Stable Stoichiometry of Gas-Phase Manganese Oxide Cluster Ions Revealed by Temperature-Programmed Desorption

2015 ◽  
Vol 119 (31) ◽  
pp. 8433-8442 ◽  
Author(s):  
Kohei Koyama ◽  
Satoshi Kudoh ◽  
Ken Miyajima ◽  
Fumitaka Mafuné
Keyword(s):  
Manganese Oxide ◽  
Gas Phase ◽  
Temperature Programmed Desorption ◽  
Cluster Ions ◽  
Oxide Cluster ◽  
Temperature Programmed

Optimized Reactants Mixture and Products Hydrolysis in the Manganese Oxide Thermochemical Cycle

2009 ◽  
Author(s):  
Francesca Varsano ◽  
Mariangela Bellusci ◽  
Carlo Alvani ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Manganese Oxide ◽  
Hydrogen Evolution ◽  
Temperature Programmed Desorption ◽  
Inert Gas ◽  
Thermochemical Cycle ◽  
Temperature Programmed ◽  
Lower Temperature ◽  
Desorption Reaction ◽  
Aqueous Slurry

A novel system composed by an aqueous slurry prepared by MnO and NaOH mixture was tested for the hydrogen production in the sodium manganese oxide thermochemical cycle. The hydrogen evolution occurs at lower temperature than conventional mixtures utilized in the cycle. Experiments performed in a Temperature Programmed Desorption/Reaction apparatus (TPD/TPR) have evidenced hydrogen production around 500°C. The hydrolysis step of α-NaMnO2 has been studied and the importance to conduct hydrolysis reaction under inert gas is discussed. A manganese disproportion mechanism is hypothesized to explain the appearance of manganese (II) and manganese (IV) containing phases.

Oxidation of CO by Aluminum Oxide Cluster Ions in the Gas Phase

2008 ◽  
Vol 112 (21) ◽  
pp. 4732-4735 ◽  
Author(s):  
Grant E. Johnson ◽  
Eric C. Tyo ◽  
A. W. Castleman
Keyword(s):  
Aluminum Oxide ◽  
Gas Phase ◽  
Cluster Ions ◽  
Oxidation Of Co ◽  
Oxide Cluster ◽  
Aluminum Oxide Cluster

Molybdenum Oxide Cluster Ions in the Gas Phase:  Reactions with Small Alcohols

1998 ◽  
Vol 17 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Elena F. Fialko ◽  
Andrey V. Kikhtenko ◽  
Vladimir B. Goncharov
Keyword(s):  
Gas Phase ◽  
Molybdenum Oxide ◽  
Cluster Ions ◽  
Gas Phase Reactions ◽  
Oxide Cluster

Stability and Effect of Hydration on Calcium Oxide Cluster Ions, CanOm+, in the Gas Phase

2018 ◽  
Vol 91 (10) ◽  
pp. 1530-1536 ◽  
Author(s):  
Daigo Masuzaki ◽  
Yuma Takehashi ◽  
Fumitaka Mafuné
Keyword(s):  
Gas Phase ◽  
Calcium Oxide ◽  
Cluster Ions ◽  
Oxide Cluster

Gas-phase photocatalytic oxidation of motor fuel oxygenated additives

2004 ◽  
Vol 49 (4) ◽  
pp. 141-145 ◽  
Author(s):  
S. Preis ◽  
J.L. Falconer
Keyword(s):  
Formic Acid ◽  
Gas Phase ◽  
Continuous Flow ◽  
Photocatalytic Oxidation ◽  
Motor Fuel ◽  
Temperature Programmed Desorption ◽  
Methyl Tert Butyl Ether ◽  
Tert Butyl ◽  
Oxygenated Additives ◽  
Temperature Programmed

Methyl tert-butyl ether (MTBE) and tert-butyl alcohol (TBA) were oxidized in the gas phase by photocatalytic oxidation (PCO). Transient PCO was carried out at room temperature on TiO2 (Degussa P25), 0.2% Pt-TiO2, and 2% Pt-TiO2 catalysts. Surface-adsorbed reaction by-products were characterized by temperature-programmed desorption (TPD) and oxidation (TPO). Continuous flow PCO was also carried out at 373 K on TiO2. Acetone, H2O, and CO2 were the gas-phase products for PCO of TBA and MTBE, and formic acid was adsorbed on the TiO2 surface. Temperature-programmed desorption of TBA and MTBE formed 2-methyl-1-propene, water (TBA), and methanol (MTBE). During continuous-flow PCO, acetone desorbed in molar amounts equal to the amount of decomposed TBA and MTBE. The Pt/TiO2 catalysts had higher rates of complete oxidation during PCO and TPO. Injection of water during transient PCO increased the rates of oxidation of adsorbed TBA, formic acid, and acetone. Photocatalytic oxidation of TBA proceeded faster in humid air than dry air, but MTBE oxidation was less sensitive to humidity. The TiO2 catalyst was stable for MTBE, TBA, and acetone PCO at 373 K. The PCO at low conversions followed the Langmuir-Hinshelwood model.

Formation, structure and bond dissociation thresholds of gas-phase vanadium oxide cluster ions

2001 ◽  
Vol 114 (2) ◽  
pp. 798 ◽  
Author(s):  
R. C. Bell ◽  
K. A. Zemski ◽  
D. R. Justes ◽  
A. W. Castleman
Keyword(s):  
Vanadium Oxide ◽  
Gas Phase ◽  
Cluster Ions ◽  
Oxide Cluster ◽  
Bond Dissociation
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