Co-promoted Pt catalysts supported on silica aerogel for preferential oxidation of CO

2008 ◽  
Vol 9 (5) ◽  
pp. 880-885 ◽  
Author(s):  
Jinsoon Choi ◽  
Chee Burm Shin ◽  
Dong Jin Suh
Keyword(s):  
Silica Aerogel ◽  
Pt Catalysts ◽  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Preferential Oxidation Of Co

Preferential Oxidation of CO over Pt Catalysts Supported on Mesoporous Aluminosilicates in the Presence of H2

2010 ◽  
Vol 658 ◽  
pp. 37-40
Author(s):  
Ryosuke Nakanishi ◽  
Keiichi Inukai ◽  
Masaki Maeda ◽  
Masaya Suzuki ◽  
Yutaka Tai
Keyword(s):  
Low Temperature ◽  
Polymer Electrolyte Fuel Cells ◽  
Stable Operation ◽  
Pt Catalysts ◽  
Anode Catalyst ◽  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Mesoporous Aluminosilicates ◽  
Preferential Oxidation Of Co ◽  
Increasing Temperature

. Preferential oxidation (PROX) of CO in the presence of H2 is an important reaction to maintain stable operation of polymer electrolyte fuel cells (PEFCs) since their anode catalyst can be poisoned by trace amount of CO. In this study, we examined PROX reactions mediated by Pt catalysts prepared using several mesoporous silica and aluminosilicate supports such as imogolite (IM), allophane (AP), silica aerogel (SAG), and an amorphous hydroxyl aluminosilicate developed in our research group (HAS). The selectivity of CO oxidation gradually decreased from 80 to 60 % with increasing temperature from 323 to 473 K for Pt/HAS catalyst whereas it increased with temperature from 10 to 40 % for Pt/IM, Pt/AP, Pt/SAG catalysts. These results indicate that Pt supported on HAS may be effective for low-temperature PROX reactions.

scholarly journals Developing single-site Pt catalysts for the preferential oxidation of CO: A surface science and first principles-guided approach

2021 ◽  
Vol 284 ◽  
pp. 119716
Author(s):  
Jilei Liu ◽  
Alyssa J.R. Hensley ◽  
Georgios Giannakakis ◽  
Andrew J. Therrien ◽  
Ahmad Sukkar ◽  
...  
Keyword(s):  
Surface Science ◽  
First Principles ◽  
Single Site ◽  
Pt Catalysts ◽  
Preferential Oxidation ◽  
Oxidation Of Co ◽  
Preferential Oxidation Of Co

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
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