1. School of Chemical Engineering Northwest University, Taibai North Road 229 Xi'an Shaanxi 710069 China
2. Chemical Engineering Research Center Ministry of Education for Advanced Use Technology of Shanbei Energy, Taibai North Road 229 Xi'an Shaanxi 710069 China
3. Shaanxi Research Center Engineering Technology for Clean Coal Conversion, Taibai North Road 229 Xi'an Shaanxi 710069 China