Reactions of Atoms with Magnesium Oxide Surfaces Studied in a Flow System by ESR-Spectroscopy

1975 ◽  
Vol 79 (1) ◽  
pp. 71-77 ◽  
Author(s):  
P. Svejda ◽  
R. Haul ◽  
D. Mihelcic ◽  
R. N. Schindler
Keyword(s):  
Magnesium Oxide ◽  
Esr Spectroscopy ◽  
Flow System ◽  
Oxide Surfaces

An electron spin resonance study of the reactions of hydrogen atoms with halocarbons

1986 ◽  
Vol 64 (11) ◽  
pp. 2192-2195 ◽  
Author(s):  
William E. Jones ◽  
Joseph L. Ma
Keyword(s):  
Rate Constants ◽  
Gas Flow ◽  
Esr Spectroscopy ◽  
Flow System ◽  
Electron Spin Resonance Study ◽  
Absolute Rate ◽  
Hydrogen Atoms ◽  
Vinyl Halides ◽  
Spin Resonance ◽  
Spin Resonance Study

The absolute rate constants for the reaction of H atoms with methyl- and vinyl-halides have been determined using esr spectroscopy and a conventional gas flow system. The rate constants determined at 298 ± 2 K at a pressure of 0.55 Torr are methane, (1.7 ± 0.3) × 10−17; ethane, (2.3 ± 0.5) × 10−17; methylfluoride, (4 ± 3) × 10−15; methylchloride, (8 ± 2) × 10−16; methylbromide, (2.1 ± 0.6) × 10−14; vinylfluoride, (1.47 ± 0.02) × 10−13; vinylchloride, (1.66 ± 0.08) × 10−13; and vinylbromide (4.07 ± 0.73) × 10−13 in units of cm3 molecule−1 s−1.

Diffusion of adatoms and small clusters on magnesium oxide surfaces

2009 ◽  
Vol 21 (26) ◽  
pp. 264001 ◽  
Author(s):  
Riccardo Ferrando ◽  
Alessandro Fortunelli
Keyword(s):  
Magnesium Oxide ◽  
Oxide Surfaces ◽  
Small Clusters

Acid-base properties of model magnesium oxide surfaces

Langmuir ◽  
1991 ◽  
Vol 7 (7) ◽  
pp. 1426-1431 ◽  
Author(s):  
X. D. Peng ◽  
Mark A. Barteau
Keyword(s):  
Magnesium Oxide ◽  
Oxide Surfaces ◽  
Acid Base ◽  
Base Properties

Atomistic Simulation of the Surface Carbonation of Calcium and Magnesium Oxide Surfaces

2009 ◽  
Vol 113 (19) ◽  
pp. 8320-8328 ◽  
Author(s):  
Jeremy P. Allen ◽  
Stephen C. Parker ◽  
David W. Price
Keyword(s):  
Magnesium Oxide ◽  
Atomistic Simulation ◽  
Oxide Surfaces ◽  
Calcium And Magnesium

The adsorption of hydrogen and oxygen on magnesium oxide: The effect of γ-irradiation

1977 ◽  
Vol 30 (5) ◽  
pp. 971 ◽  
Author(s):  
RJ Breakspere ◽  
LAR Hassan
Keyword(s):  
Magnesium Oxide ◽  
Hydrogen Adsorption ◽  
Oxide Surfaces ◽  
Γ Irradiation ◽  
Temperature Range ◽  
Adsorption Of Hydrogen ◽  
Increasing Temperature ◽  
Defect Centres

The adsorption of hydrogen and oxygen on magnesium oxide surfaces with and without the influence of continuous γ-irradiation has been investigated. The temperature range for hydrogen was 294-773 K, and for oxygen 294-973 K. In the absence of radiation little adsorption of oxygen was detected below 573 K, but above this temperature an activated process requiring an Ea of 60.6�5.0 kJ mol-1 was obtained. At all temperatures, continuous γ-irradiation enhanced the adsorption, and a mechanism involving (e-|□-)s defect centres has been proposed. Hydrogen adsorption was detected at all temperatures in the absence of radiation and an enhancement of the uptake was noted during radiation at all temperatures above 294 K. ��� The Gads for oxygen decreased with increasing temperature whilst that for hydrogen increased with temperature. A mechanism for this marked difference has been proposed.

scholarly journals How surface reparation prevents catalytic oxidation of carbon monoxide on atomic gold at defective magnesium oxide surfaces

2016 ◽  
Vol 18 (27) ◽  
pp. 18590-18597 ◽  
Author(s):  
Kai Töpfer ◽  
Jean Christophe Tremblay
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Oxidation ◽  
Magnesium Oxide ◽  
First Principles ◽  
Atomic Oxygen ◽  
Gold Atom ◽  
Oxide Surfaces ◽  
Oxidation Of Carbon Monoxide

First principles simulations of CO and O2 on a single gold atom deposited at defective magnesium oxide surfaces reveal that surface reparation prevents catalytic oxidation by insertion of either molecular or atomic oxygen inside the defect.

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