2681.     ---------------.  [PICHLER, H., AND BUFFLEB, H.]  [Synthesis of Paraffin Wax on Ruthenium Catalysts at Pressures up to 1,000 Atmospheres.]  Brennstoff-Chem., vol. 21, 1940, pp. 257-264; Chem. Zentralb., 1941, I, p. 850; Chem. Abs., vol. 36, 1942, p. 2253.

        Gas mixture (CO+2H₂) was passed over the catalyst (3 gm. of Ru) at a rate corresponding with 1 l. (normal temperature and pressure) of resultant gas per hr.  At 140° the conversion of CO into hydrocarbons rose from nil at 15 atm. to 18% at 100 atm. and 54% at 1,000 atm.  (36% of liquid and solid hydrocarbons); at 180° the conversion rose from 11% at 15 atm. to 70% at 100 atm. and 91% at 1,000 atm. (72% of liquid and solid hydrocarbons).  AT 100 atm. about 65% and at 1,000 atm. about 75% of the liquid and solid hydrocarbons consisted of paraffin waxes of melting point up to 134°.  At 200° per 100 atm. and half the above rate of gas passage, yields of 190 gm. per m.³ (normal temperature and pressure) of initial gas, that is, 91% of theory, were obtained.  The yields of liquid and solid hydrocarbons varied only slightly with temperature over the range 190°-240°; at higher temperature, especially above 300°, the formation of CH₄+CO₂ became marked.  Mixtures of CO₂ and H₂ interacted over a Ru catalyst at lower temperature than CO+2H₂ but only CH₄ and H₂O were formed.  The presence of CO₂ did not affect the interaction of CO and H₂.