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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • dried chitosan-gels as organocatalysts for the production of biomass-derived platform chemicals

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1147
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    • شماره تماس دبیرخانه رویداد: -
     aldol condensations between sugar-derived dehydrated aldehydes (e.g. furfural) and acetone have been proposed as a route to provide useful biomass-derived chemicals. in the quest of sustainable catalytic ways for such aldol condensations, this paper assesses the use of dried chitosan-gels as naturally-immobilized, readily available and non-hazardous amino-based organocatalysts. at room temperature chitosan dried gels are not suitable catalysts for the desired reaction. however, at higher temperatures (>90 °c) reaction proceeds efficiently either in solvent-free systems (with addition of catalytic amounts of water) or in water. the set-up of closed reactor set-ups (thermoshakers or microwave reactions) proved highly beneficial for the reaction outcome. furthermore, chitosan dried gels were successfully re-used for a number of cycles. an efficient catalyst drying method (either lyophilization or scco2 drying) was crucial to achieve virtually full conversions in 4 h. after pertinent further process optimization, dried chitosan-gels may become very useful catalysts for their use in biomass-based reactions in biorefineries.

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