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  • direct conversion of cellulose into polyols over ni/w/sio2-al2o3

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 558
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the direct conversion of cellulose into polyols over ni/w/sio2-al2o3 catalysts with different al molar fractions was examined. for comparison, cu/w/sio2-al2o3, fe/w/sio2-al2o3, and co/w/sio2-al2o3 were also evaluated. the bulk crystalline structure was determined using x-ray diffraction (xrd). the surface acidity was probed via temperature-programmed desorption of ammonia (nh3-tpd). the textural properties were investigated using n2 physisorption. the metal contents were confirmed via inductively coupled plasma–atomic emission spectroscopy (icp-aes). among the various metal catalysts, ni/w/sio2-al2o3 was confirmed to be the most favorable for hydrogenolysis of cellulose into polyols. the effect of the al molar fraction in sio2-al2o3on this reaction over ni/w/sio2-al2o3 was also investigated. it was found that the polyol yield was closely related to the total acidity of the support. compared to ni/w/sba-15, ni/w/sio2-al2o3 (al/(al + si) = 0.6) showed better stability during the recycling test. the catalyst deactivation was confirmed to be caused by metal leaching.

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