A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 167
fumaric acid, and reduces nitrobenzoic acid, and trinitrophenol ; R. Vondracek,
Ii. Lindet, F. Plzak and B. Husek, and B. Rayman and O. SuIc, studied the hydrolysis
of sucrose ; C. H. Neilson, the hydrolysis of ethyl butyrate ; E. Schaer, oxidations by
benzoic peroxide, and quinone ; H. A. Taylor and M. Schwartz, and E. W. R. Steacie
and co-workers, the thermal decomposition of dimethyl ether, and diethyl ether ;
B. Bruns and M. Wanjan, the inversion of sugars ; H. A. Taylor, the decomposition
of acetone ; K. Suzuki, geraniol; L. Michaelis and E. S. G. Barron, the reduction of
cysteine ; Y. Shibata and K. Yamasaki, the oxidation of pyrogallol ; G. K. Hughes
and co-workers, the reduction of the bromoalkylbarbituric acids ; Y. Shibata and
K. Yamasaki, the oxidation of pyrogallol ; A. S. Richardson and A. O. Snoddy,
the hydrogenation of cotton-seed oil ; E. B. Maxted and C. H. Moon, the oxidation
of crotonic acid ; and E. Thoren, the catalase action. E. Salkowsky found that
glacial acetic acid even when mixed with hydrogen dioxide does not attack
platinum. W. G. Palmer studied the absorption of acetic acid by platinum.
J. H. Mathews observed that a soln. of trichloroacetic acid in nitrobenzene does
not attack platinum ; and J. Ii. Sammis observed that a soln. of copper oleate
in various solvents, and C. B. Gates, that oleic acid do not attack the metal.
A. Carpene observed that the metal was not attacked on standing 192 his. in
red wine ; and W. Thomson and F. Lewis observed that platinum has an injurious
effect on indiarubber. J. Ranedo studied the effect of platinum on the oxidation
of organic matter by sulphuric acid.
H. Moissan 2 ° observed that boron contains platinum when it has been prepared
in platinum vessels from a mixture of potassium and boric acid ; and E. Wohler
and H. St. C. Deville observed that boron forms a boride when heated with platinum
— vide 5. 32, 4. A. Sieverts and K. Bruning studied the absorption of hydrogen
by the platinum borides. O. Ruff and W. Menzel observed no reaction with boron
pentafluoride below a dull red-heat. J. G. Rose observed that borax which has
been fused in platinum vessels for 4 hrs. at a red-heat contained 03 ragrm. per
ICK) grms. H. V. Collet-Descotils observed that platinum is attacked by molten
borax and carbon. L. Pissarjewsky studied the catalytic decomposition of sodium
perborate by platinum. According to H. St. C. Deville, 21 H. N. Warren, F. P. Miles,
and H. Ie Chatelier, silicon readily attacks platinum at an elevated temp.—vide 6.
40, 14. F. C. Carter said that silicon forms a brittle alloy with platinum ; and silica
along with carbonaceous material or hydrogen has the same effect as indicated by
L. I. Dana and P. D. Foote, J. B. J. D. Boussingault, and A. Guyard. T. Traube
found that molten potassium silicate attacks platinum strongly; and W. P. White
found silicates had in general no action below 900°. W. Jander said that molten
silicates dissolve platinum not in the ionic form, but as metal ; and at its m.p.,
platinum takes up iron from fused silicates in the presence of reducing gases. The
attack of platinum crucibles by iron silicates was studied by T. Poleck, R. W. Mahon,
W. Jander, and E. Isaak and G. Tammann. C. G. Memminger found that topaz
fused in a platinum crucible under reducing conditions formed brittle platinum
silicide. W. R. Hodgkinson and F. K. S. Lowndes observed that silicon tetrafluoride
is decomposed by a red-hot platinum wire, forming crystals of silicon and
platinum fluoride. K. Fuwa studied the coloration of glass by platinum. The
catalysis of the oxidation of titanous sulphate by platinum black was studied by
B. Diethelm, B. Diethelm and F. Forster, and H. G. Denham. II. Rose, and
W. B. Giles noted that platinum crucibles are attacked by soln. of titanic acid in
the presence of nitric or sulphuric acid.
The action of platinum on the metals is discussed below. The favourable action
of platinum on the dissolution of metals in acids was discussed by L. H. Zenneck, 22
J. T. Conroy, and W. Ostwald. M. Philippson observed that when a platinum
plate is introduced into colloidal copper, prepared by cathodic disintegration, copper
is gradually precipitated. The precipitation is independent of the electrolytic
soln. press, of the precipitating metals, and these metals, under the influence of
the discharge of the colloidal particles during precipitation, are able in their turn