1. Key Laboratory of Catalysis Science and Technology of Chongqing Education Commission Department of Chemical and Engineering Chongqing Technology and Business University Chongqing 400067 P. R. China
2. Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of Education Chongqing Technology and Business University Chongqing 400067 P. R. China
3. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education Hubei Province South-Central University for Nationalities Wuhan 430074 P. R. China