gasify
verb
gas·i·fy ˈga-sə-ˌfī 
gasified; gasifying
transitive verb
: to convert into gas
gasify coal
intransitive verb
: to become gaseous
gasifier
ˈga-sə-ˌfī(-ə)r
noun 
Example Sentences
Recent Examples on the Web And, already, companies like Sundrop Fuels are using the sun's heat to gasify the plant stalks and other biomass built by photosynthesis to make a better fuel. 
David Biello, Scientific American, 23 Sep. 2010 After about a year of gasifying coal, the plant was ordered to switch to natural gas because the electricity it coal gasification produced was too expensive. Emily Hopkins, USA TODAY, 19 Mar. 2018 Instead, Kemper has decided to burn relatively cleaner natural gas instead of gasifying coal and capturing the CO2 from it. Megan Geuss, Ars Technica, 9 Feb. 2018
David Biello, Scientific American, 23 Sep. 2010 After about a year of gasifying coal, the plant was ordered to switch to natural gas because the electricity it coal gasification produced was too expensive. Emily Hopkins, USA TODAY, 19 Mar. 2018 Instead, Kemper has decided to burn relatively cleaner natural gas instead of gasifying coal and capturing the CO2 from it. Megan Geuss, Ars Technica, 9 Feb. 2018 Word History
First Known Use
circa 1828, in the meaning defined at transitive sense