• effect of promoter sio2, tio2 or sio2-tio2 on the performance of cuo-zno-al2o3 catalyst for methanol synthesis from co2 hydrogenation

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the influences of sio2, tio2 or sio2-tio2 promoters on the catalytic performance of cuo-zno-al2o3catalyst in the methanol synthesis from co2 hydrogenation were studied. the catalysts were prepared by co-precipitation method, sio2 and tio2 were loaded by hydrolyzation of tetraethyl orthosilicate (teos) and hydrolyzation of tetra-n-butyl titanate (c16h36o4ti), respectively. the catalytic performances of the prepared catalysts were investigated under conditions of t = 533 k, p = 2.6 mpa, h2:co2 = 3:1 (volume ratio) and sv = 3600 h−1. the experimental results showed that the promoted catalysts showed a higher performance than cuo-zno-al2o3. especially, the one promoted with sio2-tio2 maximized both activity and methanol selectivity with 40.70% in co2 conversion and 41.17% in methanol selectivity as compared to the one without promoter (15.81% in co2 conversion and 23.31% in methanol selectivity). characterizations of xrd, h2-tpr, h2-tpd, nh3-tpd, co2-tpd and sem revealed that all the promoters improved the cuo dispersion in the catalyst body and improved the adsorption/activation of h2 on the catalyst. especially sio2-tio2 exhibited higher performance as compared to sio2 or tio2.

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