Preparation of MgAl LDH with Different Morphologies and Catalytic Hydrogenation Performance of Pt/LDH Catalysts

LIU Wenwen, MIAO Yuxin, ZHANG Yifei, WANG Xinyu, LAN Yuting, ZHAO Zhen
2021 Journal of Inorganic Materials  
本研究采用共沉淀法和水热法制备不同形貌的 MgAl 水滑石(LDH),用等体积浸渍法制备负载型 Pt/LDH 催化剂,研 究不同形貌的 LDH 对 Pt 催化肉桂醛选择加氢性能的影响。利用不同表征方法对催化剂结构、形貌、表面理化性能进 行分析。结果表明,LDH 载体的形貌对 Pt/LDH 催化剂的结构和性能影响较大,具有片层结构的 LDH 纳米片与活性 组分 Pt 之间的相互作用易于贵金属 Pt 的分散和稳定。同时,LDH 载体中存在丰富的碱性位点和表面羟基,有利于 提高催化加氢活性和稳定性。催化性能评价表明,在反应温度为 40 o C、反应压力为 1 MPa、反应时间为 120 min 的 条件下,肉桂醇(CMO)的选择性为 82.1%,肉桂醛的转化率为 79.8%,经过 5 轮循环测试,催化剂仍具有较好的稳定 性。 关 键 词: MgAl 水滑石;纳米片;Pt 催化剂;肉桂醛加氢;催化性能 中图分类号: TQ174 文献标识码: A Abstract: How to design and fabricate one highly efficient and stable Pt
more » ... ent and stable Pt nano-catalyst has important practical value and scientific significance for improving the C=O hydrogenation selectivity of cinnamaldehyde. In present study, a series of MgAl hydrotalcite (LDH) supports with different morphology were synthesized by co-precipitation and hydrothermal methods. The supported Pt/LDH catalysts were prepared by the incipient wet impregnation (IMP) method with LDH supports and used for cinnamaldehyde selective hydrogenation reaction, and influences of LDH with different morphology for the catalyst activity were studied. The structure, morphology, surface physicochemical properties of these catalysts were characterized by different methods. The results shows that the morphology of different supports has a significant influence on the structure and properties of Pt/LDH catalysts. The interaction between the lamellae LDH nanosheet and the active component Pt facilitated the dispersing and stabilizing of Pt nanoparticles. Meanwhile, there are abundant 第*期 刘雯雯, 等: 不同形貌 MgAl LDH 的制备及 Pt/LDH 的催化加氢性能
doi:10.15541/jim20210100 fatcat:quff4r4hyfggvc42jtswbuob3e