• direct conversion of glycerol to acrylic acid via integrated dehydration–oxidation bed system

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 958
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     acrylic acid can be successfully produced in a single reactor via subsequent oxidation of the glycerol-dehydrated products. selective dehydration of glycerol to acrolein was studied at 275–400 °c over hzsm-5, hbeta, hmordenite and hy. the v–mo oxides (15–70 mol%v) on silicic acid support (20–100 wt% mixed oxides loading) were then included as a second bed for subsequent oxidation of the dehydrated products. over the acid zeolites, acrolein and acetol are mainly generated, together with acetaldehyde, propionaldehyde, pyruvaldehyde and other oxygenates as secondary products. a complete conversion of glycerol with high selectivity to acrolein (up to 81 mol%) can be obtained when medium pore zeolites (hzsm-5) and low glycerol concentration (10–30 wt%) was used at 300 °c. a separated-sequential bed system provides high selectivity for acrylic acid with small amount of acetic acid and acetaldehyde (∼15 mol%). the catalyst with high v content promotes total oxidation of the dehydrated products to co while that with highly dispersed v–mo–o phases affords 98% selectivity to acrylic acid with 48% acrolein conversion.

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