Hydrogen-rich syngas production by the three-dimensional structure of LaNiO3 catalyst from a blend of acetic acid and acetone as a bio-oil model compound

Abstract

Converting biomass bio-oil to hydrogen is valuable strategy. In this study, a blend of acetic acid and acetone has been utilized as a bio-oil model compound, where perovskite in a three-dimensional structure (3D-LaNiO 3 ) synthesized by a silica template method used as a catalyst. The result shows that the main phase of perovskite at 3D-LaNiO 3 catalyst has lower crystal size, resulting in decrease possibility of agglomeration. The amount of oxygen vacancies and higher ratio of Ni 3+ /Ni 2+ are produced, enhancing the redox of catalyst. The stronger basic site and lager surface indicated the ability of improving coke deposition resistance. These results explained great activity of 3D-LaNiO 3 catalyst in producing hydrogen-rich syngas. The different steam/carbon mole ratios (S/C) have been discussed at 1 to 4, and the gas yield of H 2 (93.5%) shows highest at 600 °C and S/C = 3. Meanwhile, under this condition, the H 2 gas yield was stable and over 90% throughout 15 h of reaction. By analysis of spent 3D-LaNiO 3 catalyst, the result indicated that it has ability to resist the production of graphite coke deposition which is one of reasons for keeping catalyst activity. On the other hand, the stable of perovskite structure help in produce lattice oxygen for oxidizing coke deposited. • Acetic acid and acetone as a bio-oil model compound has been used for H 2 production. • Three-structure of LaNiO 3 has been used as a catalyst and compared with LaNiO 3 . • Three-structure of LaNiO 3 catalyst showed better catalytic performance. • The key factors of the high catalytic activity are oxygen vacancies, crystal size, coke deposition resistance. • Over 90% H 2 yield achieved with three structure -LaNiO 3 catalyst throughout 15 h.