低碳化学与化工2025，Vol.50Issue(8)：26-33,8.DOI:10.12434/j.issn.2097-2547.20250034
NiAl-LDH催化焦油模型化合物加氢转化性能
Hydrotreatment performance of NiAl-LDH catalyst for tar model compounds
摘要
Abstract
In the process of tar upgrading,achieving synergistic regulation of tar cracking and hydrogen-rich gas conversion is key to improving catalyst performance.To this end,Ni-based catalysts with a layered hydrotalcite-like structure(NiAl-LDH)were prepared using a hydrothermal method,and Co was introduced to optimize their performance.Relying on the interlayer confinement effect of the hydrotalcite-like structure,the spatial separation of active sites for tar catalytic conversion and hydrogen-rich gas activation was realized,enabling uniform distribution of Ni on the main layer plate.Due to the large molecular size of tar model compounds(such as pyrene and fluoranthene),they are unable to enter the interlayer structure,and thus their cracking mainly occurs on the catalyst surface.In contrast,small gas molecules can enter the interlayer and be effectively activated on the catalyst surface.The results show that the introduction of Co significantly promotes the dispersion and improve reduction performance of Ni,with the optimal catalytic performance achieved when n(Ni)/n(Co)=5.Under reaction conditions of 500℃,the Ni2.5Co0.5Al-LDH catalyst achieves a pyrene hydrogenation catalytic conversion rate of 48.03%,with a light aromatic hydrocarbon(BTX)selectivity of 55.63%.In addition,due to the easier cleavage of C—C bonds in fluoranthene,its conversion rate and BTX selectivity are higher than those of pyrene.The Ni located on the main layer plate can activate H2 to generate·H radicals,which help stabilize the tar cracking fragments,thereby enhancing BTX selectivity in the products.This study can provide new insights into for design of tar upgrading catalysts.关键词
焦油催化提质/芘/荧蒽/水滑石/Ni基催化剂/Co掺杂Key words
tar catalytic upgrading/pyrene/fluoranthene/hydrotalcite/Ni-based catalyst/Co-doped分类
化学化工引用本文复制引用
雷海凤,樊磊,王明义,董子豪,郭向阳,王俊文..NiAl-LDH催化焦油模型化合物加氢转化性能[J].低碳化学与化工,2025,50(8):26-33,8.基金项目
国家自然科学基金(22308244). （22308244）
