Catalytic Coal Conversion Support: Use of Laser Flash-Pyrolysis for Structural Analysis. Progress Report, September 1-December 31, 1979

摘要

The gaseous products observed from the neodymium laser pyrolysis of coal appear to be generated out of the highly energetic plasma. Neodymium laser pyrolysis in helium, hydrogen, or deuterium atmospheres did not affect the product distribution. Deuteration of the pyrolysis products was observed when deuterium was used as the carrier gas. High speed photography visualized the explosive interaction of the neodymium laser beam with the coal pellet. The plasma generated during this event and its direction of propagation are clearly shown. Similar gaseous pyrolysis products are observed with neodymium laser pyrolysis of five different ranks of coal. Laser pyrolysis with a continuous wave CO sub 2 laser produced a significantly larger number of components than did the neodymium laser. There is little similarity between the pyrolysis products obtained with the neodymium and those obtained with the continuous wave CO sub 2 laser. (ERA citation 06:013317)