LnxPdyTi1−x−yO6 Catalysts: Formation of Oxygen Vacancy and Identification of the Active Site for CO Oxidation

2009 ◽  
Vol 113 (10) ◽  
pp. 4161-4167 ◽  
Author(s):  
Fang Wang ◽  
Gongxuan Lu
Keyword(s):  
Oxygen Vacancy ◽  
Co Oxidation ◽  
Active Site

Oxygen vacancy promoted CO oxidation over Pt/CeO 2 catalysts: A reaction at Pt–CeO 2 interface

2014 ◽  
Vol 314 ◽  
pp. 725-734 ◽  
Author(s):  
Huan-Huan Liu ◽  
Yu Wang ◽  
Ai-Pin Jia ◽  
Shu-Yuan Wang ◽  
Meng-Fei Luo ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Co Oxidation

Oxygen Vacancy Promoted O2 Activation over Perovskite Oxide for Low-Temperature CO Oxidation

ACS Catalysis ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 9751-9763 ◽  
Author(s):  
Ji Yang ◽  
Siyu Hu ◽  
Yarong Fang ◽  
Son Hoang ◽  
Li Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Vacancy ◽  
Co Oxidation ◽  
Perovskite Oxide ◽  
O2 Activation ◽  
Low Temperature Co Oxidation

Elucidating the Nature of the Cu(I) Active Site in CuO/TiO2 for Excellent Low-Temperature CO Oxidation

2020 ◽  
Vol 12 (6) ◽  
pp. 7091-7101 ◽  
Author(s):  
Yarong Fang ◽  
Xiao Chi ◽  
Li Li ◽  
Ji Yang ◽  
Shoujie Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Site ◽  
Low Temperature Co Oxidation

scholarly journals Insights into the Oxygen Vacancy Filling Mechanism in CuO/CeO2 Catalysts: A Key Step Toward High Selectivity in Preferential CO Oxidation

ACS Catalysis ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 6532-6545 ◽  
Author(s):  
Arantxa Davó-Quiñonero ◽  
Esther Bailón-García ◽  
Sergio López-Rodríguez ◽  
Jerónimo Juan-Juan ◽  
Dolores Lozano-Castelló ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Co Oxidation ◽  
High Selectivity ◽  
Preferential Co Oxidation ◽  
Filling Mechanism

CO oxidation on PdO catalysts with perfect and defective rutile-TiO2 as supports: Elucidating the role of oxygen vacancy in support by DFT calculations

2017 ◽  
Vol 401 ◽  
pp. 49-56 ◽  
Author(s):  
Xiao Li ◽  
Xiongfei Sun ◽  
Xianglan Xu ◽  
Wenming Liu ◽  
Honggen Peng ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Dft Calculations ◽  
Co Oxidation ◽  
Rutile Tio2

scholarly journals Performance controlled via surface oxygen-vacancy in Ti-based oxide catalyst during methyl oleate epoxidation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Supareak Praserthdam ◽  
Meena Rittiruam ◽  
Kanokpon Maungthong ◽  
Tinnakorn Saelee ◽  
Siriwimol Somdee ◽  
...  
Keyword(s):  
Active Region ◽  
Oxygen Vacancy ◽  
Methyl Oleate ◽  
Active Site ◽  
Catalyst Deactivation ◽  
Energy Gap ◽  
Oxide Catalysts ◽  
Surface Oxygen ◽  
Spent Catalyst ◽  
Surface Oxygen Vacancy

Abstract The catalytic performance with high conversion and high selectivity of Ti-based oxide catalysts have been widely investigated. Besides, stability, which is an essential parameter in the industrial process, lacked fundamental understanding. In this work, we combined computational and experimental techniques to provide insight into the deactivation of P25 and TS-1 Ti-based oxide catalysts during the methyl oleate (MO) epoxidation. The considered deactivation mechanisms are fouling and surface oxygen vacancy (OV). The fouling causes temporary catalyst deactivation through active site blockage but can be removed via calcination in air at high temperature. However, in this work, the OV formation plays an important role in the overall performance of the spent catalyst as the deactivated catalyst after regeneration, cannot be restored to the initial activity. Also, the effects of OV in spent catalysts caused (i) the formation of more Ti3+ species on the surface as evident by XPS and Bader charge analysis, (ii) the activity modification of the active region on the catalyst surface as the reduction in energy gap (Eg) occurred from the formation of the interstates observed in the density of states profiles of spent catalyst modeled by the O-vacant P25 and TS-1 models. This reduction in Eg affects directly the strength of Ti–OOH active site and MO bonding, in which high binding energy contributes to a low conversion because the MO needed an O atom from Ti–OOH site to form the methyl-9,10-epoxy stearate. Hence, the deactivation of the Ti-based oxide catalysts is caused not only by the insoluble by-products blocking the active region but also mainly from the OV. Note that the design of reactive and stable Ti-based oxide catalysts for MO epoxidation needed strategies to prevent OV formation that permanently deactivated the active region. Thus, the interrelation and magnitude between fouling and OV formation on catalyst deactivation will be investigated in future works.

In-situ active site formation in CO oxidation on alumina

1998 ◽  
Vol 24 (4) ◽  
pp. 401-410 ◽  
Author(s):  
S. Gallardo ◽  
T. Aida ◽  
H. Niiyama
Keyword(s):  
Co Oxidation ◽  
Active Site ◽  
Site Formation
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