Project supported by the National Natural Science Foundation of China No.21003150,the Natural Science Foundation of Shanxi Province No.2011011006-2 and Independent Research Foundation of the State Key Laboratory of Coal Conversion No.2011BWZ011.项目受国家自然科学基金No.21003150、山西省自然科学基金No.2011011006-2和煤转化国家重点实验室自主研究项目No.2011BWZ011资助.