[boswell] catalysis OF HYDROGENATION BY NICKEL 5 



Time Weight of water in grams 



. 0280 

 0.0158 

 0.0126 

 0.0126 

 0.0306 

 0.0152 



The nickel was allowed to stand at room temperature in an 

 atmosphere of hydrogen over night. Upon again passing hydrogen 

 at 275° the following results were obtained: 



Time Weight of Water in Grams 

 1 hour 0.0410 



1 " 0.0038 



1 " 0.0052 



1 " 0.0040 



It will be observed that a relatively large amount of water was 

 given ofif during the first hour after standing in hydrogen at room 

 temperature over night. 



The nickel was once more allowed to stand in an atmosphere of 

 hydrogen at room temperature over night and on the following 

 morning nitrogen was passed at room temperature. 



Time Water obtained in grams 

 1 hour 0.0252 



i " 0.0018 



2 



The tube containing nickel was now heated in a combustion 

 furnace to full heat of the gas burners and nitrogen again passed. In 

 two hours only .0076 g. of water was obtained. Here again it is 

 observed that the water obtained during the first hour after standing 

 over night in an atmosphere of hydrogen is relatively large. 



That considerable oxygen still remained on the nickel was proven 

 by passing hydrogen at the full heat of the furnace when 0.1040 g. 

 water was obtained. 



There are two explanations for the large amount of water ob- 

 tained after standing over night at room temperature in an atmo- 

 sphere of hydrogen: (1) hydrogen is adsorbed by the nickel on 

 reduction of the oxide and this adsorbed hydrogen, being larger in 

 amount at low temperature, reacts more rapidly with unchanged 

 oxide in the interior of the particles, even at room temperature, and 

 (2) that water vapour formed by the reduction of oxide at 275°C. is 

 adsorbed on the nickel and this water is given off on cooling. 



