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Heats of Desorption of Ammonia and Simple Organic Materials from Bentonite
Author(s) -
Ellis Boyd G.,
Mortland M. M.
Publication year - 1963
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1963.03615995002700010012x
Subject(s) - ethylamine , desorption , ammonia , bentonite , methylamine , chemistry , decomposition , thermal decomposition , atmospheric temperature range , nitrogen , inorganic chemistry , thermodynamics , organic chemistry , adsorption , chemical engineering , physics , engineering
The differential thermal analysis apparatus was used as a means of determining the heats of desorption of NH 3 , methylamine, and ethylamine from bentonite clay. A method was developed using nitrogen gas to prevent oxidation of the sample during analysis. The average heat of desorption of NH 3 and methylamine for the temperature range of 200° to 450°C. was found to be 35.3 and 40.9 kcal. per mole, respectively. In each case the desorption was accompanied by loss of equal moles of water. It is postulated that the water loss arises from decomposition of Al(OH) 3 . The average heat of desorption of ethylamine for the same temperature range was 157 kcal. per mole; however, the simultaneous loss of large quantities of water accounted for most of the heat change.