scholarly journals Nanosized Au Catalysts Supported on Mg(OH)<sub>2</sub>-CeO<sub>2</sub> for Preferential Oxidation of CO in Hydrogen Stream

2019 ◽  
Vol 08 (02) ◽  
pp. 11-23
Author(s):  
Yu-Wen Chen ◽  
Anton S. Brichkov ◽  
Vladmir V. Kozik
Keyword(s):  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Preferential Oxidation Of Co ◽  
Hydrogen Stream

scholarly journals Inverse single-site Fe1(OH)X/Pt(111) model catalyst for preferential oxidation of CO in H2

Nano Research ◽  
2021 ◽  
Author(s):  
Chunlei Wang ◽  
Heloise Tissot ◽  
Markus Soldemo ◽  
Junling Lu ◽  
Jonas Weissenrieder
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Redox Properties ◽  
Model Catalyst ◽  
Single Site ◽  
Oxide Nanoparticles ◽  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Reaction Conditions ◽  
Preferential Oxidation Of Co

AbstractInverse oxide/metal model systems are frequently used to investigate catalytic structure-function relationships at an atomic level. By means of a novel atomic layer deposition process, growth of single-site Fe1Ox on a Pt(111) single crystal surface was achieved, as confirmed by scanning tunneling microscopy (STM). The redox properties of the catalyst were characterized by synchrotron radiation based ambient pressure X-ray photoelectron spectroscopy (AP-XPS). After calcination treatment at 373 K in 1 mbar O2 the chemical state of the catalyst was determined as Fe3+. Reduction in 1 mbar H2 at 373 K demonstrates a facile reduction to Fe2+ and complete hydroxylation at significantly lower temperatures than what has been reported for iron oxide nanoparticles. At reaction conditions relevant for preferential oxidation of CO in H2 (PROX), the catalyst exhibits a Fe3+ state (ferric hydroxide) at 298 K while re-oxidation of iron oxide clusters does not occur under the same condition. CO oxidation proceeds on the single-site Fe1(OH)3 through a mechanism including the loss of hydroxyl groups in the temperature range of 373 to 473 K, but no reaction is observed on iron oxide clusters. The results highlight the high flexibility of the single iron atom catalyst in switching oxidation states, not observed for iron oxide nanoparticles under similar reaction conditions, which may indicate a higher intrinsic activity of such single interfacial sites than the conventional metal-oxide interfaces. In summary, our findings of the redox properties on inverse single-site iron oxide model catalyst may provide new insights into applied Fe-Pt catalysis.

scholarly journals Preferential oxidation of CO (CO-PROX) over CuOx/CeO2 coated microchannel reactor

2012 ◽  
Vol 180 (1) ◽  
pp. 105-110 ◽  
Author(s):  
O.H. Laguna ◽  
E.M. Ngassa ◽  
S. Oraá ◽  
A. Álvarez ◽  
M.I. Domínguez ◽  
...  
Keyword(s):  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Microchannel Reactor ◽  
Preferential Oxidation Of Co

Mechanochemical synthesis of CuO-CeO2 catalysts for the preferential oxidation of CO in the presence of H2

2014 ◽  
Vol 55 (6) ◽  
pp. 777-785 ◽  
Author(s):  
A. A. Firsova ◽  
O. S. Morozova ◽  
A. V. Leonov ◽  
A. N. Streletskii ◽  
V. N. Korchak
Keyword(s):  
Mechanochemical Synthesis ◽  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Preferential Oxidation Of Co
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