Lignin and plastics are two of the most extensively used polymeric materials in contemporary industrial systems.As a biomass-derived polymer containing abundant aromatic units,lignin has emerged as a prime candidate f...Lignin and plastics are two of the most extensively used polymeric materials in contemporary industrial systems.As a biomass-derived polymer containing abundant aromatic units,lignin has emerged as a prime candidate for replacing fossil fuels owing to its renewable nature.Paradoxically,as synthetic polymer materials with aromatic structures similar to those of lignin,plastics have become a critical environmental challenge owing to their accumulation over recent decades.The inherent stabilities of lignin and plastics pose significant challenges for their efficient utilization and recycling,making catalytic depolymerization a focal research point in recent years.Innovative catalytic strategies that enable the high-yield production of aromatic compounds through the catalytic hydroprocessing of lignin and plastic waste have recently emerged.These methods offer opportunities for the conversion of recalcitrant polymers into valuable chemicals and sustainable fuels.This paper comprehensively reviews these advancements and emphasizes their potential applications in catalytic hydroprocessing for biofuel production.Additionally,it highlights the latest developments in the high-value upgrading of lignin derivatives and underscores their significance in building a sustainable chemical industry.The review examines the entire value chain from lignin and plastic depolymerization to the production of high-value chemicals to outline the potential for enhancing the efficiency of sustainable processes.This emphasizes the critical role of developing novel cost-effective methodologies for the catalytic depolymerization of lignin and plastic waste.These advancements are expected to play a pivotal role in fostering a sustainable economy and addressing pressing environmental challenges.展开更多
To understand the catalytic conversion of lignin into high-value products,lignin depolymerization was performed using a layered polymetallic oxide(CuMgAlO_(x))catalyst.The effects of the conversion temperature,hydroge...To understand the catalytic conversion of lignin into high-value products,lignin depolymerization was performed using a layered polymetallic oxide(CuMgAlO_(x))catalyst.The effects of the conversion temperature,hydrogen pressure,and reaction time were studied,and the ability of CuMgAlO_(x)to break the C–O bond was evaluated.The CuMgAlO_(x)(Mg/Al=3:1)catalyst contained acidic sites and had a relatively homogeneous elemental distribution with a high pore size and specific surface area.Theβ-O-4 was almost completely converted by disassociating the C–O bond,resulting in yields of 14.74%ethylbenzene,47.58%α-methylphenyl ethanol,and 36.43%phenol.The highest yield of lignin-derived monophenols was 85.16%under reaction conditions of 280℃ and 3 Mpa for 4 h.As the reaction progressed,depolymerization and condensation reactions occurred simultaneously.Higher temperatures(>280℃)and pressures(>3 Mpa)tended to produce solid char.This study establishes guidelines for the high-value application of industrial lignin in the catalytic conversion of polymetallic oxides.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.22472030,21902027,and 21774059)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX20-0861)+1 种基金the China Scholarship Council(CSC)the opening funding of the Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals.
文摘Lignin and plastics are two of the most extensively used polymeric materials in contemporary industrial systems.As a biomass-derived polymer containing abundant aromatic units,lignin has emerged as a prime candidate for replacing fossil fuels owing to its renewable nature.Paradoxically,as synthetic polymer materials with aromatic structures similar to those of lignin,plastics have become a critical environmental challenge owing to their accumulation over recent decades.The inherent stabilities of lignin and plastics pose significant challenges for their efficient utilization and recycling,making catalytic depolymerization a focal research point in recent years.Innovative catalytic strategies that enable the high-yield production of aromatic compounds through the catalytic hydroprocessing of lignin and plastic waste have recently emerged.These methods offer opportunities for the conversion of recalcitrant polymers into valuable chemicals and sustainable fuels.This paper comprehensively reviews these advancements and emphasizes their potential applications in catalytic hydroprocessing for biofuel production.Additionally,it highlights the latest developments in the high-value upgrading of lignin derivatives and underscores their significance in building a sustainable chemical industry.The review examines the entire value chain from lignin and plastic depolymerization to the production of high-value chemicals to outline the potential for enhancing the efficiency of sustainable processes.This emphasizes the critical role of developing novel cost-effective methodologies for the catalytic depolymerization of lignin and plastic waste.These advancements are expected to play a pivotal role in fostering a sustainable economy and addressing pressing environmental challenges.
基金supported by the National Natural Science Fund for Distinguished Young Scholars(52125601).
文摘To understand the catalytic conversion of lignin into high-value products,lignin depolymerization was performed using a layered polymetallic oxide(CuMgAlO_(x))catalyst.The effects of the conversion temperature,hydrogen pressure,and reaction time were studied,and the ability of CuMgAlO_(x)to break the C–O bond was evaluated.The CuMgAlO_(x)(Mg/Al=3:1)catalyst contained acidic sites and had a relatively homogeneous elemental distribution with a high pore size and specific surface area.Theβ-O-4 was almost completely converted by disassociating the C–O bond,resulting in yields of 14.74%ethylbenzene,47.58%α-methylphenyl ethanol,and 36.43%phenol.The highest yield of lignin-derived monophenols was 85.16%under reaction conditions of 280℃ and 3 Mpa for 4 h.As the reaction progressed,depolymerization and condensation reactions occurred simultaneously.Higher temperatures(>280℃)and pressures(>3 Mpa)tended to produce solid char.This study establishes guidelines for the high-value application of industrial lignin in the catalytic conversion of polymetallic oxides.
