Wucaiwan sub-bituminous coal(WSBC)was subjected to alkanolysis using isopropanol as solvent at 300℃,and the soluble(SP)and insoluble(ISP)compounds were obtained.The GC/MS analysis showed that the aromatic content of SP accounted for the largest percentage of the total amount of SP,which was 27.9%,followed by phenolic compounds,which indicated that the compounds containing benzene rings were more easily extracted during the isopropanol alkanolysis.The infrared spectra showed that the intensity of the absorption peaks of ISP in both aliphatic and aromatic regions increased significantly relative to that of the original coal,suggesting that the alkanolysis process destroyed the macromolecular structure of the coal,and generated new functional groups through bond breaking and alkanolysis reactions.From the TG-DTG curves,it could be seen that the weight loss rate of the raw coal was larger than that of ISP,and the second weight loss rate peak appeared in the temperature range of 400-500℃for both of them,in which the weight loss rate of WSBC reached the maximum at 450℃,and the temperature corresponding to the peak of the maximum weight loss rate of ISP was shifted to the right(480℃).The pyrolysis reaction of both samples was the most intense in the temperature interval of the second weight loss peak,which was attributed to the thermal cracking of the organic matter and a large amount of volatilization.The results of the Py-GC/MS showed that the detectable compounds in the pyrolysis products of WSBC and ISP at 450℃were mainly aliphatic hydrocarbons and oxygenated compounds,and alkanolysis led to a significant decrease in oxygenated compounds,but did not obviously remove nitrogenous compounds from ISP.
关键词
次烟煤/醇解/组成与结构特征/快速热解/气相色谱/质谱
Key words
sub-bituminous coal/alkanolyses/composition and structural characteristics/rapid pyrolysis/gaschromatography/mass spectrometry(GC/MS)
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