Infrared spectroscopy adsorbed hydrogen

Kunimatsu, K. and Bewick, A. (1986) Electrochemically modulated infrared spectroscopy of adsorbed water in the inner part of the double layer part 1. Oxygen-hydrogen stretching spectra of water on gold in 1M perchloric acid. fnd. J. Technol., 24, 407-412. 

As Smith (300) has shown by infrared spectroscopy, carboxylic acids are adsorbed either by hydrogen bonding of the carboxyl group or by proton transfer to the surface. Carboxylate absorptions were observed in the spectra. Very likely O " or OH ions acted as proton acceptors although no OH absorption bands could be detected after carboxylic acid adsorption. The isoelectric point of pure anatase is near pH 6.6 (305). 

Infrared Spectroscopy. Infrared (1R) spectroscopy is also used for understanding the structure of the bimetallic nanoparticles. Carbon monoxide can be adsorbed on the surface of metals, and the 1R spectra of the adsorbed CO depend on the kind of metal. These properties are used for analyzing the surface structure of metal nanoparticles. The inverted core/shell structure, constructed by sacrificial hydrogen reduction, was probed by this technique (44). 

Chabal, Y. J. High-resolution infrared spectroscopy of adsorbates on semiconductor surfaces hydrogen on Si(100) and Ge(100). Surface Science 168, 594—608 (1986). 

The stereochemistry of acetylene hydrogenation has been examined by determining the relative yields of cis-, trans- and asym.-C2H2D2 by infrared spectroscopy [163—165]. Some typical results are shown in Table 17. C/s-C2H2D2 will result from the reaction of either adsorbed... 

R. J. Kokes, "Characterization of Adsorbed Intermediates on Zinc Oxide by Infrared Spectroscopy, Accounts of Chemical Research 6, 226 (1973). This article is rather mistitled and actually is concerned mostly with the mechanism of heterogeneous hydrogenation of alkenes,... 

Adsorbed hydrogen on metal surfaces is of particular interest from both theoretical and experimental points of view. Vibrational spectroscopy data on hydrogen adsorbed from the gas phase have been obtained from IR reflection-absorption experiments as well as from electron energy loss spectroscopy and inelastic neutron scattering techniques [39-41]. In UHV, absorption bands for the M-H bond have been reported in the mid- and far-infrared regions [41, 42],... 

TPD and infrared spectroscopy were used to study CO2 hydrogenation over Cu/ZnO/Si02 catalyst. Adsorbed CO2 was believed to form copper formate via the hydrogenation and the formate subsequently. The role of zinc oxide seemed to store more hydrogen during reaction, which promoted the hydrogenation of copper formate to methanol. 

Defects which contain or are derived from a surface impurity are an ever-present possibility in any but the most painstaking experiments. With carefully cleaned metals in ultrahigh vacuum, any defects may be presumed to arise from the metal itself, but with most samples, in the usual experimental systems the surface is surely eontaminated with residual water, atmospheric gases, or worse. Adsorbed free radicals produced from such contaminants can sometimes be seen by ESR, and groups containing hydrogen are often identifiable by infrared spectroscopy. With or without such markers, the participation of surface... 

Platinum electrodes do not give products continuously in CO2 reduction in aqueous media under 1 atm as shown in Table 3. Platinum electrodes initially reduce CO2 to reduced 002 . The entity of the reduced CO2 is CO strongly adsorbed on the Pt electrode, as revealed by Beden et al. by means of infrared spectroscopy. Tills fact is later confirmed by other workers. " In addition to linearly bonded CO as the major adsorbed species, small amounts of bridged and multibonded CO, COH and HCOO species are also detected on Pt electrode surface. The presence of reduced CO2 on Pt electrode practically inhibits further reduction of CO2 in aqueous media. The formation of reduced CO2 proceeds as below in the potential region in which adsorbed hydrogen is stably present. 

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