THERMAL EVOLUTION OF GASES 



77 



dioxide thus formed is subsequently absorbed as before and the 

 amount measured will give the amount of carbon monoxide that has 

 been formed. 



Now, knowing the heat of formation of carbon dioxide and of 

 carbon monoxide, the heat due to their formation may be determined. 

 This, then, would complete the analysis of the heat of adsorption. 



The following samples have been tested : 



No.l.^ — Carbonized Lignite (26.4059 gms.) obtained from the 

 Department of Mines, Ottawa. 



No. 2." — Cocoanut Charcoal (26.6947 gms.). 



No. 3.^ — Commercial Wood Charcoal (13.8772 gms.). 



No. 4. — Activated Charcoal (24.1542 gms.). This charcoal 

 is made by exposing the raw material to high pressure 

 steam at about 1000°C. It ,was obtained from the 

 National Lamp Works, Cleveland, Ohio. 



No. 5.— Lignite Carbonized at 350°C. (14.9400 gms.). 



No. 6. — Lignite Carbonized at 450°C. (15.7534 gms.). 



No. 7. — Lignite Carbonized at 550°C. (14.9581 gms.). 



No. 8.— Cocoanut Charcoal (28.6883 gms.). 



The gases used were air, oxygen, nitrogen and carbon dioxide. 



In the following experiments T is the approximate rise in temper- 

 ature of the sample when the gas is first admitted to the apparatus, 

 X is the amount of gas adsorbed by the sample in c.c.'s N.T.P. Tests 

 for CO and CO2 were not made in the early experiments. Temperatures 

 were read correctly to a tenth of a degree. In all the experiments the 

 samples of absorbent were allowed to become saturated with gas, 

 then the gas was pumped off, and the process repeated time and time 

 again. 



Experiment 1. Sample No. 1. Carbonized Lignite (26.4 gms.). Gas used: Air. 



°C 

 6.0 

 6.0 

 6.0 



Gas 

 adsorbed 



c.c. N.P.T. 

 201.9 

 166. 1 

 163. 1 



Total 

 Heat 



Calories 

 180.1 

 124.7 

 160.7 



Heat per 

 gram sample 



Calories 

 6.8 



4.8 

 G. 1 



Heat per 

 c.c. gas 

 adsorbed 



Calories 

 0.88 

 0.75 

 0.98 



ExPERl.MENT 2. Sample No. 1. Gas used: Nitrogen. 



°C 

 1.2 

 2.2 



Gas 

 adsorbed 



c.c. N.P.T. 

 195.5 

 198.5 



Total 

 Heat 



Calories 

 41.0 

 41.6 



Heat per 

 gram sample 



Calories 

 1.6 

 1.6 



Heat per 



c.c. gas 



adsorbed 



Calories 

 0.21 

 0.21 



