Pyrolysis oil production from polypropylene plastic waste using molybdenum modified alumina-silica catalystsSasiradee Jantasee, Natacha Phetyim, Komm Petchinthorn, Tunyahpat Thanupongmanee and Nuntiporn SripiromE3S Web Conf., 122 (2019) 01005DOI: https://doi.org/10.1051/e3sconf/201912201005