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Aluminium oxide gel and aluminium oxide-silica gels of different compositions were prepared and activated at different temperatures. The adsorption of NH3 was studied in a McBain type balance at 20 torr and 5×10−3 torr at 25°. The thermodesorption of NH3 was studied at 5×10−3 torr between 25 and 550° at a constant heating rate of 4°/min. The desorption was followed by recording the thermogravimetric curve and the pressure oscillations in the system (p — T curve). The influence of composition and activation temperature is discussed. Chemisorption of a monomolecular layer is assumed in three main types of pores, together with the formation of a second monomolecular layer held by hydrogen bonds.

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Study on the thermal decomposition of solids in fluidized bed

I. Isothermal decomposition of diammonium hydrogenphosphate

Journal of Thermal Analysis and Calorimetry
Authors: C. Liteanu, F. Margineanu, and P. Kröbl

Reliable thermodynamic parameters for the thermal decomposition of diammonium hydrogenphosphate [(NH4)2HPO4] may be obtained using a fluidized bed. For the same size of particle, at the same temperature, but for different carrier gases, the rate constant and activation energy increase in the following order: air, methane, hydrogen. For the same carrier gas (air) the rate constant increases when the particle size decreases.

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Study of the thermal decomposition of solids in a fluidized bed, III

The influence of the humidity upon the thermal decomposition of diammonium hydrogen phosphate under isothermal conditions

Journal of Thermal Analysis and Calorimetry
Authors: F. Margineanu, P. Kröbl, and C. Liteanu
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Study of the thermal decomposition of solids in a fluidized bed, II

Thermal decomposition with programmed temperature of diammonium hydrogen phosphate

Journal of Thermal Analysis and Calorimetry
Authors: P. Kröbl, F. Margineanu, and C. Liteanu
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