GB678941A - Improvements in or relating to hydrocarbon synthesis - Google Patents

Abstract

Hydrocarbons and oxygenated derivatives are prepared by contacting a gas mixture containing H2 and CO in a ratio of less than 2 : 1, under synthesis conditions, with a fluidized iron catalyst prepared by subjecting fresh iron oxide to reduction with hydrogen at 900-1500 DEG F., and subjecting the reduced product, before use in the synthesis, to an activating or precarbiding treatment with a mixture containing H2 and CO in a ratio of 2-8 : 1 at 500-700 DEG F. The final activating treatment may be continued until 50-55 per cent by weight of iron is converted to iron carbide. The reduction with hydrogen at 900-1500 DEG F. may be followed by a further reduction at 500-700 DEG F. Powdered iron oxide of particle size 0-200m with 50 per cent or more particles greater than 80m may be impregnated with alkali halide or carbonate and reduced at 1000-1100 DEG F. till the oxygen content of the iron is 3-10 per cent by weight. It is then activated at 500-700 DEG F. for several hours. Results of tests showing the increased resistance to oxidation and carbide retention, and reduction in carbon deposition and disintegration with catalyst prepared from pyrites ash containing sodium carbonate or potassium chloride, ammonia synthesis catalyst (fused magnetite), and mill scale are given. Specification 620,775 is referred to.ALSO:Hydrocarbons and oxygenated derivatives are prepared by contacting a gas mixture containing H2 and CO in a ratio of less than 2 : 1, under synthesis conditions, with a fluidized iron catalyst prepared by subjecting fresh iron oxide to reduction with hydrogen at 900-1500 DEG F, and subjecting the reduced product, before use in the synthesis, to an activating or precarbiding treatment with a mixture containing H2 and CO in a ratio of 2-8 : 1 at 500-700 DEG F. The final activating treatment may be continued until 50-55 per cent by weight of iron is converted to iron carbide. The reduction with hydrogen at 900-1500 DEG F may be followed by a further reduction at 500-700 DEG F. Powdered iron oxide of particle size 0-200m with 50 per cent or more particles greater than 80m may be impregnated with alkali halide or carbonate and reduced at 1000-1100 DEG F till the oxygen content of the iron is 3-10 per cent by weight. It is then activated at 500-700 DEG F for several hours. Results of tests showing the increased resistance to oxidation and carbide retention, and reduction in carbon deposition and disintegration with catalysts prepared from pyrites ash containing sodium carbonate or potassium chloride, ammonia synthesis catalyst (fused magnetite), and mill scale are given. Specification 620,775 is referred to.