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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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  • aqueous-phase dehydration of xylose to furfural in the presence of mcm-22 and itq-2 solid acid catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1192
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    • شماره تماس دبیرخانه رویداد: -
     the h-mcm-22 zeolite possessing an mww (medium-pore) framework and its delaminated counterpart, itq-2, with enhanced external surface area, are effective and recyclable solid acid catalysts in the batch-wise, aqueous-phase dehydration of xylose, at 170 °c. up to 71% furfural (fur) yield is reached at 98% conversion using a biphasic aqueous–organic solvent system (for the simultaneous extraction of fur); using solely water as the solvent gives up to 54% fur yield at 97% conversion. sulfuric acid, used in an approximately equivalent amount to the total acid site concentration of the solid acids, gave 55% fur yield at 93% conversion. decreasing the si/al ratio of h-mcm-22 zeolite improves the acid properties and consequently the catalytic activity, without affecting significantly the fur selectivity. while the delamination process considerably enhanced the external surface area of itq-2 in comparison to h-mcm-22, it caused modifications in the acid properties, leaving the two prepared materials with the same si/al atomic ratio of 24, on a comparable footing in terms of catalytic performance in the studied catalytic reaction. nevertheless, these solid acid catalysts are fairly stable (similar fur yields are reached in recycling runs; no structural modifications and no leaching phenomena were detected).

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