Abstract: A solution for suppressing the formation of contrails from the exhaust of an engine including by weight between about 0.01% to 2.5% of the non-corrosive surfactant, between about 1% and 8% water, and between about 85% and 99% ethylene glycol. Another solution may include by weight a monohydric, dihydric or polyhydric alcohol in an amount of between about 85% and 99% and the non-corrosive surfactant in an amount of between about 0.01% and 8%. Still another solution may include an inorganic nucleating or hygroscopic salt, such as ammonium iodide, ammonium fluoride, silver iodide or calcium chloride in monohydric, dihydric or polyhydric alcohols and surfactant mixtures. Yet another solution may include an inorganic salt in monohydric, dihydric or polyhydric alcohols.

Abstract: A method of suppressing the formation of contrails from the exhaust of an engine operating in cold temperatures including the steps of providing a combined nucleating agent and freeze-point depressant selected from the group of water soluble monohydric, dihydric, trihydric or other polyhydric alcohols, or mixtures thereof, forming the solution into a vapor, and injecting the solution into the exhaust of the engine. The solution may include a non-corrosive surfactant. Another solution may include an organic or an inorganic nucleating agent, or mixtures thereof, in monohydric, dihydric or polyhydric alcohols, or mixtures thereof, and in addition may contain one or more surfactants.

Abstract: A method of suppressing the formation of contrails from the exhaust of an engine including the steps of providing a solution of a non-corrosive surfactant in a combined carrier and nucleating agent selected from the group of water soluble monohydric, dihydric, trihydric or other polyhydric alcohols, forming the solution into a vapor, and injecting the solution into the exhaust of the engine. The solution may include by weight between about 0.01% to 2.5% of the non-corrosive surfactant, between about 1% and 8% water, and between about 85% and 99% ethylene glycol. Another solution may include by weight a monohydric, dihydric or polyhydric alcohol in an amount of between about 85% and 99% and the non-corrosive surfactant in an amount of between about 0.01% and 8%. Still another solution may include an inorganic nucleating or hygroscopic salt, such as ammonium iodide, ammonium fluoride, silver iodide or calcium chloride in monohydric, dihydric or polyhydric alcohols and surfactant mixtures.

Abstract: A gaseous (C.sub.1 to C.sub.4) hydrocarbon mixture having a high methane content (at least 80 percent by volume on a carbon dioxide-free basis) is obtained by passing a mixture of hydrogen and carbon monoxide at a volume ratio of about 47:53 to 60:40 at a temperature between about 350.degree. to about 450.degree. C. and a pressure of about 200 p.s.i.g. to about 10,000 p.s.i.g. at a volumetric space velocity of about 500 to about 6000 in contact with a sulfur resistant catalyst comprising an interspersed mixture of cobalt oxide, aluminum oxide and zinc oxide. The catalyst comprises about 1 to about 15 weight percent of cobalt oxide, about 15 to about 60 weight percent of aluminum oxide and about 35 to about 70 weight percent of zinc oxide.

Abstract: Low boiling (C.sub.1 to C.sub.4) aliphatic hydrocarbons are obtained by passing a mixture of hydrogen and carbon monoxide at a molar ratio of about 1:2 to 2:1 at a temperature between about 350.degree. and about 450.degree. C. and a pressure of about 600 p.s.i.g. to about 10,000 p.s.i.g. at a volumetric hourly space velocity of about 200 to about 6000 in contact with catalyst comprising a sulfided, interspersed mixture of cobalt oxide, aluminum oxide and zinc oxide. The catalyst, prior to sulfiding, comprises about 1 to about 15 weight percent of cobalt oxide, about 55 to about 85 weight percent of aluminum oxide and about 15 to about 30 weight percent of zinc oxide.

Abstract: Low boiling (C.sub.1 to C.sub.4) aliphatic hydrocarbons are obtained by passing a mixture of hydrogen and carbon monoxide at a molar ratio of about 1:2 to 2:1 at a temperature between about 350.degree. and about 450.degree. C. and a pressure of about 600 p.s.i.g. to about 10,000 p.s.i.g. at a volumetric hourly space velocity of about 200 to about 6000 in contact with catalyst comprising a sulfided, interspersed mixture of cobalt oxide, aluminum oxide and zinc oxide. The catalyst, prior to sulfiding, comprises about 1 to about 15 weight percent of cobalt oxide, about 55 to about 85 weight percent of aluminum oxide and about 15 to about 30 weight percent of zinc oxide.

Abstract: Low boiling (C.sub.1 to C.sub.3) aliphatic hydrocarbons are obtained by passing a mixture of hydrogen and carbon monoxide at a volume ratio of about 45:55 to 60:40 at a temperature between about 350.degree. and about 500.degree. C. and a pressure of about 200 p.s.i.g. to about 10,000 p.s.i.g. at a volumetric hourly space velocity of about 200 to about 6000 in contact with a catalyst comprising an interspersed mixture of cobalt oxide, aluminum oxide, zinc oxide and molybdenum oxide. The catalyst comprises about 0.2 to about 2.0 weight percent of cobalt oxide, about 55 to about 95 weight percent of aluminum oxide, about 5 to about 15 weight percent of zinc oxide and about 2 to about 20 weight percent of molybdenum oxide.

Abstract: A gaseous (C.sub.1 to C.sub.4) hydrocarbon mixture having a high methane content (at least 80 percent by volume on a carbon dioxide-free basis) is obtained by passing a mixture of hydrogen and carbon monoxide at a volume ratio of about 47:53 to 60:40 at a temperature between about 350.degree. and about 450.degree. C. and a pressure of about 200 p.s.i.g. to about 10,000 p.s.i.g. at a volumetric space velocity of about 500 to about 6000 in contact with a sulfur resistant catalyst comprising an interspersed mixture of cobalt oxide, aluminum oxide and zinc oxide. The catalyst comprises about 1 to about 15 weight percent of cobalt oxide, about 15 to 60 weight percent of aluminum oxide and about 35 to about 70 weight percent of zinc oxide.