Comparative study of microwave-assisted versus conventional heated reactions of biomass conversion into levulinic acid over hierarchical Mn_(3)O_(4)/ZSM-5 zeolite catalysts  

作　　者：Mazizah R.A.Helmi Dyah Utami C.Rahayu Arnia P.Pratama Irena Khatrin Anita N.Ramadhani Yuni K.Krisnandi 

机构地区：[1]Department of Chemistry,Faculty of Mathematics and Natural Science,Universitas Indonesia,Depok 16424,Indonesia [2]Solid Inorganic Framework Laboratory,Department of Chemistry,Faculty of Mathematics and Natural Science,Universitas Indonesia,Depok 16424,Indonesia

出　　处：《Carbon Resources Conversion》2023年第3期245-252,共8页碳资源转化（英文）

基　　金：funded by BOPTN Research Fund number NKB-322/UN2.RST/HKP.05.00/2021 from the Ministry of Research and Technology Indonesia.

摘　　要：Conversion of delignified cellulose from rice husk biomass,and model compounds of cellobiose and glucose to levulinic acid(LA)over hierarchical Mn_(3)O_(4)/ZSM-5 catalyst was carried out using a household microwave method,and then compared to the established conventional thermos-reaction method.The hierarchical ZSM-5 was prepared using a double template method,aiming for micro and mesoporous systems developed in the structure.The as-prepared ZSM-5 were modified with Mn3O4 through incipient wetness impregnation with Mn2+solution followed by calcination at 550℃.The catalysts were characterized using various techniques such as powder XRD,SEM,BET,AAS,and FT-IR which indicated the hierarchical structure of MFI zeolite(Si/Al of 30-34)with Mn loading of 2.14 wt%.The conversion products were analyzed using HPLC,1H NMR,and 13C NMR instruments.The microwave-assisted reaction using 600 W for 180 s using delignified cellulose,cellobiose,and glucose gave conversion of 37.27%,46.35%,and 54.29%,respectively which is close to the conversion given by the conventional reaction carried out at 130◦C for 4 h(36.75%,55.62%,and 60.9%,respectively).Interestingly,the LA yield from the microwave-assisted reaction(4.33%,6.12%,and 9.57%)is higher than the yield from the conventional reaction,which only produced 5.2%,4.88%,and 6.93%respectively.The microwaveassisted method is also shown to give less by-products compared to the thermochemical reaction.Therefore,it could be considered an alternative method for converting cellulose to LA.

关 键 词：Hierarchical ZSM-5 zeolite Levulinic acid Lignocellulose conversion Microwave-assisted synthesis CELLOBIOSE GLUCOSE 

分 类 号：O64[理学—物理化学]