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Your search keyword '"Yong Wang"' showing total 9 results
Start Over Author "Yong Wang" Publication Year Range Last 10 years Journal science Publisher american association for the advancement of science
9 results on '"Yong Wang"'

3. The oscillating Fischer-Tropsch reaction.

Author

Rui Zhang, Yong Wang, Gaspard, Pierre, and Kruse, Norbert

Subjects
*OSCILLATING chemical reactions, *CARBON monoxide, *ATMOSPHERIC pressure, *PARTIAL pressure, *CERIUM, *OSCILLATIONS
Abstract

The mechanistic steps that underlie the formation of higher hydrocarbons in catalytic carbon monoxide (CO) hydrogenation at atmospheric pressure over cobalt-based catalysts (Fischer-Tropsch synthesis) have remained poorly understood. We reveal nonisothermal rate-and-selectivity oscillations that are self-sustained over extended periods of time (’24 hours) for a cobalt/cerium oxide catalyst with an atomic ratio of cobalt to cerium of 2:1 (Co2Ce1) at 220°C and equal partial pressures of the reactants. A microkinetic mechanism was used to generate rate-and-selectivity oscillations through forced temperature oscillations. Experimental and theoretical oscillations were in good agreement over an extended range of reactant pressure ratios. Additionally, phase portraits for hydrocarbon production were constructed that support the thermokinetic origin of our rate-and-selectivity oscillations. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Activation of surface lattice oxygen in single-atom Pt/CeO2 for low-temperature CO oxidation.

Author

Lei Nie, Donghai Mei, Haifeng Xiong, Bo Peng, Zhibo Ren, Pereira Hernandez, Xavier Isidro, DeLaRiva, Andrew, Meng Wang, Engelhard, Mark H., Kovarik, Libor, DatyeDepartment of Chemical and Biological Engineering andCenter for Micro-Engineered Materials, University of NewMexico, Albuquerque, NM 87131, USA.†Corresponding author. Email: datye@unm.edu, Abhaya K., and Yong Wang

Published
2017
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9. Thermally stable single-atom platinum-on-ceria catalysts via atom trapping.

Author

Jones, John, Haifeng Xiong, DeLaRiva, Andrew T., Peterson, Eric J., Hien Pham, Challa, Sivakumar R., Gongshin Qi, Se Oh, Wiebenga, Michelle H., Pereira Hernández, Xavier Isidro, Yong Wang, and Datye, Abhaya K.

Subjects
*PLATINUM catalysts, *ALUMINUM catalysts, *ATOM trapping, *CATALYSIS, *MOLECULE trapping
Abstract

Catalysts based on single atoms of scarce precious metals can lead to more efficient use through enhanced reactivity and selectivity. However, single atoms on catalyst supports can be mobile and aggregate into nanoparticles when heated at elevated temperatures. High temperatures are detrimental to catalyst performance unless these mobile atoms can be trapped. We used ceria powders having similar surface areas but different exposed surface facets. When mixed with a platinum/aluminum oxide catalyst and aged in air at 800°C, the platinum transferred to the ceria and was trapped. Polyhedral ceria and nanorods were more effective than ceria cubes at anchoring the platinum. Performing synthesis at high temperatures ensures that only the most stable binding sites are occupied, yielding a sinter-resistant, atomically dispersed catalyst. [ABSTRACT FROM AUTHOR]

Published
2016
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