A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 159
G. M. Schwab and H. Schmidt, A. Trillat, S. Uchida, R. Vondracek, H. W. Webb,
and H. C. Woltereck—vide 8. 49, 18 ; the formation of ammonia from nitric acid
and alcohol in the presence of platinum black, by J. W. Dobereiner ; W. Skey
noted that aq. ammonia affects the surface of platinum so that it cannot be amalgamated
"with mercury until it has been treated with an acid. R. E. Burk examined
the effect of platinum on the thermal decomposition of ammonia. R. Coustal and
H. Spindler found that a platinum anode is slowly attacked in liquid ammonia.
The decomposition of hydrazoic acid by platinum as catalyst was studied by
E. Oliveri-Mandala. The decomposition of hydrazine, 2N2H4== 2NH34-N2-J-H2,
and 3N2H4=2NH3+2N2-J-3H2, with platinum black as catalyst was studied by
A. Gutbier and K. Neundlinger, K. Neundlinger, and E. Oliveri-Mandala. A. Purgotti
and L. Zanichelli found that platinum freed from air would not endure the
decomposition of hydrazine, whilst ordinary platinum preparations will do so,
but the deaerated platinum will endure the decomposition of hydrogen dioxide,
and of hydroxy !amine. The decomposition of hydrazine sulphate with platinum
as a catalyst was studied by S. Tanatar ; and the oxidation of hydrazine, N2H4-I-O2
-2H2O-J-N2, by A. Purgotti and L. Zanichelli. The reduction of hydroxylamine
to ammonia in the presence of finely-divided platinum : 4NH2OH -2NH3
-J-N2O-|-3H20, was studied by V. Meyer, A. Findlay and W. Thomas, O. Loew,
O. Flaschner, E. Oliveri-Mandala, and S. Tanatar.
H. Cassel and E. Gltickauf, 16 and J. Luke and R. Fricke observed that nitrous
oxide has no action on glowing platinum ; J. Luke and R. Fricke found that the
nitrous oxide is decomposed. E. W. R. Steacie and J. W. McCubbin, G. M. Schwab
and B. Eberle, J. K. Dixon and J. E. Vance, M. S. Shah, J. A. Hedvall and coworkers,
G. van Praagh and B. Topley, and C. N. Hinshelwood and O. R. Prichard
studied the effect of platinum on the thermal decomposition of nitrous oxide ;
L. Duparc and co-workers, the hydrogenation of this oxide with platinum as
catalyst; and M. L. Nichols and I. A. Derbigny, the reduction of the oxide by
titanous chloride. W. R. Hodgkinson and F. K. S. Lowndes could not detect
any action when a red-hot platinum wire is exposed to nitric oxide. L. Duparc
and co-workers studied the hydrogenation of nitric oxide with platinum as catalyst ;
and J. Zawadzky and co-workers, the decomposition of nitric oxide. P. Sabatier
and J. B. Senderens did not observe any oxidation of platinum by nitrogen
peroxide. G. B. Taylor and co-workers studied the hydrogenation of nitric oxide
in the presence of platinum ; and T. E. Green and C. N. Hinshelwood, the decomposition
of the gas by hot platinum wire. L. I. de N. Ilosva observed that "when
air is passed over platinum wire at 280° to 350°. spongy platinum at 250° to 350°,
or platinum black at 180° to 300°, nitrogen trioxide is formed. The oxidation of
nitrogen with heated platinum as catalyst was studied by O. Dieffenbach and
W. Moldenhauer, K. Kaiser, O. Loew, D. R. Lovejoy, and L. Wohler ; the catalytic
action of platinum on the decomposition of nitric oxide, by J. L. Gay Lussac,
M. Berthelot, F. Emich, KL. Jellinek, and P. Sabatier and J. B. Senderens—vide
8. 49, 35 ; and the reduction of nitrogen oxides by hydrogen with platinum as
catalyst, by S. Cooke, A. Jouve, and the Wertdeutsche Thomasphosphatwerke.
J. J. Sudborough found that nitrosyl chloride does not attack platinum in the
cold, but at 100°, PtCl4.2NOCl is slowly formed. L. Wohler observed that nitrous
acid free from chlorides does not dissolve platinum black. The reduction of nitrous
acid, and of alkali and ammonium nitrites, by platinum black was studied by
A. A. Blanchard, S. Cooke, O. Flaschner, O. Loew, J. Meyer and E. Triitzner, and
H. N. Warren. R. Vondracek suggested that the decomposition of ammonium
nitrite by platinum black proceeds in two stages : firstly, the platinum black,
which, to begin with, contains oxygen, oxidizes the ammonium nitrite, thus :
2NH4N02+5cPtOn-fyH20=N2-f-2HN02+a;Pt+(2/-|-3)H20, and, secondly, the
nitrous acid formed in the first stage is reduced by the platinum, which is now
oxygen-free, thus : 2nHN02-hasPt=nN2+^H2O H-Pt^On. L. Wohler found that
nitric acid does not dissolve platinum black. C. Marie observed that warm, cone.