie Jin ◽  
Shemin Zhu
Keyword(s):  
Low Temperature ◽  
Nh3 Scr ◽  
Promotional Effect ◽  
Scr Of No ◽  
Image Position

Abstract

Transition metal ions regulate the catalytic performance of Ti0.8M0.2Ce0.2O2+x for the NH3-SCR of NO: the acidic mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7597-7603 ◽  
Author(s):  
Yuesong Shen ◽  
Yun Su ◽  
Yifan Ma
Keyword(s):  
Transition Metal Ions ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Acid Strength ◽  
Maximum Activity ◽  
Lewis Acid Sites ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Temperature Window ◽  
Active Temperature

The maximum activity is dependent on the number of Lewis acid sites, and the active temperature window is dependent on the acid strength.

scholarly journals Selective Catalytic Reduction of NO with NH3 over Ce-W-Ti Oxide Catalysts Prepared by Solvent Combustion Method

2018 ◽  
Vol 8 (12) ◽  
pp. 2430 ◽  
Author(s):  
Xinbo Zhu ◽  
Yaolin Wang ◽  
Yu Huang ◽  
Yuxiang Cai
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Combustion Method ◽  
Catalytic Performance ◽  
Solution Combustion ◽  
X Ray ◽  
Nh3 Scr ◽  
Scr Of No ◽  
Temperature Programmed

In this work, a series of Ce-W-Ti catalysts were synthesized using a solution combustion method for the selective catalytic reduction (SCR) of NO with NH3 at low temperatures. The reaction performance of NH3-SCR of NO was significantly improved over the Ce-W-Ti catalysts compared to Ce0.4Ti and W0.4Ti catalysts, while Ce0.2W0.2Ti showed the best activity among all the samples. The Ce0.2W0.2Ti catalyst exhibited over 90% removal of NO and 100% N2 selectivity in the temperature range of 250–400 °C at a gas hourly space velocity (GHSV) of 120,000 mL·g−1·h−1. The Ce-W-Ti catalysts were characterized using N2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectrometry and temperature programmed desorption of NH3 to establish the structure-activity relationships of the Ce-W-Ti catalysts. The excellent catalytic performance of the Ce0.2W0.2Ti catalyst could be associated with the larger specific surface area, highly dispersed Ce and W species, increased amount of surface adsorbed oxygen (Oads) and enhanced total acidity on the catalyst surfaces.

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

scholarly journals Fe-Containing Zeolites for NH3 -SCR of NO x : Effect of Structure, Synthesis Procedure, and Chemical Composition on Catalytic Performance and Stability

2017 ◽  
Vol 23 (54) ◽  
pp. 13404-13414 ◽  
Author(s):  
Nuria Martín ◽  
Peter N. R. Vennestrøm ◽  
Joakim R. Thøgersen ◽  
Manuel Moliner ◽  
Avelino Corma
Keyword(s):  
Chemical Composition ◽  
Catalytic Performance ◽  
Nh3 Scr ◽  
Structure Synthesis ◽  
Scr Of No ◽  
Synthesis Procedure ◽  
Effect Of Structure

Ce doping to Cu-SAPO-18: Enhanced catalytic performance for the NH3-SCR of NO in simulated diesel exhaust

2019 ◽  
Vol 276 ◽  
pp. 133-146 ◽  
Author(s):  
Shuai Han ◽  
Jin Cheng ◽  
Qing Ye ◽  
Shuiyuan Cheng ◽  
Tianfang Kang ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Catalytic Performance ◽  
Nh3 Scr ◽  
Scr Of No
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