Journal ArticleDOI
Infrared study of carbon monoxide hydrogenation over rhodium/ceria and rhodium/silica catalysts
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TLDR
In this article, a new absorption band was observed near 1,725 or 1,696 cm{sup {minus}1} on a reduced 5% Rh-5% CeO-sub 2/SiO{sub 2} or 5% RH/CeO{ sub 2} catalyst, respectively.Abstract:
Carbon monoxide hydrogenation over ceria-promoted Rh or Rh/SiO{sub 2} catalysts was investigated by means of Fourier transform infrared spectroscopy. In the chemisorption of CO at room temperature, a new absorption band was observed near 1,725 or 1,696 cm{sup {minus}1} on a reduced 5% Rh-5% CeO{sub 2}/SiO{sub 2} or 5% Rh/CeO{sub 2} catalyst, respectively. This new absorption band was attributed to a C- and O-bonded species, located at the metal/support interface. The appearance of this species was related to the shift to lower temperatures of the peak ascribed to CO dissociation in the temperature-programmed desorption spectra after CO adsorption. A flow high-pressure IR cell allowed to study the surface species in situ during CO + H{sub 2} reaction and to follow the reactivity of these species toward pure H{sub 2}. The results suggest that the drop in methane formation may be related to a lower reactivity of surface carbon in the presence of the promoter.read more
Citations
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Journal ArticleDOI
Catalytic Properties of Ceria and CeO2-Containing Materials
TL;DR: A survey of the use of cerium oxide and CeO2-containing materials as oxidation and reduction catalysts is presented in this paper, with a special focus on catalytic interaction with small molecules such as hydrogen, carbon monoxide, oxygen, and nitric oxide.
Book ChapterDOI
Characterization of oxide surfaces and zeolites by carbon monoxide as an IR probe molecule
TL;DR: In this article, a review of the data characterizing CO adsorption on surface cationic sites of oxides including supported materials and microporous and mesoporous materials is presented.
Journal ArticleDOI
Some recent results on metal/support interaction effects in NM/CeO2 (NM: noble metal) catalysts
S. Bernal,José J. Calvino,Miguel A. Cauqui,José M. Gatica,C. Larese,J.A. Pérez Omil,José M. Pintado +6 more
TL;DR: In this article, a proposal is made about the nature of the metal/support interaction phenomena occurring in ceria-supported noble metal (NM/CeO2) catalysts as the reduction temperature is increased.
Journal ArticleDOI
Mechanistic Aspects of the Formation of Hydrocarbons and Alcohols from CO Hydrogenation
TL;DR: In this article, it is shown that the world reserves of coal and natural gas far exceed those of oil, and this fact alone implies that the conversion of coal to transportation fuels is almost certain to become more widespread within the next 20 years.
Journal ArticleDOI
CO2 hydrogenation at low temperature over Rh/gamma-Al2O3 catalysts: effect of the metal particle size on catalytic performances and reaction mechanism
TL;DR: In this paper, low temperature CO2 methanation was studied on Rh/γ-Al2O3 catalysts, and the intrinsic activity of these catalysts in CO2 hydrogenation to methane was found to do not depend on particle size at temperatures between 185 and 200 °C.
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