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Design of selective hydrocracking catalysts for BTX production from diesel-boiling-range polycyclic aromatic hydrocarbons
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-19 , DOI: 10.1016/j.apcata.2017.08.019
Jaeuk Shin , Youngseok Oh , Yeseul Choi , Jihye Lee , Jung Kyoo Lee

Various metallic components (Ni, NiSn, NiW-S, CoMo-S and NiMo-S) with different hydrogenation (HYD) activities were supported on H-Beta or hybrid zeolites (BZ(x), where x denotes the weight percentage of H-ZSM-5 in the physical mixture of H-Beta and H-ZSM-5). These bifunctional catalysts were applied to the hydrocracking (HYC) of tetralin in a fixed-bed down-flow reactor at 4 MPa as a model reaction for polycyclic aromatic hydrocarbon (PAH) conversion to high-value benzene, toluene, and xylenes (BTX). From the HYC of tetralin over the series of metals/H-Beta catalysts, it was found that CoMo-S/H-Beta and NiMo-S/H-Beta, whose metallic components show moderate activities in the HYD of tetralin, exhibit higher BTX yields than the other catalysts whose metals have excessively high or low HYD activities. However, these catalysts show limited BTX yield (∼47.3 wt% at 425 °C) owing to the large coproduction of alkylbenzenes other than BTX. When metals with moderate HYD activities are supported on the hybrid zeolites, the BTX yield is significantly enhanced by the effect of H-ZSM-5 in the dealkylation of alkylbenzenes into BTX. NiMo-S/BZ(10) provides a BTX yield of 54.3 wt% and a total 1-ring aromatic yield as high as 63.8 wt% (corresponding to 94.4% of the theoretical maximum of 67.6 wt%) at 425 °C. Therefore, the NiMo-S/BZ(10) catalyst, where the metallic and acidic functions and structural properties of the zeolite are well balanced, show promise as an HYC catalyst for the hydroconversion of PAHs into high-value BTX mixtures.



中文翻译:

由柴油沸程多环芳烃生产BTX的选择性加氢裂化催化剂的设计

各种金属组分的(Ni,NISN,的NiW-S,的CoMo-S和的NiMo-S)具有不同氢化(HYD)活性负载在H-β或混合沸石(BZ(X),其中X表示在H-Beta和H-ZSM-5的物理混合物中H-ZSM-5的重量百分比。这些双功能催化剂在固定床下流式反应器中以4 MPa的压力应用于四氢萘的加氢裂化(HYC),作为多环芳烃(PAH)转化为高价值苯,甲苯和二甲苯(BTX)的模型反应。从四氢化萘在一系列金属/ H-Beta催化剂上的HYC,发现CoMo-S / H-Beta和NiMo-S / H-Beta的金属成分在四氢化萘的HYD中表现出适度的活性。 BTX的收率高于其金属的HYD活性过高或过低的其他催化剂。然而,由于大量共产除BTX以外的烷基苯,这些催化剂的BTX收率有限(在425°C时约为47.3 wt%)。当杂化沸石负载具有中等HYD活性的金属时,H-ZSM-5在烷基苯脱烷基化为BTX中的作用显着提高了BTX的收率。NiMo-S / BZ(10)在425°C下提供的BTX产率为54.3 wt%,一环芳族化合物的总产率高达63.8 wt%(相当于理论最大值67.6 wt%的94.4%)。因此,NiMo-S / BZ(10)催化剂在沸石的金属和酸性功能以及结构特性之间取得了良好的平衡,作为将PAHs加氢转化为高价值BTX混合物的HYC催化剂显示出了希望。

更新日期:2017-08-19
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