Infrared study of the pyrolysis products of sporopollenin and lignite |
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Authors: | Paul G Rouxhet Michel Villey Agnès Oberlin |
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Institution: | 1. Groupe de Physico-Chimie Minérale et de Catalyse, Universitè Catholique de Louvain, Place Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium;2. Equipe de Recherche du C.N.R.S. no 131, Laboratoire Marcel Mathieu, 45045 Orleans, France |
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Abstract: | The effect of pyrolysis at increasing temperature on sporopollenin, lignite and sporopollenin oxidized at 200°C has been investigated using measured infrared band absorption coefficients.Oxidation of sporopollenin in air at 200°C is marked by a decrease in the content of saturated hydrocarbon chains and a strong increase in the concentration of carboxylic acid groups.Pyrolysis of a thick bed of sporopollenin at increasing temperatures leads to the removal of a large proportion of oxygenated functions, before the removal of hydrocarbons. For lignite and oxidized sporopollenin, the loss of both types of functional groups extends over a broader temperature range. Reorganization of the carbonaceous residue at high temperature is hindered if a sufficiently low content of oxygenated functions, carbonyl and carboxyl as well as hydroxyl and ether groups, is not reached before the elimination of hydrocarbons. |
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Keywords: | To whom correspondence should be addressed |
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