煤炭转化2025，Vol.48Issue(6)：17-26,10.DOI:10.19726/j.cnki.ebcc.202506002
沸石间转化法制备xNi@HZSM-5用于煤焦油催化提质的研究
Catalytic upgrading of coal tar with xNi@HZSM-5 prepared by interzeolite conversion
摘要
Abstract
Coal pyrolysis tar catalytic upgrading can convert its heavy components into light aromatic hydrocarbons.However,in conventional Ni/HZSM-5 catalysts,most Ni species are located on the external surface of the zeolite,which leads to excessive cracking of the tar while increasing the content of light aromatic hydrocarbons.This study used a zeolite interconversion method based on H-Beta as the parent zeolite to prepare xNi@HZSM-5(where x represents the Ni content in mass frac-tion),effectively encapsulating Ni metal within the channels of the zeolite.The spatial confinement characteristics of the HZSM-5 channels were used to activate hydrogen-rich gas and separate the active sites for tar cracking.At the same time,this method successfully overcomed the drawback of insufficient metal encapsulation in traditional hydrothermal synthesis.The study finds that after zeolite interconversion,the 5Ni@HZSM-5 catalyst exhibites uniform rice-grain-like particles with highly dis-persed Ni species.During in-situ catalytic cracking,modification of the catalyst support before and after zeolite interconversion has little effect on tar characteristics.Furthermore,the interconverted catalyst produces higher yields of total and light tar fractions compared with the parent zeolite.The catalytic performance of xNi@HZSM-5 toward tar model compounds,such as pyrene and fluoran-thene,is investigated under a H2 atmosphere,as well as the effects on hydrogenation products.The results show that the 5Ni@HZSM-5 catalyst achieves the highest conversion rates for pyrene and fluor-anthene,49.1%and 56.8%,respectively.At this point,the selectivity for light aromatic hydrocar-bons also reaches its maximum,70.3%and 76.0%,respectively.关键词
焦油催化提质/沸石间转化法/xNi@HZSM-5/模型化合物/轻质芳烃Key words
tar catalytic upgrading/zeolite interconversion method/xNi@HZSM-5/model compounds/light aromatic hydrocarbons分类
化学工程引用本文复制引用
郭向阳,樊磊,王明义,董子豪,王玉高,王俊文..沸石间转化法制备xNi@HZSM-5用于煤焦油催化提质的研究[J].煤炭转化,2025,48(6):17-26,10.基金项目
国家自然科学基金项目(22308244). （22308244）
