Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 4: Issue 4
Influence of composition and of activation temperature upon the adsorption and thermodesorption of ammonia on aluminium oxide-silica gels
Authors:
A. Pop Department of Chemistry Babes-Bolyai University Cluj Rumania

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P. Kröbl Department of Chemistry Babes-Bolyai University Cluj Rumania

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, and
P. Jozsa Department of Chemistry Babes-Bolyai University Cluj Rumania

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Pages:
451–459
Online Publication Date:
23 Jul 2005
Publication Date:
01 Dec 1972
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf01913802
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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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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