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

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.

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Study of Ce, Sb, and Y exchanged titania nanotubes and superior catalytic performance for the selective catalytic reduction of NOx

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2021.119939 ◽

2021 ◽

Vol 287 ◽

pp. 119939

Author(s):

Devaiah Damma ◽

Dimitrios K. Pappas ◽

Thirupathi Boningari ◽

Panagiotis G. Smirniotis

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Titania Nanotubes ◽

Reduction Of Nox

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Catalytic performance of Al2O3/SiO2/TiO2 loaded with V2O5 for the selective catalytic reduction of NOx with ammonia

Catalysis Today ◽

10.1016/s0920-5861(97)00116-8 ◽

1998 ◽

Vol 40 (1) ◽

pp. 27-37 ◽

Cited By ~ 24

Author(s):

Nicolaos Economidis ◽

Robert F Coil ◽

Panagiotis G Smirniotis

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Reduction Of Nox

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

RSC Advances ◽

10.1039/c5ra22234f ◽

2015 ◽

Vol 5 (127) ◽

pp. 104923-104931 ◽

Cited By ~ 26

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.

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NiyCo1-yMn2Ox microspheres for the selective catalytic reduction of NOx with NH3: The synergetic effects between Ni and Co for improving low-temperature catalytic performance

Applied Catalysis A General ◽

10.1016/j.apcata.2018.04.033 ◽

2018 ◽

Vol 560 ◽

pp. 1-11 ◽

Cited By ~ 16

Author(s):

Jian-Wen Shi ◽

Ge Gao ◽

Zhaoyang Fan ◽

Chen Gao ◽

Baorui Wang ◽

...

Keyword(s):

Low Temperature ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Synergetic Effects ◽

Reduction Of Nox

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Effect of the calcination temperature of cerium–zirconium mixed oxides on the structure and catalytic performance of WO3/CeZrO2 monolithic catalyst for selective catalytic reduction of NOx with NH3

RSC Advances ◽

10.1039/c7ra03054a ◽

2017 ◽

Vol 7 (39) ◽

pp. 24177-24187 ◽

Cited By ~ 15

Author(s):

Haidi Xu ◽

Mengmeng Sun ◽

Shuang Liu ◽

Yuanshan Li ◽

Jianli Wang ◽

...

Keyword(s):

Low Temperature ◽

Selective Catalytic Reduction ◽

Lewis Acid ◽

Mixed Oxides ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Acid Sites ◽

Lewis Acid Sites ◽

Reduction Of Nox ◽

Calcined Temperature

The calcined temperature of the carrier obviously affected SCR activity of catalysts, WO3/Ce0.68Zr0.32O2-500 showed the best low-temperature NH3-SCR activity due to its more Lewis acid sites and stronger redox property.

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

Catalysis Science & Technology ◽

10.1039/c5cy02278a ◽

2016 ◽

Vol 6 (17) ◽

pp. 6688-6696 ◽

Cited By ~ 57

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.

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

Applied Sciences ◽

10.3390/app8122430 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2430 ◽

Cited By ~ 1

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.

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The Enhanced Performance of N-Modified Activated Carbon Promoted with Ce in Selective Catalytic Reduction of NOx with NH3

Catalysts ◽

10.3390/catal10121423 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1423

Author(s):

Marwa Saad ◽

Agnieszka Szymaszek ◽

Anna Białas ◽

Bogdan Samojeden ◽

Monika Motak

Keyword(s):

Catalytic Activity ◽

Activated Carbon ◽

Low Temperature ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Reduction Mechanism ◽

Modified Activated Carbon ◽

Oxidation Reduction ◽

Reduction Of Nox

The goal of the study was to modify activated carbon (AC) with nitrogen groups and ceria and to test the obtained materials in low temperature selective catalytic reduction of nitrogen oxides. For that purpose, the starting AC was oxidized with HNO3 of various concentrations, modified with urea and doped with 0.5 wt.% of Ce. It was observed that the increased concentration of acid influenced the catalytic activity, since textural and surface chemistry of activated carbon was changed. The most active sample was that modified with 14 M HNO3 and it reached 96% of NO conversion at 300 °C. Additionally, the addition of Ce improved the catalytic performance of modified AC, and NO was reduced according to oxidation–reduction mechanism, characteristic for supported metal oxides. Nevertheless, the samples promoted with Ce emitted significantly higher amount of CO2 comparing to the non-promoted ones.

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