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فناوری منابع زیستی
جزئیات رویداد
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  • catalytic etherification of glycerol to produce biofuels over novel spherical silica supported hyflon® catalysts

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 754
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     etherification of glycerol (gly) with isobutylene (ib) to produce biofuels was investigated in liquid phase using spherical silica supported hyflon® catalysts (sshc). as reference catalyst, amberlyst® 15 (a-15) acid ion-exchange resin was used. experiments were carried out in batch mode at a reaction temperature ranging from 323 to 343 k. sshc were found to be very effective systems in etherification of glycerol with ib, providing cumulative di- and tri-ethers yields higher than that obtained by using a-15 catalyst. furthermore, such catalysts were stable and easily reusable; no leaching of active phase was observed. the formation of poly-substituted ethers, suitable additives for conventional fuels, was favored by operating at an isobutylene/glycerol molar ratio >3 and low reaction time (<6 h); however, the concentration of mono-ether reached values lower than 3 wt.% only when sshc catalyst was used. turnover frequency of glycerol (tofgly) highlighted that sshc systems were much more active than a-15 catalyst: the accessibility and nature of active sites and the surface properties of catalysts were indicated as the main factors affecting the catalytic behavior. a lower acid site density of sshc than that of a-15 catalyst was decisive in preventing the occurrence of oligomerization reaction which leads to the formation of di-isobutylene (dib), precursors of gummy products.

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