【摘要】：以β分子篩為載體采用等體積浸漬法制備雙功能復合催化劑,并用于苯加氫烷基化制備環(huán)己基苯的反應。采用X射線粉末衍射(XRD)、氮氣吸附脫附(BET)、程序升溫脫附(TPD)及高分辨透射電子顯微鏡(HR-TEM)對催化劑組分間的協(xié)同催化作用進行考察。并在固定床反應裝置上評價了所制備的催化劑活性和穩(wěn)定性。結果表明:在Ni/Hβ雙功能催化劑中摻入不同金屬助劑可調(diào)控催化劑表面的負載組分顆粒大小、活性分散度、B/L酸比例,以及金屬催化加氫功能和酸催化烷基化功能的匹配。以4%Ni-0.2%Pd-3%La/Hβ(均為質(zhì)量百分數(shù)以β分子篩質(zhì)量為基準)為催化劑,在220℃、H2的GHSV為2 500 h-1、苯的LHSV為2.0 h-1條件下,苯轉化率達34.44%,環(huán)己基苯選擇性為74.67%,催化劑性能在240 h內(nèi)沒有明顯下降。
[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，

本文編號：2293063