Comparative study of microwave-assisted versus conventional heated reactions of biomass conversion into levulinic acid over hierarchical Mn3O4/ZSM-5 zeolite catalysts

IF 6.4 3区 环境科学与生态学 Q2 ENERGY & FUELS
Mazizah R.A. Helmi , Dyah Utami C. Rahayu , Arnia P. Pratama , Irena Khatrin , Anita N. Ramadhani , Yuni K. Krisnandi
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Abstract

Conversion of delignified cellulose from rice husk biomass, and model compounds of cellobiose and glucose to levulinic acid (LA) over hierarchical Mn3O4/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 °C. 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 microwave-assisted 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.

在Mn3O4/ZSM-5沸石分级催化剂上微波辅助与常规加热生物质转化为乙酰丙酸的比较研究
采用家用微波法,在分级Mn3O4/ZSM-5催化剂上,从稻壳生物质、纤维二糖和葡萄糖模型化合物中脱木素纤维素转化为乙酰丙酸(LA),并与传统的热反应方法进行了比较。采用双模板法制备了分级ZSM-5,旨在开发该结构中的微米和介孔体系。通过用Mn2+溶液初湿浸渍,然后在550°C下煅烧,用Mn3O4对所制备的ZSM-5进行改性。使用粉末XRD、SEM、BET、AAS和FT-IR等各种技术对催化剂进行了表征,表明Mn负载量为2.14wt%的MFI沸石(Si/Al为30–34)的分级结构。使用HPLC、1H NMR和13C NMR仪器分析转化产物。使用600 W的微波辅助反应180 s,使用脱木素纤维素、纤维二糖和葡萄糖,转化率分别为37.27%、46.35%和54.29%,这与在130°C下进行4小时的常规反应所给出的转化率(分别为36.75%、55.62%和60.9%)接近。有趣的是,微波辅助反应的LA产率(4.33%、6.12%和9.57%)高于常规反应的产率,后者分别仅产生5.2%、4.88%和6.93%。与热化学反应相比,微波辅助方法也显示出更少的副产物。因此,它可以被认为是将纤维素转化为LA的一种替代方法。
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来源期刊
Carbon Resources Conversion
Carbon Resources Conversion Materials Science-Materials Science (miscellaneous)
CiteScore
9.90
自引率
11.70%
发文量
36
审稿时长
10 weeks
期刊介绍: Carbon Resources Conversion (CRC) publishes fundamental studies and industrial developments regarding relevant technologies aiming for the clean, efficient, value-added, and low-carbon utilization of carbon-containing resources as fuel for energy and as feedstock for materials or chemicals from, for example, fossil fuels, biomass, syngas, CO2, hydrocarbons, and organic wastes via physical, thermal, chemical, biological, and other technical methods. CRC also publishes scientific and engineering studies on resource characterization and pretreatment, carbon material innovation and production, clean technologies related to carbon resource conversion and utilization, and various process-supporting technologies, including on-line or off-line measurement and monitoring, modeling, simulations focused on safe and efficient process operation and control, and process and equipment optimization.
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