ChemInform Abstract: Studies of Metal Support Interactions with “Real” and “Inverted” Model Systems: Reactions of CO and Small Hydrocarbons with Hydrogen on Noble Metals in Contact with Oxides

ChemInform ◽  
2000 ◽  
Vol 31 (49) ◽  
pp. no-no
Author(s):  
K. Hayek ◽  
M. Fuchs ◽  
B. Klotzer ◽  
W. Reichl ◽  
G. Rupprechter
Keyword(s):  
Noble Metals ◽  
Model Systems ◽  
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.

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

Metal−Support Interactions in Zeolite-Supported Noble Metals:  Influence of Metal Crystallites on the Support Acidity

2006 ◽  
Vol 110 (10) ◽  
pp. 4937-4946 ◽  
Author(s):  
David Kubička ◽  
Narendra Kumar ◽  
Tapani Venäläinen ◽  
Hannu Karhu ◽  
Iva Kubičková ◽  
...  
Keyword(s):  
Noble Metals ◽  
Metal Support ◽  
Supported Noble Metals ◽  
Metal Support Interactions

Growth kinetic control over MgFe2O4 to tune Fe occupancy and metal–support interactions for optimum catalytic performance

CrystEngComm ◽  
2021 ◽  
Vol 23 (13) ◽  
pp. 2538-2546
Author(s):  
Min Yang ◽  
Guangshe Li ◽  
Huixia Li ◽  
Junfang Ding ◽  
Yan Wang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Growth Kinetic ◽  
Catalytic Performance ◽  
Growth Behavior ◽  
Kinetic Control ◽  
Size Dependent ◽  
Metal Support ◽  
Support Size ◽  
Metal Support Interactions ◽  
First Time

For the first time, the growth behavior with size-dependent Fe occupancies at different sites of MgFe2O4 was examined. Hybrid catalysts of Pt/MgFe2O4 with a support size of 20.6 nm exhibited an optimal performance of CO oxidation.

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