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کاتالیزور کاربردی a: عمومی 2012
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  • synthesis of hybrid sba-15 functionalized with molybdophosphoric acid as efficient catalyst for glycerol esterification to fuel additives

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     fibrous mesoporous hybrid silica (sbah-15) with mesopore diameter of 70 å was synthesized using pluronic p123 (eo20po70eo20) as surfactant, with brij s100 as nonionic co-surfactant. series of catalysts with different molybdophosphoric acid (mpa) loading (5–25%) were synthesized by the thermal decomposition of mpa species in the lattice of sbah-15. catalysts calcined at 560 °c undergone a thermal decomposition of mpa resulted in the formation of β-moo3 active species. the effectiveness of the hybrid support was evaluated by comparison with analogous catalyst prepared by incorporating mpa into the framework of classical sba-15. the catalytic performance of the prepared acid catalysts was examined during glycerol esterification with acetic acid. mono-, di- and triacetyl glycerol (mag, dag and tag, respectively) were the esterification reaction products. sbah-15(15) catalyst, with 15 wt.% mpa loading, exhibited an excellent activity during this reaction, indicated by the complete glycerol conversion (after 1 h) with a corresponding combined selectivity of 86% toward both dag and tag. the best reaction conditions are: reaction temperature of 110 °c, glycerol to acetic acid molar ratio of 1:6 and reaction time of 3 h. the sbah-15(15) catalyst demonstrated good stability in activity upon recycling for four times.

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