丙酮–乙醇–丁醇混合物向长链酮醇的高选择性转化

Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-09-20

申春 朱强强 王杰 苏海佳 谭天伟

Abstract： Upgrade of acetone–butanol–ethanol (ABE) mixturefrom biomass to high-value biofuelshas aroused an increasing attention. However, reportedheterogeneous catalyst,metal-containing MgAl-hydrotalcite (HT), is confronted with a serious water-resistance problem due to inherent memory effect of HT material. Aimed at exploring catalysts withimproved water-resistance, metal-containing MgO–SiO2catalystsweresynthesizedand evaluated.Investigation on effect of metal typesincluding Ni, Cu, Fe, Zn and Co, metal loading and reaction temperature on catalytic performance indicates that the 10 wt% Ni-MgO–SiO2catalystprovides the best catalytic performance, giving ayield of 81.5 % to C5–C15 ketones and alcohols at 240 °C.As expected, thecatalyst exhibits anexcellent water-resistance. It could tolerate upto 3 wt% water, whichwas much higher than 0.5 wt% overCu- or Pd-HT as reported. Results from XRD and 29Si MAS NMRanalyses indicate that the high water-resistance could be ascribed to the more stable structure of magnesium silicates formed in the catalyst than HT materials. To further study effect of catalyst property on catalytic performance, 10 wt% Ni-SiO2, 10 wt% Ni-MgO, and 10 wt% Ni-MgO–SiO2 catalysts were investigatedand characterized.Results from CO2-TPD, Pyridine-IR and NH3-TPDanalyses reveal that the catalytic performance issignificantly affected by acid–base property. Obtaining a high catalytic performance necessitatesa cooperation of enough acidic sites and basic sites.

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