Adsorbate ordering effects in the trimerization reaction of acetylene on Cu(100)

Article Abstract:

A study was conducted to analyze the trimerization of acetylene to benzene on a Cu(100) surface. The study was carried out in a stainless steel chamber supporting four-grid LEED apparatus, a quadrupole mass spectrometer and an Auger spectrometer. Results indicated that the mass 26 signal imitated the trimerization rate at high coverages. Findings also showed that increases in the reaction yield correlated with increases in the initial acetylene coverage.

Copper, Surfaces (Materials), Acetylene, Surfaces (Technology)

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Electronic and chemical properties of Ce(sub 0.8)Zr(sub 0.2)O(sub 2)(111) surfaces: photoemmision, XANES, density-functional, and NO2 adsorption studies

Article Abstract:

The electronic properties of Ce(sub 0.8)Zr(sub 0.2)O(sub 2) are studied using first-principles density-functional calculations, photoemission, and X-ray absorption near-edge spectroscopy. The results of density-functional calculations show that the band gap in bulk is smaller than that in bulk CeO2, with the Or atoms in the mixed-metal oxide showing smaller positive charges than the cations.

Cerium & Compounds, Electric properties, Metallic oxides, Metal oxides, Density functionals, Density functional theory, Cerium

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NO2 adsorption on ultrathin theta-Al2O3 films: Formation of nitrite and nitrate species

Article Abstract:

Temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) are used to investigate the interaction of NO2 with an ordered theta-Al2O3/NiAl(100) model catalyst surface. Alumina is not completely inert and might stabilize some form of NO(sub x) under certain catalytic conditions.

Aluminum Oxide, Nickel Compounds, Absorption, Photoelectron spectroscopy, Chemical properties

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