Abstract
The present work provides a detailed characterization and kinetic study of oil shale of Upper Assam, India. The physicochemical characteristics of oil shale were studied by proximate analysis, elemental analysis, Fourier transform infrared spectroscopy and X-ray diffraction. The physicochemical study showed the oil shale to be of siliceous type, sour in the presence of aliphatic, aromatic and phenolic compounds. The thermal decomposition of the oil shale was studied using thermogravimetric analysis at heating rates of 10, 20, 30 and 50 °C min−1. The kinetic study of oil shale pyrolysis process was performed on the thermogravimetric data using three model-free isoconversional methods, viz. Friedman, Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose. The reaction mechanisms were determined using the Criado master plot. The understanding of the composition of Indian oil shale and pyrolysis process kinetics can help establishing the experimental parameters for the extraction of valuable products from the oil shale.
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