Structure of Catalytically Active Sites in Supported Metal Catalysts

2007 ◽  
Author(s):  
Jeroen A. van Bokhoven ◽  
Eveline Bus ◽  
Dave E. Ramaker
Keyword(s):  
Active Sites ◽  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Catalytically Active ◽  
Supported Metal

Catalytically Active and Spectator Ce3+in Ceria-Supported Metal Catalysts

2015 ◽  
Vol 54 (30) ◽  
pp. 8728-8731 ◽  
Author(s):  
René Kopelent ◽  
Jeroen A. van Bokhoven ◽  
Jakub Szlachetko ◽  
Jacinta Edebeli ◽  
Cristina Paun ◽  
...  
Keyword(s):  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Catalytically Active ◽  
Supported Metal

scholarly journals Boosting selective hydrogenation through hydrogen spillover on supported-metal catalysts at room temperature

2021 ◽  
Author(s):  
Sai Zhang ◽  
Zhaoming Xia ◽  
Mingkai Zhang ◽  
Yong Zou ◽  
Xiao Chen ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Active Sites ◽  
Room Temperature ◽  
Metal Catalysts ◽  
Hydrogen Spillover ◽  
Binding Energies ◽  
Supported Metal Catalysts ◽  
High Turnover ◽  
Scaling Relationship ◽  
Supported Metal

Highly efficient hydrogenation of unsaturated substrates with strong absorption on metals at low temperatures is a long-term pursuit. However, due to the scaling relationship of high binding energies on metals, the poor activity and/or selectivity are frequently observed. Herein, we described a strategy of hydrogen spillover to break this scaling relationship to enable highly performed hydrogenation at low temperatures by constructing the dual-active site in supported-metal catalysts. Hydrogen and reactants are selectively activated on metal and the second active sites on support, respectively. Hydrogenation sequentially occurs on the second active sites via hydrogen spillover from metal to support. Easy desorption of surface-bounded products substantially re-generates the active sites. Guided by this design, for cinnamaldehyde hydrogenation, PtCo alloys (for H2 dissociation) supported on hydroxyl-abundant CoBOx (for aldehyde activation) delivered a high turnover frequency of 2479 h-1 (two orders of magnitude over PtCo/C) and 94.5% selectivity of cinnamyl alcohol at room temperature.

scholarly journals A Theory-guided X-ray Absorption Spectroscopy Approach for Identifying Active Sites in Atomically Dispersed Transition Metal Catalysts

2021 ◽  
Author(s):  
Yizhen Chen ◽  
Rachita Rana ◽  
Tyler Sours ◽  
FERNANDO D. VILA ◽  
Shaohong Cao ◽  
...  
Keyword(s):  
Active Sites ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Exafs Analysis ◽  
Catalytically Active ◽  
Metal Support ◽  
Resolution Imaging

Atomically dispersed supported metal catalysts offer new properties and the benefits of maximized metal accessibility and utilization. The characterization of these materials, however, remains challenging. Using atomically-dispersed Pt supported on crystalline MgO (chosen for its well-defined bonding sites for Pt) as a prototypical example, in this work, we demonstrate how systematic density functional theory calculations (for assessing all the potentially stable Pt sites) combined with automated EXAFS analysis can lead to unbiased identification of isolated, surface-enveloped platinum cations as the catalytic species for CO oxidation. The catalyst has been characterized by atomic-resolution imaging, EXAFS, and HERFD-XANES spectroscopies; the proposed Pt site are in full agreement with experiment. This theory-guided workflow leads to rigorously determined structural models and provides a more detailed picture of the structure of the catalytically active sites than what is currently possible with conventional EXAFS analysis. As this approach is efficient and agnostic to the metal, support, and catalytic reaction, we posit that it will be of broad interest to the materials characterization and catalysis communities.

Hydrodeoxygenation of lignin-derived phenolics – a review on the active sites of supported metal catalysts

2020 ◽  
Vol 22 (23) ◽  
pp. 8140-8168
Author(s):  
Xinchao Wang ◽  
Masahiko Arai ◽  
Qifan Wu ◽  
Chao Zhang ◽  
Fengyu Zhao
Keyword(s):  
Phenolic Compounds ◽  
Active Sites ◽  
State Of The Art ◽  
Metal Catalysts ◽  
The State ◽  
Supported Metal Catalysts ◽  
Supported Metal

This article mainly reviews the state-of-the-art achievements of supported metal catalysts and the characteristics and actions of their active sites, working in the reactions involved in HDO of lignin-derived phenolic compounds.

scholarly journals Identification of active sites on supported metal catalysts with carbon nanotube hydrogen highways

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Nicholas M. Briggs ◽  
Lawrence Barrett ◽  
Evan C. Wegener ◽  
Leidy V. Herrera ◽  
Laura A. Gomez ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Active Sites ◽  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Supported Metal

Catalytically Active and Spectator Ce3+in Ceria-Supported Metal Catalysts

2015 ◽  
Vol 127 (30) ◽  
pp. 8852-8855 ◽  
Author(s):  
René Kopelent ◽  
Jeroen A. van Bokhoven ◽  
Jakub Szlachetko ◽  
Jacinta Edebeli ◽  
Cristina Paun ◽  
...  
Keyword(s):  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Catalytically Active ◽  
Supported Metal
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