Bio-oil and biochar production using thermal and catalytic pyrolysis of low-value waste neem seeds over low-cost catalysts:effects of operating conditions on product yields and studies of physicochemical characteristics of bio-oil and biochar

作     者：Ranjeet Kumar Mishra Kaustubha Mohanty 

作者机构：Department of Chemical EngineeringIndian Institute of Technology GuwahatiGuwahati 781039India 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2021年第3卷第4期

页      面：641-656页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0901[农学-作物学] 0703[理学-化学] 

基　　金：Department of Chemical Engineering for GC-MS Indian Institute of Technology Guwahati, IITG 

主　　题：Waste neem seeds Pyrolysis Catalysts Bio-fuel GC–MS FTIR 1H NMR Biochar FESEM 

摘      要：This study addressed a comparative assessment of the effect of low-cost catalysts on the yield and physicochemical properties of *** and catalytic pyrolysis of neem seeds(NM)was conducted in a fixed bed semi-batch reactor at optimum conditions(550°C temperature,80°C min−1 heating rate,0.5 mm particle size,and 100 mL min−1 sweep gas flow rate).The produced bio-oil and biochar were characterized through thermal stability,elemental composition(CHNS),higher heating value(HHV),Nuclear Magnetic Resonance(NMR)spectroscopy,Field Emission Scanning Electron Microscopy(FESEM),Fourier-transform infrared spectroscopy(FTIR),Gas Chromatography-Mass Spectrometry(GC-MS),zeta potential,water-holding capacity(WHC),and BET(Brunauer,Emmett and Teller)surface area ***,it was noticed that the use of catalysts at optimized condition substantially boosted the quality and yield of *** results established that thermal pyrolysis yielded 49.53 wt.%of bio-oil,while catalytic pyrolysis yielded(51.25 wt.%,53.12 wt.%,48.68 wt.%,and 50.65 wt.%for MgO,NaOH,Al_(2)O_(3),and ZSM-5,respectively)at 20 wt.%catalyst *** physicochemical study of bio-oil confirmed improved properties of bio-oil in terms of viscosity,heating value,pH and carbon ***,the FTIR study of bio-oil indicates the occurrence of phenolic products,aromatics,ketones,acidic compounds,esters,alcohol and aldehyde impurities,whereas 1H NMR study supported FTIR ***-MS study demonstrated that the introduc-tion of catalysts significantly reduced the oxygenated substances,acidic products,phenolic compounds and substantially increased the ***,characterization results of neem seed biochar(NMC)established the existence of HHV(23.26 MJ kg^(−1)),carbon content(62.66%),zeta potential(31.68 mV),water holding capacity(41.50%)and lower BET surface area(4.60 m^(2)g^(−1)).