One-step hydroprocessing of fatty acids into renewable aromatic hydrocarbons over Ni/HZSM-5: insights into the major reaction pathways
作者:Shiyou Xing、Pengmei Lv、Jiayan Wang、Junying Fu、Pei Fan、Lingmei Yang、Gaixiu Yang、Zhenhong Yuan、Yong Chen
DOI:10.1039/c6cp06327f
日期:——
Considerable amounts of AHCs, up to 64.61 wt%, were produced through the one-step hydroprocessing of fatty acids over Ni/HZSM-5 catalysts. Hydrogenation, hydrocracking, and aromatization constituted the principal AHC formation processes. At a lower temperature, fatty acids were first hydrosaturated and then hydrodeoxygenated at metal sites to form long-chain hydrocarbons. Alternatively, the unsaturated fatty
对于生物航空燃料中的高热量和稳定性,至关重要的是一定含量的芳烃(AHC,8–25 wt%)。从废油或不可食用的油中获得的脂肪酸是用于AHC生产的可再生经济原料。通过在Ni / HZSM-5催化剂上对脂肪酸进行一步加氢处理,可生产出数量高达64.61 wt%的AHC。加氢,加氢裂化和芳构化是AHC的主要形成过程。在较低的温度下,首先将脂肪酸加氢饱和,然后在金属位点加氢脱氧以形成长链烃。或者,不饱和脂肪酸可在酸位点直接脱氧而不先饱和。长链烃裂化为乙烷,丙烷和C 6 -C等气体催化剂的布朗斯台德酸位上有8个烯烃;这些在催化剂的路易斯酸位上进行了狄尔斯-阿尔德反应,形成了AHC。C 6 -C 8烯烃被确定为AHC形成的关键中间体。随着催化剂中Ni含量的增加,布朗斯台德酸位点密度由于被金属纳米颗粒覆盖而降低。负载10%(重量)的Ni可获得良好的性能,其中Ni纳米颗粒表现出多面体形态,暴露出更多的芳构化活性位。