412.    BURRELL, G. A.  Hydrogenation of Coal Processes.  Oil Gas. Jour., vol. 27, October 18, 1928, p. 56.

                  Motor fuels may be prepared from coal by hydrogenation of coal (Bergius process) or of CO.  Water gas (CO and H₂) is made to combine in the presence of various catalysts with or without pressure.  Processes in active stages of development in Germany are the Bergius process (pressure hydrogenation of coal), the I. G. Farbenindustrie process (pressure hydrogenation of coal with a catalyst), and the Fischer-Tropsch process (CO+H₂+a catalyst with or without pressure); in France the Patart process (CO₂+H₂+a catalyst+high pressure) and the Audibert process (CO+H₂+a catalyst+pressure); and in England the Nash process (CO+H₂+a catalyst).