Role of hydrogen in the mobility of phases in Ni-TiO sub x systems

Journal Article · Sun Sep 01 00:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90322-U· OSTI ID:5639021

Gonzalez-Elipe, A R; Fernandez, A; Espinos, J P; Munuera, G ^[1]

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1. Univ. of Sevilla (Spain)

The role of hydrogen in the mobility of Ni and titanium suboxide phases in Ni-TiO{sub x} systems has been investigated by means of XPS and ISS. Two different systems have been examined, a composite Ni-TiO{sub x} material formed by large Ni particles (ca. 35 nm) embedded in a nonstoichiometric titanium oxide matrix and a Ni foil with evaporated TiO{sub x} species. heating at 773 K leads to diffusion of the TiO{sub x} species into the Ni foil, a process which is strongly enhanced in the presence of H{sub 2}. In a similar way, heating the Ni-TiO{sub x} composite in H{sub 2} at the same temperature results in a redistribution of the Ni atoms through the defective titanium oxide lattice. This hydrogen-enhanced diffusion of the TiO{sub x} and Ni species is discussed in relation to the SMSI state and other related phenomena occurring during the activation in H{sub 2} of Ni/TiO{sub 2} catalysts.

• OSTI ID: 5639021
• Journal Information: Journal of Catalysis; (United States), Vol. 131:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
PHASE STUDIES
NICKEL
TITANIUM OXIDES
CATALYST SUPPORTS
COMPOSITE MATERIALS
CONFIGURATION INTERACTION
CRYSTAL LATTICES
DIFFUSION
DISTRIBUTION
HYDROGEN
ION SCATTERING ANALYSIS
PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
ELEMENTS
MATERIALS
METALS
NONDESTRUCTIVE ANALYSIS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360602* - Other Materials- Structure & Phase Studies