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Preparation of NiCu/SAPO-11 by citric-acid modification and its hydrogenation performance
Author(s): 
Pages: 821-828
Year: Issue:  5
Journal: Journal of Chemical Engineering of Chinese Universities

Keyword:  柠檬酸改性磷酸分子筛(SAPO-11)正十六烷临氢异构;
Abstract: 为了研究柠檬酸对NiCu/SAPO-11催化剂的结构和临氢异构性能影响,通过柠檬酸改性制备一系列的NiCu/SAPO-11催化剂.采用X射线衍射(XRD)、N2吸附-脱附、NH3程序升温脱附(NH3-TPD)、透射电子显微镜(TEM)和氢气程序升温还原(H2-TPR)等技术对催化剂进行表征.以正十六烷(n-C16)为模型化合物,研究催化剂在固定床反应器中的临氢异构性能.结果表明,柠檬酸改性可以增强金属的分散性,可以使催化剂具有更大的比表面积和孔体积,暴露出更多的酸性位点,从而增加催化剂的催化活性.在温度为340℃、空速为1.5 h-1、压力为1.5 MPa、氢气和n-C16体积比V(H2):V(n-C16)为1000的条件下,正十六烷的转化率,异构十六烷(i-C16)的选择性和收率分别为95.67%,94.89%和90.78%.
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