“…In our previous studies, we have reported that compared to CaO catalyst, the Fe/CaO catalysts showed higher activity in upgrading the biomass fast pyrolysis vapors, and the Fe/CaO catalyst prepared by the impregnation method was more effective in reducing the oxygenated compounds than the catalyst produced by the mechanical mixing method [15,16]. However, the effects of Fe contents on fast pyrolysis of biomass with Fe/CaO catalysts have not been researched.…”