Abstract
In this study, the catalytic activity and selectivity of Fe-Ca/SiO2 catalyst systems for light hydrocarbon liquids (HCL) and gaseous products (GPs) were investigated in a fixed-bed reactor at N2 pressure 0.1 MPa, temperature 600–750 °C. A series of Fe-Ca/SiO2 catalysts were synthesized, characterized and evaluated for the oxygen transfer. The catalytic pyrolysis of biomass with catalysts (Fe/SiO2, Ca/SiO2, Fe-Ca/SiO2) was studied to identify the selective deoxygenation. With the addition of Fe/SiO2 catalyst, the oxygen was crucially removed in the form of CO2, and with Ca/SiO2 catalyst, more oxygen was removed in the form of H2O. In addition, the hydrogen content with Fe-Ca/SiO2 catalyst was higher than that of raw biomass. The hydrogen with Fe-Ca/SiO2 increased from 57.41 ml/g to 109.04 ml/g. It also effectively improved the aromatics in bio-oil with the addition of Fe-Ca/SiO2 catalyst during the pyrolysis process. It was found that the addition of Ca remarkable promoted the catalytic activity of Fe catalyst due to forming Ca2Fe2O5. A possible mechanism was proposed to be responsible for the high catalytic activity and deoxygenation in Fe-Ca/SiO2 catalyst systems.
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