Herein, the catalyst deactivation and improvement of conversion efficiency in transforming real lignin into fuels was studied. Unlike model compounds, real lignin shows strong poisonous effect to catalyst, leading to fast deactivation at the beginning of reaction. We revealed that the heavy carbonaceous deposit on the surface of catalyst was responsible for the fast deactivation encountered in the conventional one-step reaction process. Moreover, the ester structures in lignin, which were always neglected in researches, were confirmed to be another key factor for deactivation due to easier polymerization. Based on these points, we developed a three-steps method which includes depolymerization of lignin, extraction of monomers and HDO of monomers, to eliminate the serious deactivation of catalyst. The results showed that the production for fuels were 9 to 24 time more efficient than the one-step batch reaction. Moreover, many techniques could be applied in the three-steps strategy to make it more potential to be used in commercial production.

Study on catalyst deactivation in transforming lignin to fuels and the improvement of conversion efficiency

ACS Fall 2020 Virtual Meeting

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