首页|Enhanced bioethanol-to-ethylene performance over nanosized sheet-like M-SAPO-34(M = Sr and K)catalysts
Enhanced bioethanol-to-ethylene performance over nanosized sheet-like M-SAPO-34(M = Sr and K)catalysts
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Two-dimensional(2D)morphology zeolites nanosheets NS-M-SAPO-34(M = K and Sr)were developed and applied for producing ethylene(C2H4)from bioethanol.Various factors,including SAPO-34 type,temperature,bioethanol concentration,and weight hourly space velocity(WHSV)on C2H4 production were evaluated.The synthesized NS-M-SAPO-34s gave a nanosheet-like morphology with a thickness of 25-50 nm,while the commercial cube-like SAPO-34(CC-SP34)exhibited a cubic-like morphology with a particle size of about 1.5 μm.The specific surface area of the NS-Sr-SAPO-34 was 644 m~2 g~(-1)which was much larger than that of CC-SP34(573 m~2 g~(-1)).The catalytic performance evaluated by bioethanol dehydration reaction showed that NS-Sr-SAPO-34 exhibited significant improvements not only in suppressed coke deposition(5.6%)and prolonged lifetime(913 min)but also in higher C2H4 yield(94.5%)compared with those(11.8%,160 min and 82.4%,respectively)of CC-SP34,which can be attributed to the shortened diffusion path length,highly accessible active centers and suitable medium-strong acidity.Elevated temperature,high bioethanol concentration and decreased WHSV tended to enhance the C2H4 yield,while decreased bioethanol concentration was propitious to suppress coking rate.An optimal C2H4 yield of 100% was obtained at 350 ℃ with a bioethanol concentration from nutrient broths(15 vol%,WHSV = 0.75 h~(-1)).
BiomassBioethanol to ethyleneTwo-dimensional materialsSAPO-34 zeolite nanosheetModification
Jingang Yao、Saisai Liu、Guanyi Chen
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School of Agricultural Engineering and Food Science,Shandong Research Center of Engineering & Technology for Clean Energy,Shandong University of Technology,Zibo,255000,China
School of Environmental Science and Engineering,Tianjin University,Tianjin,300072,China
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