苯加氢烷基化制备环己基苯催化剂的研制及其应用
发布时间：2018-10-25 07:39
【摘要】：以β分子筛为载体采用等体积浸渍法制备双功能复合催化剂,并用于苯加氢烷基化制备环己基苯的反应。采用X射线粉末衍射(XRD)、氮气吸附脱附(BET)、程序升温脱附(TPD)及高分辨透射电子显微镜(HR-TEM)对催化剂组分间的协同催化作用进行考察。并在固定床反应装置上评价了所制备的催化剂活性和稳定性。结果表明:在Ni/Hβ双功能催化剂中掺入不同金属助剂可调控催化剂表面的负载组分颗粒大小、活性分散度、B/L酸比例,以及金属催化加氢功能和酸催化烷基化功能的匹配。以4%Ni-0.2%Pd-3%La/Hβ(均为质量百分数以β分子筛质量为基准)为催化剂,在220℃、H2的GHSV为2 500 h-1、苯的LHSV为2.0 h-1条件下,苯转化率达34.44%,环己基苯选择性为74.67%,催化剂性能在240 h内没有明显下降。
[Abstract]:Using 尾 molecular sieve as carrier, bifunctional composite catalysts were prepared by isovolumetric impregnation method and used in the hydrogenation of benzene to prepare cyclohexylbenzene. X-ray powder diffraction (XRD) (XRD), nitrogen adsorption and desorption of (BET), (TPD) by temperature programmed desorption and high resolution transmission electron microscopy (HR-TEM) were used to investigate the synergistic catalysis between the components of the catalyst. The catalyst activity and stability were evaluated in a fixed bed reactor. The results showed that the particle size, active dispersion, B / L acid ratio, and the matching of metal catalytic hydrogenation function and acid catalytic alkylation function could be adjusted by adding different metal additives into Ni/H 尾 bifunctional catalyst. Under the conditions of 4%Ni-0.2%Pd-3%La/H 尾 (mass percent of all molecular sieves as the benchmark), at 220 鈩，
本文编号：2293063
[Abstract]:Using 尾 molecular sieve as carrier, bifunctional composite catalysts were prepared by isovolumetric impregnation method and used in the hydrogenation of benzene to prepare cyclohexylbenzene. X-ray powder diffraction (XRD) (XRD), nitrogen adsorption and desorption of (BET), (TPD) by temperature programmed desorption and high resolution transmission electron microscopy (HR-TEM) were used to investigate the synergistic catalysis between the components of the catalyst. The catalyst activity and stability were evaluated in a fixed bed reactor. The results showed that the particle size, active dispersion, B / L acid ratio, and the matching of metal catalytic hydrogenation function and acid catalytic alkylation function could be adjusted by adding different metal additives into Ni/H 尾 bifunctional catalyst. Under the conditions of 4%Ni-0.2%Pd-3%La/H 尾 (mass percent of all molecular sieves as the benchmark), at 220 鈩，
本文编号：2293063
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