Lignin,which is the most recalcitrant component of lignocellulosic biomass,is also the most abundant renewable aromatic resource.Herein,reductive treatment of triploid poplar sawdust by the integration of catalytic Ru...Lignin,which is the most recalcitrant component of lignocellulosic biomass,is also the most abundant renewable aromatic resource.Herein,reductive treatment of triploid poplar sawdust by the integration of catalytic Ru/C and a base,which afforded high yields of phenolic monomers from the lignin component and a solid carbohydrate pulp,is reported.The introduction of Cs_(2)CO_(3) led to the generation of C2 side‐chained phenols through the cleavage of C_(β)–O and C_(β)–C_(γ) bonds inβ–O–4 units in addition to C3 side‐chained phenols;the relationship between C2 and C3 was dependent on the base dosage.The reaction conditions,including base species,temperature,time,and H_(2) pressure,were optimized in terms of phenolic product distribution,delignification degree,and carbohydrate retention.The carbohydrate pulps generated from reductive catalytic fractionation in the presence of Cs_(2)CO_(3) were more amenable to enzymatic hydrolysis,indicating that this treatment of biomass constituted the fractionation of biomass components together with the breakdown of biomass recalcitrance.展开更多
Recently,the continuous tube-in-tube reactor based on the Teflon AF membrane is emerging as a powerful toolkit for accelerating gas-liquid mass transfer and reaction rate.Because of its large gas-liquid interfacial ar...Recently,the continuous tube-in-tube reactor based on the Teflon AF membrane is emerging as a powerful toolkit for accelerating gas-liquid mass transfer and reaction rate.Because of its large gas-liquid interfacial area and short mass transfer distance,the reactor can allow a fast gas-liquid mass transfer without direct contact between gas and liquid phases,offering an efficient and safe platform for implementing gas-liquid reaction and rapid determination of gas-liquid parameters.In this review,a detailed description and construction method of this reactor are pro-vided.Then,the recent advancements of the tube-in-tube reactor in fundamental studies and practical applica-tions in gas-involved chemical reactions and biosynthetic processes are discussed.Finally,a perspective on future potential applications of such flow reactors is provided.展开更多
文摘Lignin,which is the most recalcitrant component of lignocellulosic biomass,is also the most abundant renewable aromatic resource.Herein,reductive treatment of triploid poplar sawdust by the integration of catalytic Ru/C and a base,which afforded high yields of phenolic monomers from the lignin component and a solid carbohydrate pulp,is reported.The introduction of Cs_(2)CO_(3) led to the generation of C2 side‐chained phenols through the cleavage of C_(β)–O and C_(β)–C_(γ) bonds inβ–O–4 units in addition to C3 side‐chained phenols;the relationship between C2 and C3 was dependent on the base dosage.The reaction conditions,including base species,temperature,time,and H_(2) pressure,were optimized in terms of phenolic product distribution,delignification degree,and carbohydrate retention.The carbohydrate pulps generated from reductive catalytic fractionation in the presence of Cs_(2)CO_(3) were more amenable to enzymatic hydrolysis,indicating that this treatment of biomass constituted the fractionation of biomass components together with the breakdown of biomass recalcitrance.
基金We gratefully acknowledge the supports of National Key Research and Development Program of China(2019YFA0905100)Tsinghua-Foshan Innovation Special Fund(2021THFS0214)the National Natural Science Foundation of China(21978146,22022809)on this work.
文摘Recently,the continuous tube-in-tube reactor based on the Teflon AF membrane is emerging as a powerful toolkit for accelerating gas-liquid mass transfer and reaction rate.Because of its large gas-liquid interfacial area and short mass transfer distance,the reactor can allow a fast gas-liquid mass transfer without direct contact between gas and liquid phases,offering an efficient and safe platform for implementing gas-liquid reaction and rapid determination of gas-liquid parameters.In this review,a detailed description and construction method of this reactor are pro-vided.Then,the recent advancements of the tube-in-tube reactor in fundamental studies and practical applica-tions in gas-involved chemical reactions and biosynthetic processes are discussed.Finally,a perspective on future potential applications of such flow reactors is provided.
