Formation and Evolution of Carbonate Species in CO Oxidation over Mono-dispersed Fe on Graphene

Physical Chemistry Chemical Physics ◽

10.1039/d1cp00814e ◽

2021 ◽

Author(s):

Jiang Zhu ◽

Xining Feng ◽

Xin Liu ◽

Xin Zhang ◽

Yong Wu ◽

...

Keyword(s):

Co Oxidation ◽

Formation And Evolution ◽

Carbonate Species

Fe is not only the most abundant metal on the planet, but also the key component of many enzymes in organisms that are capable to catalyze many chemical conversions. Mono-dispersed...

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Formation and Evolution of Carbonate Species in Na-Doped Al2O3and V2O5-Al2O3

Spectroscopy Letters ◽

10.1080/00387018908054015 ◽

1989 ◽

Vol 22 (9) ◽

pp. 1183-1191 ◽

Cited By ~ 5

Author(s):

M. del Arco ◽

E. Hernández ◽

C. Martín ◽

V. Rives

Keyword(s):

Formation And Evolution ◽

Carbonate Species

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Insight into the Properties of Plasmonic Au/TiO2 Activated by O2/Ar Plasma

Nanomaterials ◽

10.3390/nano12010106 ◽

2021 ◽

Vol 12 (1) ◽

pp. 106

Author(s):

Xiaoqing Deng ◽

Yu Ding ◽

Xiaobing Wang ◽

Xiaojing Jia ◽

Shuo Zhang ◽

...

Keyword(s):

Photocatalytic Activity ◽

Co Oxidation ◽

Electric Discharge ◽

Nanoparticle Size ◽

Au Nanoparticle ◽

Oxygen Species ◽

Discharge Characteristics ◽

Co Chemisorption ◽

Discharge Gas ◽

Carbonate Species

The performance of CO oxidation over plasmonic Au/TiO2 photocatalysts is largely determined by the electric discharge characteristics and physicochemical properties of discharge gas. To explore the activation mechanism of Au/TiO2, an O2 and Ar mixture gas as a discharge gas was employed to activate Au/TiO2. The photocatalytic activity in CO oxidation over activated Au/TiO2 was obtained, and the electric discharge characteristics, Au nanoparticle size, surface chemical state, optical property and CO chemisorption were thoroughly characterized. As the O2 content increases from 10% to 50%, the amplitude of the current pulses increases, but the number of pulses and the discharge power decrease. The photocatalytic activity of Au/TiO2 rises rapidly at first and then remains constant at 75% when the O2 content is above 50%. Compared with the discharge gas of 10% and 30% O2/Ar, the sample activated by 50% O2/Ar plasma possesses less metallic Au and more surface oxygen species and carbonate species by X-ray photoelectron spectroscopy, which is consistent with UV-vis diffuse reflectance spectra and CO chemisorption. The CO chemisorption capacities of the activated samples are the same at a long exposure time due to the approximate Au nanoparticle size observed by transmission electron microscopy. An increase in carbonate species generated from the oxygen species on the surface of TiO2 is discovered.

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Evidence for a carbonate species during CO oxidation on Deactivated Rh(111)*1

Journal of Catalysis ◽

10.1016/0021-9517(91)90299-j ◽

1991 ◽

Vol 128 (2) ◽

pp. 405-414 ◽

Cited By ~ 9

Author(s):

C PEDEN

Keyword(s):

Co Oxidation ◽

Carbonate Species

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AFM study of the dynamics of α-alumina surface faceting during high-temperature processing

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013804x ◽

1995 ◽

Vol 53 ◽

pp. 334-335 ◽

Cited By ~ 1

Author(s):

Michael W. Bench ◽

Jason R. Heffelfinger ◽

C. Barry Carter

Keyword(s):

High Temperature ◽

Thin Foil ◽

Sem Analysis ◽

Conductive Coatings ◽

Force Microscopy ◽

Minimal Sample ◽

Atomic Force ◽

Formation And Evolution ◽

High Temperature Processing ◽

Nominal Surface

To gain a better understanding of the surface faceting that occurs in α-alumina during high temperature processing, atomic force microscopy (AFM) studies have been performed to follow the formation and evolution of the facets. AFM was chosen because it allows for analysis of topographical details down to the atomic level with minimal sample preparation. This is in contrast to SEM analysis, which typically requires the application of conductive coatings that can alter the surface between subsequent heat treatments. Similar experiments have been performed in the TEM; however, due to thin foil and hole edge effects the results may not be representative of the behavior of bulk surfaces.The AFM studies were performed on a Digital Instruments Nanoscope III using microfabricated Si3N4 cantilevers. All images were recorded in air with a nominal applied force of 10-15 nN. The alumina samples were prepared from pre-polished single crystals with (0001), , and nominal surface orientations.

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