双金属催化剂对煤焦油模型化合物催化裂解行为的影响
发布时间:2018-05-07 02:01
本文选题:双金属催化剂 + 模型化合物 ; 参考:《化工学报》2017年10期
【摘要】:以Al_2O_3为载体,Ce、Co和Fe为助剂,采用机械化学法制备了4种镍基催化剂,对其进行了XRD、H_2-TPR、BET、NH_3-TPD等表征。当载气流量为50 ml·min~(-1),裂解温度为750℃时,在固定床反应器中考察了各催化剂对煤焦油模型化合物甲苯+芘裂解行为的影响。结果表明:4种催化剂均为介孔催化剂,且双金属催化剂的介孔有序度更高;催化剂中活性组分Ni主要以尖晶石NiAl_2O_4的形式存在;添加Fe助剂后,催化剂的酸强度较Ni/Al_2O_3增加,添加Ce和Co时则相反。评价实验表明,助剂对重质组分芘的裂解率影响较小,约为67%,然而Ce和Co对催化剂的抗积炭性能有利,其析碳分别较无助剂时降低28.8%和18.0%。
[Abstract]:Four kinds of nickel based catalysts were prepared by mechanochemical method using Al_2O_3 as carrier CeCe Co and Fe as auxiliaries. The catalysts were characterized by XRDX H2-TPRB et al. When the carrier gas flow rate was 50ml / min ~ (-1) and the pyrolysis temperature was 750 鈩,
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