id	keyword
ap-5987	coal
ap-5987	balance
ap-5987	material
ap-5987	process
ap-5987	mass
ap-5987	gasification
ap-5987	ucg
ap-5987	material balance
ap-5987	experiment
ap-5987	syngas
ap-5987	chemical
ap-5987	model
ap-5987	coal gasification