Active yet extremely durable Co3O4 spheroids of different texture without/with Au deposition for CO oxidation

2015 ◽  
Vol 5 (2) ◽  
pp. 1065-1075 ◽  
Author(s):  
Y. Yao ◽  
Q. Su ◽  
X. Z. Feng ◽  
B. Sun ◽  
W. J. Ji ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Oxidation Activity ◽  
Highly Active ◽  
Shell Type

Co3O4 spheroids of different texture without/with Au deposition were highly active yet very durable at 60–90 °C for CO oxidation. The calcined Co3O4-based catalysts and the yolk–shell type one were even more durable. The catalysts encountered obvious enhancement in CO oxidation activity via in situ pretreatment.

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.

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.

In Situ XRD, XPS, TEM, and TPR Study of Highly Active in CO Oxidation CuO Nanopowders

2013 ◽  
Vol 117 (28) ◽  
pp. 14588-14599 ◽  
Author(s):  
Dmitry A. Svintsitskiy ◽  
Tatyana Yu. Kardash ◽  
Olga A. Stonkus ◽  
Elena M. Slavinskaya ◽  
Andrey I. Stadnichenko ◽  
...  
Keyword(s):  
Co Oxidation ◽  
In Situ Xrd ◽  
Highly Active ◽  
Cuo Nanopowders

In situ spectroscopic investigation of a Pd local structure over Pd/CeO2 and Pd/MnOx–CeO2 during CO oxidation

2017 ◽  
Vol 5 (25) ◽  
pp. 12998-13008 ◽  
Author(s):  
Erdem Sasmaz ◽  
Chao Wang ◽  
Michael J. Lance ◽  
Jochen Lauterbach
Keyword(s):  
Fourier Transform ◽  
Co Oxidation ◽  
Local Structure ◽  
Diffuse Reflectance ◽  
Oxidation Activity ◽  
X Ray ◽  
Low Temperature Co Oxidation ◽  
Diffuse Reflectance Infrared ◽  
X Ray Absorption

In situ X-ray absorption fine structure (XAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments were performed to elucidate the effect of the Pd local structure on low temperature CO oxidation activity of Pd/CeO2 and Pd/MnOx–CeO2.

In Situ Phase Separation of NiAu Alloy Nanoparticles for Preparing Highly Active Au/NiO CO Oxidation Catalysts

ChemPhysChem ◽  
2008 ◽  
Vol 9 (17) ◽  
pp. 2475-2479 ◽  
Author(s):  
Shenghu Zhou ◽  
Hongfeng Yin ◽  
Viviane Schwartz ◽  
Zili Wu ◽  
David Mullins ◽  
...  
Keyword(s):  
Phase Separation ◽  
Co Oxidation ◽  
Alloy Nanoparticles ◽  
Oxidation Catalysts ◽  
Highly Active

An Au22(L8)6 nanocluster with in situ uncoordinated Au as a highly active catalyst for O2 activation and CO oxidation

2019 ◽  
Vol 21 (36) ◽  
pp. 20144-20150 ◽  
Author(s):  
Fuhua Li ◽  
Qing Tang
Keyword(s):  
Co Oxidation ◽  
Active Catalyst ◽  
O2 Activation ◽  
Highly Active

The in situ uncoordinated Au at the interface of the Au22(L8)6 nanocluster is catalytically effective for O2 activation and CO oxidation.

The solid-state in situ construction of Cu2O/CuO heterostructures with adjustable phase compositions to promote CO oxidation activity

CrystEngComm ◽  
2020 ◽  
Vol 22 (45) ◽  
pp. 7808-7815
Author(s):  
Baolin Liu ◽  
Yizhao Li ◽  
Kun Wang ◽  
Yali Cao
Keyword(s):  
Solid State ◽  
Co Oxidation ◽  
Oxidation Activity ◽  
Catalytic Activities ◽  
State Technology

Cu2O/CuO heterojunctions were fabricated via in situ solid-state technology. Tuning the ratio of reactants enables optimization of the components of the Cu2O/CuO heterostructures and their catalytic activities for CO oxidation.

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
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