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کاتالیزور کاربردی a: عمومی 2012
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همایش ، رویداد ، ژورنال
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  • ubiquitous aluminum alkyls and alkoxides as effective catalysts for glucose to hmf conversion in ionic liquids

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     metal halides (chlorides in particular) are employed almost exclusively as lewis acid catalysts for the homogeneous conversion of glucose (or cellulose) to hmf (5-hydroxymethylfurfural) in ionic liquids (ils), with crcl2 being arguably the most effective benchmark catalyst. reported herein is a discovery that ubiquitous aluminum alkyl or alkoxy compounds are very effective lewis acid catalysts for the glucose-to-hmf conversion in ils. under the current reaction conditions (1-ethyl-3-methylimidazolium chloride [emim]cl, 120 °c, 6 h), simple trialkyl and trialkoxy aluminum species such as alet3 and al(oipr)3, which are much cheaper than crcl2 (by a factor of 5 for alet3 or 180 for al(oipr)3), are at least as effective as crcl2to catalyze this conversion process. the molecular structure of [emim]+[clalme(bht)2]−, formed upon mixing the alkylaryloxy aluminum meal(bht)2 and the il [emim]cl, has been determined by x-ray diffraction; the structure simulates that of the metallate [emim]+[crcl3]−, the proposed active species responsible for the effective glucose to hmf conversion by crcl2 in [emim]cl. another significant finding is that a gradual substitution of the chloride ligand on aluminum by the alkyl ligand brings about a drastic enhancement on the hmf yield, from 1.6% by alcl3 to 7.6% by mealcl2 to 17% by et2alcl and to 51% by alet3, thus showing approximately an overall 32-fold hmf yield enhancement going from alcl3 to alet3.

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