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Hydrogen spillover-enhanced Heterogeneously Catalyzed Hydrodeoxygenation for biomass upgrading.

Hydrodeoxygenation (HDO) is regarded as a promising technology for biomass upgrading to obtain sustainable and competitive chemicals and fuels. In fact, biomass HDO over heterogeneous solid catalysts is often accompanied by the phenomenon of hydrogen spillover, which further affects the catalytic performance. Thus, it is necessary to in-depth understand the promoting effect of hydrogen spillover in the biomass HDO process to obtain desired conversion and selectivity. This review summarizes the extensive research on hydrogen spillover in biomass refining and discusses in detail the regulation mechanism of hydrogen spillover in biomass HDO process, mainly by regulating different active center sites on catalyst supports, such as metal sites, acid sites, surface functional groups and defective sites, which exhibit independent and synergistic characteristics promoting catalyst activity, selectivity and stability. Finally, we critically evaluate the prospective of hydrogen spillover in biomass HDO applications and highlight the key technical challenges in developing "hydrogen-free" HDO and upgrading biofuels. The presentation of hydrogen spillover-enhanced catalytic biomass HDO in this review will hopefully provide insight and guidance for further development of efficient catalysts and preparation of high value chemicals in the future.