Critical Influence of Redox Pretreatments on the CO Oxidation Activity of BaFeO3−δ Perovskites: An in-Depth Atomic-Scale Analysis by Aberration-Corrected and in Situ Diffraction Techniques

ACS Catalysis ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 8653-8663 ◽  
Author(s):  
Achraf el Hadri ◽  
Isabel Gómez-Recio ◽  
Eloy del Río ◽  
Juan C. Hernández-Garrido ◽  
Raquel Cortés-Gil ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Atomic Scale ◽  
Scale Analysis ◽  
Oxidation Activity ◽  
In Situ Diffraction ◽  
Aberration Corrected

scholarly journals In situ manipulation of the active Au-TiO2 interface with atomic precision during CO oxidation

Science ◽  
2021 ◽  
Vol 371 (6528) ◽  
pp. 517-521 ◽  
Author(s):  
Wentao Yuan ◽  
Beien Zhu ◽  
Ke Fang ◽  
Xiao-Yan Li ◽  
Thomas W. Hansen ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Critical Role ◽  
Operating Conditions ◽  
Catalytic Reactions ◽  
Atomic Scale ◽  
Metal Catalyst ◽  
Transmission Electron ◽  
Atomic Precision ◽  
Aberration Corrected

The interface between metal catalyst and support plays a critical role in heterogeneous catalysis. An epitaxial interface is generally considered to be rigid, and tuning its intrinsic microstructure with atomic precision during catalytic reactions is challenging. Using aberration-corrected environmental transmission electron microscopy, we studied the interface between gold (Au) and a titanium dioxide (TiO2) support. Direct atomic-scale observations showed an unexpected dependence of the atomic structure of the Au-TiO2 interface with the epitaxial rotation of gold nanoparticles on a TiO2 surface during carbon monoxide (CO) oxidation. Taking advantage of the reversible and controllable rotation, we achieved in situ manipulation of the active Au-TiO2 interface by changing gas and temperature. This result suggests that real-time design of the catalytic interface in operating conditions may be possible.

In situ atomic-scale analysis of Rayleigh instability in ultrathin gold nanowires

Nano Research ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 625-632 ◽  
Author(s):  
Shang Xu ◽  
Peifeng Li ◽  
Yang Lu
Keyword(s):  
Atomic Scale ◽  
Gold Nanowires ◽  
Scale Analysis ◽  
Rayleigh Instability

Atomic-scale imaging of the defect dynamics in ceria nanowires under heating by in situ aberration-corrected TEM

2019 ◽  
Vol 62 (12) ◽  
pp. 1704-1709 ◽  
Author(s):  
Xiaomin Li ◽  
Kaihui Liu ◽  
Wenlong Wang ◽  
Xuedong Bai
Keyword(s):  
Atomic Scale ◽  
Aberration Corrected

scholarly journals Atomic-Scale Analysis of Chemical Bonding of Delaminated Graphene at Faceted SiC by Aberration-Corrected Scanning Transmission Electron Microscopy

2013 ◽  
Vol 19 (S2) ◽  
pp. 1238-1239
Author(s):  
G. Nicotra ◽  
Q.M. Ramasse ◽  
I. Deretzis ◽  
C. Bongiorno ◽  
C. Spinella ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Chemical Bonding ◽  
Scanning Transmission Electron Microscopy ◽  
Atomic Scale ◽  
Scale Analysis ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Aberration Corrected

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

scholarly journals Catalytic Behaviour of Flame-Made CuO-CeO2 Nanocatalysts in Efficient CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 256 ◽  
Author(s):  
Feng Zhao ◽  
Shuangde Li ◽  
Xiaofeng Wu ◽  
Renliang Yue ◽  
Weiman Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Water Vapor ◽  
Co Oxidation ◽  
Photoelectron Spectroscopy ◽  
Co Adsorption ◽  
Synergistic Interaction ◽  
Flame Spray ◽  
Oxidation Activity ◽  
X Ray

