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                  The synthesis-gas generator consists of a burner for coal gas to form CO+H₂ with Ni-MgO catalyst to convert residual CH₄ with steam into CO+H₂.  Soot particles (diameters of frequency maximum about 2 microns) in the flame are nearly completely removed by reactions with steam catalyzed by Ni vapor originating from the catalyst bed or from Ni-salt solutions injected into the generator.  Injection of solutions of alkali and alkaline-earth salts likewise suppresses the formation of soot.  Since these catalysts are present as colloidal particles, they facilitate the reaction between soot and steam by preventing coagulation of the primary soot particles.