Abstract
The irradiation of coal by laser energy is one of the more promising new methods of pyrolyzing coal rapidly at high temperatures. Gaseous products from the laser irradiation of coals of various ranks were analyzed by mass spectrometry. The total gas yield varied inversely with coal rank, showing a four-fold increase between anthracite and lignite. The atomic C-H ratio for the gases was lower than for the corresponding coal. Yields of acetylene, hydrogen, carbon monoxide and carbon dioxide generally increased between anthracite and lignite. Changes were most pronounced between anthracite and low-volatile bituminous coal. Liquid products were not detected. The infrared spectrum of the solid residue showed few of the characteristic coal bands.
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