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Vitrinite- and inertinite-rich samples separated from Shenfu-Dongsheng (SD) and Pingshuo (PS) coals were extracted with CS 2 and the extraction solutions were analyzed with GC/MS. The results show that extract yields of the two maceral-rich samples (MRSs) from PS coal are much higher than those from SD coal; for MRSs from the same coal, the yield of vitrinite-rich sample is larger than that...
Three coal macerals with high purities were separated from Pingshuo gas coal. The formation rules of HCN and NH 3 during macerals pyrolysis and gasification were investigated. Experiments were carried out in a tubular quartz reactor at atmospheric pressure. The reactor allowed coal particles to be heated up rapidly and held for a prespecified period of time at a peak temperature. The amount...
Four Chinese bituminous coals were extracted with CS 2 , n-hexane, benzene, methanol, acetone, tetrahydrofuran (THF) and THF/methanol (1: 3vol/vol) mixed solvent sequentially. The resulting 28 extracts were analyzed with GC/MS. Six organochlorines (OCs) and two organobromines (OBs) were identified in eight extracts from the coals. Our experiments provide, for the first time, the information...
Our results indicate that the gas atmosphere surrounding coal/char particles can greatly affect the formation of NH 3 and HCN through its influence on the availability of H radicals. Based on our results, it is believed that the chemisorption of CO 2 on the nascent char surface can consume H radicals or block the access of N-sites by H radicals for the formation of NH 3 and...
The formation of HCN and NH 3 from the pyrolysis of a small set of Chinese and Australian coals were studied using a novel fluidised-bed/fixed-bed reactor and a fluidised-bed/tubular reactor. The fluidised-bed/fixed-bed reactor has some features of a fluidised-bed reactor and of a fixed-bed reactor, allowing the evaluation of the effects of coal properties on the formation of HCN and NH ...
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