Influence of transition metal salts and pyrolysis conditions on the product yield via Jimsar oil shale pyrolysis; pp. 304–318Full article in PDF format | 10.3176/oil.2020.4.04
In this study, transition metal salts Fe2O3, CoCl2·6H2O and MnSO4·H2O were chosen to be catalysts for Jimsar oil shale pyrolysis. The pyrolysis behaviors of samples in the presence of different catalysts were compared using a thermogravometric (TG) analyzer first. Then the most effective catalytic pyrolysis process was analyzed by thermogravimetry-mass spectrometry (TG-MS). Of the three catalysts investigated, CoCl2·6H2O performed best. With CoCl2·6H2O, the initial reaction temperature of the pyrolysis process was reduced by about 100 °C and the temperature range was decreased from 435–1000 °C to 330–650 °C. The yields of the pyrolysis products CO/ethene and propyne were the highest, while ethene accounted for the major part of CO/ethene. With increasing heating rate, the yields of alkenes and alkynes increased, those of H2O, methane, alkanes and aromatic hydrocarbons decreased, whereas the yields of CO/ethene, H2S, ethane, propene and CO2/propane changed but a little. These results and analysis allowed a conclusion to be made that with CoCl2·6H2O as a catalyst, the most optimal heating rate for Jimsar oil shale pyrolysis was 5 °C/min.
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