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Preliminary Parameters to Produce Liquid Hydrocarbons from Synthesis Gas

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Bioenergy Engineering, 11-14 October 2009, Bellevue, Washington  BIO-097999.(doi:10.13031/2013.28874)
Authors:   Jason Street, James Warnock, James Wooten, Eugene Columbus, Mark White
Keywords:   syngas, gasoline-range hydrocarbons, gasifier, gasification, gasoline, Mo/H-Y, zeolite-Y, zeolite Y, wood feedstock, molybdenum catalyst, solid acid reaction, solid alcohol reaction

A system was created to be able to accurately discover the optimum temperature, flow-rate and pressure to efficiently create the maximum quantity of gasoline-range high octane liquid hydrocarbons from any carbon feedstock that can be gasified to produce synthesis gas (syngas). A study using the Mo/H-Y catalyst (zeolite Y with SiO2/Al2O3 = 80) in a one step catalytic reaction for the conversion of syngas to liquid gasoline-range hydrocarbons will be performed using this system. The zeolite catalyst Mo/H-Y has shown selectivity toward branched and cyclized alkanes. Efficiency of the system will be assessed by the type and amount of liquid gasoline-range hydrocarbons produced. The syngas contains approximately 18% hydrogen, 21% carbon monoxide, 11% carbon dioxide, 2% methane and 45% nitrogen produced by a down-draft gasifier. The up-stream syngas flow rate will be controlled and monitored using a mass flow controller. Temperature will be regulated by heating coils governed by a relay circuit board controlled by LabView. Variations in pressure, flow-rate and temperature will be used to optimize the gasoline-range liquid hydrocarbon output. Specific conditions will be maintained so that coking will not occur which would disable the catalyst from changing the molecular structures of the syngas into gasoline-range hydrocarbons. The system will have the capability to maintain a certain set-point temperature without any major temperature fluctuations. A plethora of different temperatures, pressures and flow rates will be used to pinpoint the optimum conditions for gasoline-range hydrocarbon creation.

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