Abstract
Forced concentration cycling was used to study the feasibility of rate and selectivity enhancement in FT synthesis. Our results indicate that it is possible to increase the time averaged rate of reaction by as much as 210% over the equivalent steady state rate. The improvements in selectivity are more complex. In general concentration cycling leads to increased rates of methane production. Under certain operating conditions it is possible to enhance the selectivity to propane by as much as 400% over the equivalent steady state rate. Selectivity enhancements for ethane and butane were also observed Analysis of the transient response data indicates that perhaps there are separate sites for methane and higher hydrocarbon synthesis. Transient response experiments showed that higher hydrocarbons are always produced before methane. During transient response and periodic operation methane production was found to be in phase with water production
Published Version
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