synfuel

noun

1. (countable, uncountable)Any of several fuels synthesized from coal or shale etc, or fermented from grain etc.

   “President Jimmy Carter was proposing a major effort to increase U.S. energy independence by developing “synfuels”—liquid fuels made from coal, oil shales, and tar sands—and scientific experts had warned that this could accelerate CO₂ accumulation.”

2. (countable, uncountable)Any of several fuels created by chemical synthesis from simple feed stock inputs, of power, energy, heat, water, carbon dioxide, or simple compounds.