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

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.

Download Full-text

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.

Download Full-text

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.

Download Full-text

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

Catalysts ◽

10.3390/catal8120592 ◽

2018 ◽

Vol 8 (12) ◽

pp. 592 ◽

Cited By ~ 9

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.

Download Full-text