scholarly journals Studies of the Acidity and Ionic Conductivity of Silica-Supported Heteropoly Compounds. III. Paramagnetic Species Involved in the Dehydration Reaction on Supported 12-Molybdophosphoric Acid and Its Salts

1990 ◽  
Vol 63 (7) ◽  
pp. 2076-2082 ◽  
Author(s):  
Reiji Ohtsuka ◽  
Jun-ichi Kobayashi
Keyword(s):  
Ionic Conductivity ◽  
Paramagnetic Species ◽  
Heteropoly Compounds ◽  
Molybdophosphoric Acid ◽  
Dehydration Reaction

Dehydrogenation, Deamination and Disproportionation of Diethylamine over Heteropoly Compounds

1995 ◽  
Vol 60 (12) ◽  
pp. 2047-2056 ◽  
Author(s):  
Abdel-Ghaffar A. Ali ◽  
Laila I. Ali
Keyword(s):  
Reaction Mechanism ◽  
Continuous Flow ◽  
Flow System ◽  
Tungstophosphoric Acid ◽  
Lewis Acidity ◽  
Heteropoly Compounds ◽  
Molybdophosphoric Acid ◽  
System Transformation ◽  
Continuous Flow System

In a continuous flow system, transformation of diethylamine over heteropoly compounds was studied at 250 to 350 °C. It was found that ammonium molybdophosphate and tungstophosphate are the most active catalysts while copper molybdophosphate is the most stable one. 12-Molybdophosphoric acid and its salts were highly selective catalysts for dehydrogenation of diethylamine to ethyliden- ethylamine whereas 12-tungstophosphoric acid and its salts directed the reaction selectively to deamination. The role of Lewis acidity of metal cations, Bronsted acidity and basic sites in the reaction mechanism is discussed.

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