Hydrogen, as a promising energy carrier, can be extracted from renewable biomass derived acetic acid (HAc). Ni-based catalysts supported on solid solution of Sm2-xPrxO3±δ were prepared using coprecipitation method and evaluated in auto-thermal reforming (ATR) of HAc for hydrogen production. The results revealed that Pr species infiltrated the Sm2O3 lattice and formed a solid solution structure with oxygen vacancy defects, in which redox process of Sm3++Pr3+⇌Sm2++Pr4+ enhanced oxygen mobility, facilitating gasification of coking precursor and suppressing carbon deposition. DFT analysis also confirmed that Pr doping into the Sm2-xPrxO3±δ solid solution significantly lowered the energy barrier by 112 kJ/mol for formation of oxygen vacancies. Additionally, the interaction between Ni0 and Sm2-xPrxO3±δ effectively improved the dispersion of Ni0 metal particles, inhibiting sintering of Ni species. Consequently, the NSP10 catalyst (Ni0.80Sm1.72Pr0.24O3.74±δ) exhibited outstanding catalytic performance for hydrogen production: the conversion of HAc approached 100%, while the hydrogen yield remained stable at 2.75 mol-H2/mol-HAc.

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