The effect of hydrothermal treatment on a Merseburg lignite |
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| Affiliation: | 1. Research Laboratory for Inorganic Chemistry, Hungarian Academy of Sciences, 1112 Budapest, Budaörsi ut 45, Hungary;1. Institute of Chemical Technology, Academy of Sciences of the GDR, 1199 Berlin, GDR;1. PMMAT Lab, Department of Physics, Faculty of Science, University Hassan II, Casablanca, Morocco;2. GREYC Lab, UMR CNRS 6072, University of Caen Basse-Normandie, France;1. Department of Environmental Science, Tezpur University, Tezpur, 784028, India;2. School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, 68583-0817, USA;3. Department of Energy, Tezpur University, Tezpur, 784028, India;4. Department of Environmental Studies, Visva Bharti University, Shanti Niketan, 731235, West Bengal, India |
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| Abstract: | Pyrolysis-g.c.-m.s. has been applied to study the effect on a lignite of hydrothermal treatment, in which coal is heated with water in an autoclave and hydroconversion, in which coal is heated with water and sodium formate in an autoclave. After the treatments, considerably smaller amounts of carbon oxides and carbon sulphides were found in the pyrolysates. The formation of the organic pyrolysis products was generally promoted by both treatments, whereas the yield of the hetero atom containing organic compounds as phenols and thiophenes was reduced considerably. The changes observed in the amounts of the various pyrolysis products indicate the modifications in the chemical structure of coals under the treatments applied, e.g. the partial elimination of carboxyl groups, carbonyl groups, ether bridges and sulphides. |
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