摘要
以ZSM-5沸石及不同碱处理时间下制备的微介孔HZSM-5作为催化剂载体,采用等体积浸渍法制备了一系列NiMo ZSM-5催化剂(分别记为NiMoPZ,NiMoAKZ-1,NiMoAKZ-2,NiMoAKZ-3)。采用X射线衍射、傅里叶变换红外光谱、N 2吸附-脱附、扫描电镜和热重分析对4种催化剂进行表征,并在反应温度410~530℃、反应压力1 MPa、质量空速2.4 h^(-1)、H_(2)三甲苯体积比300的条件下分别对4种催化剂催化1,3,5-三甲苯(1,3,5-TMB)加氢脱烷基反应性能进行评价。结果表明:不同碱处理时间会改变催化剂的孔结构、酸性和形貌,并且影响其加氢脱烷基反应性能;碱处理时间为2 h时制备的NiMoAKZ-2催化剂具有较优的加氢脱烷基反应性能,在反应温度为530℃时,1,3,5-TMB转化率为91.5%,轻质芳烃(BTX)收率为65.3%,BTX选择性为71.3%;NiMoAKZ-2催化剂的介孔孔道提高了1,3,5-TMB与酸性位的可接近性,且其表面非骨架硅铝物种较少,孔道贯通性较好。
A series of NiMo ZSM-5 catalysts(designated as NiMoPZ,NiMoAKZ-1,NiMoAKZ-2,NiMoAKZ-3 respectively)were prepared by using ZSM-5 zeolite and micro-mesoporous HZSM-5 catalysts prepared under different alkali treatment time as the support.The catalysts were characterized by X ray diffraction,Fourier transform infrared spectroscopy,N_(2) adsorption-desorption,scanning electron microscopy and thermogravimetric analysis.The hydrodealkylation performance of 4 catalysts were evaluated under the condition of a H 21,3,5-trimethylbenzene(1,3,5-TMB)volume ratio of 300,a reaction temperature of 410-530℃,a reaction pressure of 1 MPa,a MHSV of 2.4 h^(-1),respectively.The results showed that the pore structure,acidity and morphology of the catalyst were changed and the hydrodealkylation performance of the catalysts were affected by the alkali treatment time.The NiMoAKZ-2 catalyst prepared by alkali treatment for 2 h had excellent hydrodealkylation performance with the 1,3,5-TMB conversion of 91.5%,the BTX yield of 65.3%,and the BTX selectivity of 71.3%at the reaction temperature of 530℃.The accessibility of acidic sites by 1,3,5-TMB was improved by the mesoporous channel of NiMoAKZ-2 catalyst,and the surface of the catalyst had less non-framework Si-Al species,and the permeability of the channel was good.
作者
陈菲菲
刘旭彬
李德培
单书峰
曾兴业
吴世逵
周如金
林存辉
Chen Feifei;Liu Xubin;Li Depei;Shan Shufeng;Zeng Xingye;Wu Shikui;Zhou Rujin;Lin Cunhui(Key Laboratory of Inferior Crude Oil Processing of Guangdong Provincial Higher Education Institutes,School of Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming,Guangdong 525000;Guangdong Provincial Engineering Technology Research Center of Petrochemical Corrosion and Safety,Guangdong University of Petrochemical Technology)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2021年第5期67-75,共9页
Petroleum Processing and Petrochemicals
基金
广东石油化工学院人才引进项目(2017rc02)
广东石油化工学院青年创新人才培育项目(2017qn25)
茂名市科技计划项目(2018022&2019400)
广东省普通高校青年创新人才项目(2018KQNCX158)
广东石油化工学院实验课题研究项目(219010)
广东省低碳化学与过程节能重点实验室开放基金项目
广东省基础与应用基础研究基金项目(2020A1515110729)。
