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Heats of Desorption of Ammonia and Simple Organic Materials from Bentonite¹

ABSTRACT

The differential thermal analysis apparatus was used as a means of determining the heats of desorption of NH₃, 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 NH₃ 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.

¹ Contribution from the Department of Soil Science and authorized for publication by the Director as Journal Article No. 2890, Michigan Agr. Exp. Sta., East Lansing. Presented before Div. II, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo.

² Assistant Professor and Professor, respectively.

Received for publication November 9, 1961. Accepted for publication June 18, 1962.