Srikantan, BS

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Reactions at the Surface of Hot Metallic FiIaments-Part V." Thsmfonfo rreariaefoa and catalytia aotiotfy at thr rtrtfa4e of hot mntaIUo wirsa: HaSCOs+CO* H g O  at ths e t r~ facs  of pbtinum, phihum ooated d t h  BaO and tharialsd tmgatan. (Received for publication, 7th Novmber, 1930.) A semiqualitative inveatigetion has been mdn on the emkioa of eleatrone from the surfma of pIatinnm and thoriated tangstan snd the minimum temperature at mhiab the thermionic emiesion is perceptible, has baan obtained by extrapolation. Thin minimum temperature is found to be the m e  aa that regaired td atart tha i~tersotion of COB sad Hz on tbwe sarfaces. Hydrogen is found tu be sotivated at tho same ternperatam, whilst CO, is aotivetd at a lower temperetnre. Tbe  oxidation of methane at the platinum eurfm is eho ehom t o  be similar. It is mnoluded that the aotivation of gsserr at a natalyet is s large gxtent influenced by the eapaeiky of the s u r h  ta emit electrom at that Cmperature. The phenomenon of ~urfaae oatalysiu greatly dependa en tha adsorption of the reactants and their consequent tbctiaation by the association with the surface. The preceding parts of 1 01, Perh I-W, d, f d h n  Cham, Sw,, 1989 (VI), tE,9sl, 948,359; 1980 FVmr8, 1411. 3 

Reactions at the Surface of Hot Metallic FiIaments-Part V.

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