Study on Selective Pyrolysis of Biomass for Production of Upgraded Bio-Oil Xiaoning Ye, Xuejiao Lei, Caixia Wang, Qionghui Li, Wei Yuan and Ziqian Li E3S Web Conf., 118 (2019) 01033 Published online: 04 October 2019 DOI: 10.1051/e3sconf/201911801033