双功能混合催化剂催化二芳烃和三芳烃加氢裂化制单芳烃

A. Mettu, Ninad Loke, Vilas A. Patil, Rahul Panday, Sreenivasarao Gajula
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摘要

在这项研究中,我们展示了在Pt/Al2O3和Y沸石的混合物上,聚(二和三)芳香族化合物选择性加氢裂化成单芳香族化合物,如苯、甲苯和二甲苯(BTX)。多芳香族化合物饲料是一种组合模拟模型饲料,其组成与轻循环油(LCO)相似。进料在固定床反应器中通过催化剂混合物进行处理:第一步,在Pt/Al2O3催化剂的存在下,二芳香烃和三芳香烃进行选择性加氢,然后在Y沸石上将部分加氢的多芳香烃转化为富含btx的流。采用x射线粉末衍射仪(XRD)和高角环形暗场扫描透射电镜(HAADF-STEM)研究了Pt/Al2O3的结构性能和分散性。采用程序升温解吸法(NH3- tpd)研究了不同SiO2/Al2O3比(SAR)的Y型沸石的酸性。此外,用氮气吸附解吸法测定了催化剂的结构性质。考察了温度、质量时空速(WHSV)、Y型沸石的不同合成孔径(SAR)、Pt/Al2O3、Y型沸石wt%比、石蜡浓度等参数的影响。在450℃,WHSV-0.7 h-1, H2压力60 bar, Pt/Al2O3, Y沸石比为1:2 (wt%), Y沸石SAR为80的条件下,BTX产率可达~28 wt.%。这些结果表明,BTX的产率很大程度上取决于Y型沸石的加氢功能(Pt/Al2O3)和酸性功能。此外,石蜡的浓度对二芳和三芳的转化以及BTX生成的期望产物起着关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrocracking of Di-and Triaromatic Hydrocarbons to Monoaromatics over Mixed Bi-functional Catalysts
In this study, we present selective hydrocracking of poly (di and tri) aromatic compounds to monoaromatics, such as benzene, toluene, and xylenes (BTX), over a mixture of Pt/Al2O3 and Y zeolites. The polyaromatic compounds feed is a combined simulated model feed, which is similar to light cycle oil (LCO) in composition. The feed is processed in a fixed bed reactor over a catalyst mixture: in the first step, selective hydrogenation of di and tri-aromatic compounds occurs in the presence of Pt/Al2O3 catalyst, followed by conversion of selective hydrocracking of partial hydrogenated polyaromatic hydrocarbons into BTX-rich stream over Y zeolite. The structural properties and Pt dispersion of Pt/Al2O3 were studied by X-ray powder diffraction (XRD) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The acidity of Y zeolite with different SiO2/Al2O3 ratios (SAR) was studied by temperature-programmed desorption of NH3 (NH3-TPD). In addition, the textural properties of catalysts were determined using the N2 adsorption and desorption method. Different parameters such as the effect of temperature, effect of weight hourly space velocity (WHSV), different SAR of Y zeolite, Pt/Al2O3, and Y zeolite wt% ratios, and paraffin concentration were investigated. The maximum BTX yield of ~28 wt.% was obtained at 450°C, WHSV-0.7 h-1, H2 pressure 60 bar, Pt/Al2O3, and Y zeolite ratios of 1:2 (wt%) at Y zeolite SAR of 80. These results suggest that the yield of BTX strongly depends on the hydrogenation function (Pt/Al2O3) and acidity function of Y zeolite. Furthermore, the concentration of paraffin plays a key role in the conversion of diaromatics and triaromatics and desired products of BTX formation.
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