CuO-CeO2 nanocatalysts with varying CuO contents (1, 5, 9, 14 and 17 wt %) were prepared by one-step flame spray pyrolysis (FSP) and applied to CO oxidation. The influences of CuO content on the as-prepared catalysts were systematically characterized by X-ray diffraction (XRD), N2 adsorption-desorption at −196 °C, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and hydrogen-temperature programmed reduction (H2-TPR). A superior CO oxidation activity was observed for the 14 wt % CuO-CeO2 catalyst, with 90% CO conversion at 98 °C at space velocity (60,000 mL × g−1 × h−1), which was attributed to abundant surface defects (lattice distortion, Ce3+, and oxygen vacancies) and high reducibility supported by strong synergistic interaction. In addition, the catalyst also displayed excellent stability and resistance to water vapor. Significantly, in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) showed that in the CO catalytic oxidation process, the strong synergistic interaction led readily to dehydroxylation and CO adsorption on Cu+ at low temperature. Furthermore, in the feed of water vapor, although there was an adverse effect on the access of CO adsorption, there was also a positive effect on the formation of fewer carbon intermediates. All these results showed the potential of highly active and water vapor-resistive CuO-CeO2 catalysts prepared by FSP.

scholarly journals Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure

2016 ◽  
Vol 18 (44) ◽  
pp. 30622-30629 ◽  
Author(s):  
L. S. R. Kumara ◽  
Osami Sakata ◽  
Shinji Kohara ◽  
Anli Yang ◽  
Chulho Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Scale Structure ◽  
Atomic Scale ◽  
Face Centered Cubic ◽  
Ruthenium Nanoparticles ◽  
Oxidation Activity ◽  
Atomic Scale Structure ◽  
Face Centered

The 3D configuration models of novel fcc and conventional hcp ruthenium nanoparticles are studied to elucidate their CO oxidation activity.

An In Situ Dealloying and Oxidation Route to Co3O4 Nanosheets and their Ambient-Temperature CO Oxidation Activity

ChemCatChem ◽  
2011 ◽  
Vol 3 (2) ◽  
pp. 399-407 ◽  
Author(s):  
Caixia Xu ◽  
Yunqing Liu ◽  
Ce Zhou ◽  
Lin Wang ◽  
Haoran Geng ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Co Oxidation ◽  
Oxidation Activity

CO oxidation activity of Pt, Zn and ZnPt nanocatalysts: a comparative study by in situ near-ambient pressure X-ray photoelectron spectroscopy

Nanoscale ◽  
2018 ◽  
Vol 10 (14) ◽  
pp. 6566-6580 ◽  
Author(s):  
Ahmed Naitabdi ◽  
Anthony Boucly ◽  
François Rochet ◽  
Robert Fagiewicz ◽  
Giorgia Olivieri ◽  
...  
Keyword(s):  
Comparative Study ◽  
Co Oxidation ◽  
Chemical Reactions ◽  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Oxidation Activity ◽  
X Ray

NAP-XPS allows the monitoring of chemical reactions on nanocatalysts.

Atomic-Scale Imaging and Spectroscopy for In Situ Liquid Scanning Transmission Electron Microscopy

2012 ◽  
Vol 18 (3) ◽  
pp. 621-627 ◽  
Author(s):  
Katherine L. Jungjohann ◽  
James E. Evans ◽  
Jeffery A. Aguiar ◽  
Ilke Arslan ◽  
Nigel D. Browning
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Path Length ◽  
Atomic Scale ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Aberration Corrected

AbstractObservation of growth, synthesis, dynamics, and electrochemical reactions in the liquid state is an important yet largely unstudied aspect of nanotechnology. The only techniques that can potentially provide the insights necessary to advance our understanding of these mechanisms is simultaneous atomic-scale imaging and quantitative chemical analysis (through spectroscopy) under environmental conditions in the transmission electron microscope. In this study we describe the experimental and technical conditions necessary to obtain electron energy loss (EEL) spectra from a nanoparticle in colloidal suspension using aberration-corrected scanning transmission electron microscopy (STEM) combined with the environmental liquid stage. At a fluid path length below 400 nm, atomic resolution images can be obtained and simultaneous compositional analysis can be achieved. We show that EEL spectroscopy can be used to quantify the total fluid path length around the nanoparticle and demonstrate that characteristic core-loss signals from the suspended nanoparticles can be resolved and analyzed to provide information on the local interfacial chemistry with the surrounding environment. The combined approach using aberration-corrected STEM and EEL spectra with the in situ fluid stage demonstrates a plenary platform for detailed investigations of solution-based catalysis.

scholarly journals Atomic-scale Analysis of Mechanical Response of SrTiO3 by MEMS-based in Situ STEM Mechanical Testing

2020 ◽  
Vol 26 (S2) ◽  
pp. 1838-1840
Author(s):  
Eita Tochigi ◽  
Takaaki Sato ◽  
Naoya Shibata ◽  
Hiroyuki Fujita ◽  
Yuichi Ikuhara
Keyword(s):  
Mechanical Testing ◽  
Mechanical Response ◽  
Atomic Scale ◽  
Scale Analysis
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