Electrocatalysis with Atomically Defined Model Systems: Metal–Support Interactions between Pt Nanoparticles and Co3O4(111) under Ultrahigh Vacuum and in Liquid Electrolytes

2018 ◽  
Vol 122 (36) ◽  
pp. 20787-20799 ◽  
Author(s):  
Firas Faisal ◽  
Manon Bertram ◽  
Corinna Stumm ◽  
Tobias Wähler ◽  
Ralf Schuster ◽  
...  
Keyword(s):  
Ultrahigh Vacuum ◽  
Pt Nanoparticles ◽  
Model Systems ◽  
Liquid Electrolytes ◽  
Metal Support ◽  
Metal Support Interactions

scholarly journals Cobalt-Based Fischer–Tropsch Synthesis: A Kinetic Evaluation of Metal–Support Interactions Using an Inverse Model System

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 794 ◽  
Author(s):  
Anna P. Petersen ◽  
Michael Claeys ◽  
Patricia J. Kooyman ◽  
Eric van Steen
Keyword(s):  
Acid Sites ◽  
Model System ◽  
Inverse Model ◽  
Model Systems ◽  
Strong Increase ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Co Dissociation ◽  
Metal Support ◽  
Metal Support Interactions

Metal–support interactions in the cobalt–alumina system are evaluated using an inverse model system generated by impregnating Co3O4 with a solution of aluminum sec-butoxide in n-hexane. This results in the formation of nano-sized alumina islands on the surface of cobalt oxide. The activated model systems were kinetically evaluated for their activity and selectivity in the Fischer–Tropsch synthesis under industrially relevant conditions (220 °C, 20 bar). The kinetic measurements were complemented by H2-chemisorption, CO-TPR, and pyridine TPD. It is shown that the introduction of aluminum in the model system results in the formation of strong acid sites and enhanced CO dissociation, as evidenced in the CO-TPR. The incorporation of aluminum in the model systems led to a strong increase in the activity factor per surface atom of cobalt in the rate expression proposed by Botes et al. (2009). However, the addition of aluminum also resulted in a strong increase in the kinetic inhibition factor. This is accompanied by a strong decrease in the methane selectivity, and an increase in the desired C5+ selectivity. The observed activity and selectivity changes are attributed to the increase in the coverage of the surface with carbon with increasing aluminum content, due to the facilitation of CO dissociation in the presence of Lewis acid sites associated with the alumina islands on the catalytically active material.

Atomically-defined model catalysts in ultrahigh vacuum and in liquid electrolytes: particle size-dependent CO adsorption on Pt nanoparticles on ordered Co3O4(111) films

2018 ◽  
Vol 20 (36) ◽  
pp. 23702-23716 ◽  
Author(s):  
Firas Faisal ◽  
Corinna Stumm ◽  
Manon Bertram ◽  
Tobias Wähler ◽  
Ralf Schuster ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
Co Adsorption ◽  
Ultrahigh Vacuum ◽  
Pt Nanoparticles ◽  
Model Catalysts ◽  
Particle Size Effects ◽  
Size Dependent ◽  
Liquid Electrolytes

We have studied particle size effects on atomically-defined model catalysts both in ultrahigh vacuum (UHV) and under electrochemical (EC) conditions in liquid electrolytes.

Electronic Metal–Support Interactions at the Catalytic Interfaces of CuO Nanowires Decorated with Pt Nanoparticles for Methanol Oxidation and CO Sensing

2020 ◽  
Vol 3 (8) ◽  
pp. 8257-8267
Author(s):  
Zakaria Ziadi ◽  
Alexander J. Porkovich ◽  
Pawan Kumar ◽  
Abheek Datta ◽  
Eric Danielson ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Pt Nanoparticles ◽  
Cuo Nanowires ◽  
Metal Support ◽  
Metal Support Interactions ◽  
Catalytic Interfaces

Effects of Particle Size on Strong Metal–Support Interactions Using Colloidal “Surfactant-Free” Pt Nanoparticles Supported on Fe3O4

ACS Catalysis ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 4136-4150 ◽  
Author(s):  
Sarah Neumann ◽  
Hans Hannes Doebler ◽  
Simona Keil ◽  
Alexandra J. Erdt ◽  
Christian Gutsche ◽  
...  
Keyword(s):  
Particle Size ◽  
Pt Nanoparticles ◽  
Metal Support ◽  
Metal Support Interactions

Electronic Metal–Support Interactions between Pt Nanoparticles and Co(OH)2 Flakes for CO Oxidation

2019 ◽  
Vol 123 (17) ◽  
pp. 10907-10916 ◽  
Author(s):  
Xueyang Song ◽  
Li Huang ◽  
Wenxue He ◽  
Chengyong Liu ◽  
Fengchun Hu ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Metal Support ◽  
Metal Support Interactions

scholarly journals A Case of Strong Metal-Support Interactions: Combining Advanced Microscopy and Model Systems to Elucidate the Atomic Structure of Interfaces

2014 ◽  
Vol 53 (23) ◽  
pp. 5998-6001 ◽  
Author(s):  
Marc G. Willinger ◽  
Wei Zhang ◽  
Oleksandr Bondarchuk ◽  
Shamil Shaikhutdinov ◽  
Hans-Joachim Freund ◽  
...  
Keyword(s):  
Atomic Structure ◽  
Model Systems ◽  
Metal Support ◽  
Metal Support Interactions

Changes induced by transition metal oxides in Pt nanoparticles unveil the effects of electronic properties on oxygen reduction activity

2019 ◽  
Vol 7 (5) ◽  
pp. 2075-2086 ◽  
Author(s):  
Felipe B. Ometto ◽  
Emilia A. Carbonio ◽  
Érico Teixeira-Neto ◽  
Hebe M. Villullas
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Electronic Properties ◽  
Oxygen Reduction ◽  
Transition Metal Oxides ◽  
Pt Nanoparticles ◽  
Electronic Effects ◽  
Reduction Activity ◽  
Metal Support ◽  
Metal Support Interactions

Relevance of electronic effects in oxygen reduction on Pt nanoparticles is unveiled taking advantage of metal–support interactions.

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