LAUSR

Chinese long flame coal named Naomaohu was pyrolyzed at 600 °C under hydrogen pressures of 0.1–3.0 MPa. The resultant chars were gasified at 900 °C under carbon dioxide to illustrate the correlations between structure and reactivity of pyrolyzed chars. For comparison, experiments under the same conditions in the nitrogen atmosphere were also conducted. The char yield decreased markedly with increasing hydrogen pressure, whereas the char yield under nitrogen stayed constant regardless of nitrogen pressure, being certainly larger than that of hydropyrolysis. The structure of chars was analyzed by Raman spectroscopy and X-ray diffraction, which informed that more content of larger aromatic sheets and higher graphitic order was found, respectively, in the char pyrolyzed under higher pressures. Hydropyrolysis certainly led to more content of larger aromatic sheets and higher graphitic order in its char than those of chars pyrolyzed under the nitrogen atmosphere. The gasification reactivity of hydropyrolyzed ch...