In-situ monitoring of the stabilization with hydrogen of free radicals thermally induced from coal using high pressure e.s.r., d.t.a. and p.d.a. equipment |
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Authors: | Tetsuro Yokono Shoichi Iyama Yuzo Sanada Kazuo Makino |
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Affiliation: | 1. Coal Research Institute, Faculty of Engineering, Hokkaido University, North 13, West 8, Sapporo 060, Japan;2. High-Pressure Chemical Engineering Laboratory, North 15, West 14, Sapporo 060, Japan |
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Abstract: | High temperature, high pressure e.s.r. measurements of the hydrogenation reaction of Taiheiyo coal in the presence of catalysts were carried out to understand the stabilization of thermally and/or catalytically induced free radicals. A decrease in free radical concentration with increasing temperature was observed for ZnCl2 and SnCl2 · 2H2O catalysts at 10MPa under hydrogen gas. High pressure modified single-cell d.t.a. and p.d.a. equipment augmented the uniquely designed high temperature, high pressure e.s.r. cell. The hydrogenation reaction was monitored under the same experimental conditions as for e.s.r. From the results of the combination of high temperature, high pressure e.s.r. with high pressure d.t.a. and p.d.a., it was established that H2 molecules can react efficiently with free radicals from coal molecules created by the presence of ZnCl2 and SnCl2 · 2H2O catalysts. |
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Keywords: | coal hydrogen free radicals high pressure e s r d t a p d a |
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