nNiMoO_x·ZSM-5催化剂的正己烷异构化性能  

n-Hexane isomerization performance of nNiMoO_x·ZSM-5 catalyst

作　　者：郭文光[1] 陈亮 张传驹 孔令鹏 靳广洲[1] Guo Wenguang Chen Liang Zhang Chuanju Kong Lingpeng Jin Guangzhou(College of Chemical Engineering, Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijinglnstitute ofPetro-ChemicalTechnology, Beijing 102617, China)

机构地区：[1]北京石油化工学院化学工程系燃料清洁化及高效催化减排技术北京市重点实验室,北京102617

出　　处：《石油化工》2017年第10期1238-1242,共5页Petrochemical Technology

基　　金：国家重点基础研究发展计划资助项目(2012CB215002)

摘　　要：采用等体积浸渍法制备了nNiMoO_x·ZSM-5单相复合体催化剂,采用XRD,NH3-TPD,BET等方法对其物相结构、表面酸性、比表面积进行了表征;以正己烷为模型反应物,在高压微反装置上对nNiMoO_x·ZSM-5催化剂的正己烷异构化反应性能进行了评价。表征结果显示,nNiMoO_x·ZSM-5单相复合体催化剂中,ZSM-5分子筛骨架结构保持完好,金属活性组分Ni和Mo以Ni Mo O x原子簇的形式定位于ZSM-5分子筛的孔道内,与分子筛的骨架氧配位形成了nNiMoO_x·ZSM-5单相复合体,引起ZSM-5分子筛的晶胞收缩,晶胞参数和晶胞体积减小;随Ni/Mo原子比的增大,nNiMoO_x·ZSM-5催化剂的酸量增加,比表面积整体变化不明显。在2.0 MPa、液态空速1.0 h-1、氢烃摩尔比4∶1的反应条件下,Ni/Mo原子比为2.0的nNiMoO_x·ZSM-5催化剂在220℃时正己烷转化率为69.6%,250℃时正己烷转化率为79.3%;随反应温度的升高,异构化选择性呈先增大后减小的趋势。A series of nNiMoOx · ZSM-5 catalysts were prepared by impregnation method, and characterized by XRD, NH3-TPD and BET techniques. Isomerization performance of the catalysts was evaluated by using n-hexane as model reactant in a high-pressure-micro-reactor. The results indicate that there are no crystalline peaks of NiOx and MoOx in nNiMoOx · ZSM-5 catalysts. Metal active component Ni and Mo is located in the porous channel of ZSM-5 in the form of NiMoOx clusters to generate nNiMoOx ~ ZSM-5 single-phase complex. It induces the contraction of ZSM-5 lattice cell and decreases of lattice parameters and cell volume. Acid amount of nNiMoOx · ZSM-5 catalysts increases and the specific surface area change is not evidently with the increasing of Ni/Mo atomic ratio. Under the conditions of 2.0 MPa, LHSV 1.0 h-1, hydrogen/hydrocarbon molar ratio 4 ： 1, the conversion of n-hexane over nNiMoOx.ZSM-5 catalyst with Ni/Mo atomic ratio 2.0 reaches to 69.6% at 220 ℃ and 79.3% at 250℃ . With the increasing of reaction temperature, the isomerization selectivity increases first and then decreases.

关 键 词：nNiMoOx·ZSM-5催化剂 单相复合体 正己烷异构化 转化率 选择性 

分 类 号：TQ426.8[化学工程]