Tungsta supported on zirconia and alumina catalysts: temperature-programmed desorption/reaction of methanol and pyridine DRIFTS studies

1996 ◽  
Vol 37 (1-2) ◽  
pp. 57-62 ◽  
Author(s):  
Gustavo Larsen ◽  
Srinivasanallur Raghavan ◽  
Manuel M�rquez ◽  
Edgar Lotero
Keyword(s):  
Temperature Programmed Desorption ◽  
Temperature Programmed ◽  
Desorption Reaction ◽  
Alumina Catalysts

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.

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