Journal ArticleDOI
Infrared spectra of chemisorbed CO on Rh
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TLDR
In this paper, the infrared spectrum of CO chemisorbed on alumina-supported Rh atoms has been investigated, and three types of adsorbed species have been clearly distinguished on the basis of their C-O stretching frequencies.Abstract:
The infrared spectrum of CO chemisorbed on alumina‐supported Rh atoms has been investigated. In agreement with previous work, three types of adsorbed species have been clearly distinguished on the basis of their C–O stretching frequencies. Species I, assigned as Rh(CO)2, is formed only with Rh atoms which are isolated from each other. Species II, assigned as Rh–CO, and III, assigned as Rh2CO, are formed on Rh clusters having two or more Rh atoms. CO‐species II and III undergo interactions with neighbor CO species causing an increase in wave number as coverage increases. Based on infrared intensity measurements for species I, the OC–Rh–CO angle is ∼90°. Chemisorbed 13CO yields the expected infrared spectrum on Rh, and rapid isotopic exchange between 13CO(ads) and 12CO(g) is observed which cannot be explained by the observed rate of desorption of CO from the supported Rh surface.read more
Citations
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Journal ArticleDOI
Identification of active sites in CO oxidation and water-gas shift over supported Pt catalysts
Kunlun Ding,Ahmet Gulec,Alexis M. Johnson,Neil M. Schweitzer,Galen D. Stucky,Laurence D. Marks,Peter C. Stair,Peter C. Stair +7 more
TL;DR: It is demonstrated that infrared spectroscopy can be a fast and convenient characterization method with which to directly distinguish and quantify Pt single atoms from nanoparticles, and directly observe that only Pt nanoparticles show activity for carbon monoxide (CO) oxidation and water-gas shift at low temperatures, whereas Ptsingle atoms behave as spectators.
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Single-Atom Catalysts across the Periodic Table.
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Isolated Metal Active Site Concentration and Stability Control Catalytic CO2 Reduction Selectivity
TL;DR: This work demonstrates that isolated atoms and nanoparticles of the same metal on the same support can exhibit uniquely different catalytic selectivity in competing parallel reaction pathways and that disintegration of nanoparticles under reaction conditions can play a significant role in controlling stability.
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Spectroscopic and theoretical investigations of vibrational frequencies in binary unsaturated transition-metal carbonyl cations, neutrals, and anions.
TL;DR: The laser-ablation method produces mostly neutral atoms with a few percent cations and electrons for capture to make anions; in contrast, thermal evaporation gives only neutral species, so the very recent neon matrix investigations in the laboratory provide carbonyl cation and anions for comparison to neutrals on a level playing field.
Journal ArticleDOI
Single-Atom Catalysts Based on the Metal-Oxide Interaction.
Rui Lang,Rui Lang,Xiaorui Du,Yike Huang,Yike Huang,Xunzhu Jiang,Xunzhu Jiang,Qian Zhang,Qian Zhang,Yalin Guo,Yalin Guo,Liu Kaipeng,Liu Kaipeng,Botao Qiao,Aiqin Wang,Tao Zhang +15 more
TL;DR: In this review, oxide supported single-atom catalysts are discussed about their synthetic procedures, characterizations, and reaction mechanism in thermocatalysis, such as water-gas shift reaction, selective oxidation/hydrogenation, and coupling reactions.
References
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Journal ArticleDOI
The chemisorption of carbon monoxide on palladium single crystal surfaces: IR spectroscopic evidence for localised site adsorption
TL;DR: In this article, combined IR reflection-absorption and LEED studies of the room temperature adsorption of carbon monoxide on the (100), (111) and (210) surfaces of palladium are reported.
Journal ArticleDOI
Infrared Studies of Carbon Monoxide Chemisorbed on Rhodium
Andrew C. Yang,Carl W. Garland +1 more
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