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Alternatively, ethane and propane can be converted into more usable products, such as gasoline, through a twostep process. The fi rst step, dehydrogenation, is a chemical process that removes hydrogen from an organic molecule such as ethane, subsequently creating ethylene. The second step, oligomerization, is the chemical process combining the products of dehydrogenation into longer chain products. These two processes are traditionally performed under diff erent reaction temperatures and pressures with separate catalysts. In this research project, a single catalyst that can perform both reactions at comparable reaction conditions was developed. A single-site cobalt catalyst (Co/SiO2) was synthesized using standard catalyst preparation methods and used in dehydrogenation and oligomerization. Propane dehydrogenation on Co/SiO2 showed the catalyst’s ability to activate C-H bonds and had propylene selectivity above 98% at 6% conversion. Oligomerization was performed at temperatures above 400oC and at atmospheric pressure and resulted in conversions of 3%–6% with high selectivity to higher molecular weight hydrocarbons. High selectivity demonstrates success in that the products formed were desirable. High pressure (15–20 atm) should lead to higher conversions and the subsequent production of liquid fuels. The ultimate transformation of excess ethane and propane to liquid fuel products will allow shale gas to be compatible with the current United States transportation infrastructure, making it a viable alternative fuel.

journal of purdue undergraduate research

Catalyst-Assisted Transformation of Shale Gas to Transportation Fuels: Performance of a Single-Site Cobalt Catalyst in Dehydrogenation and Oligomerization Processes