リグニン優先触媒分解と微生物アップグレードを組み合わせたハイブリッドリグニン変換プロセスの開発
Chemical lignin depolymerization typically yields a heterogeneous mixture of breakdown products. This study constructed a hybrid conversion scheme pairing reductive catalytic fractionation (RCF) of poplar biomass using a Pd/C catalyst with subsequent cultivation of Rhodococcus opacus PD630 on the resulting lignin breakdown products (LBPs). Compared with base-catalyzed depolymerization performed without Pd/C or molecular hydrogen, RCF-derived LBPs supported greater cell biomass accumulation per gram of feedstock. Residual cellulose after RCF exhibited enzymatic digestibility exceeding 40% saccharification yield. Techno-economic and life cycle analyses, modeled within a cellulosic bioethanol facility, showed a reduction in the minimum ethanol selling price from $4.07 to $3.94 per gallon, with global warming potentials between 29 and 30.5 CO2eq/MJ. The findings support the feasibility of an industrial biorefinery integrating lignin-first catalytic deconstruction with microbial valorization.
RCF using Pd/C and molecular hydrogen modifies the composition of lignin breakdown products, improving their assimilability by R. opacus PD630 and simultaneously enhancing enzymatic saccharification of residual cellulose in the treated biomass.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/39648819