无机材料学报 ›› 2021, Vol. 36 ›› Issue (12): 1283-1289.DOI: 10.15541/jim20210100

所属专题: 【虚拟专辑】化学反应催化剂(2020~2021)

• 研究论文 • 上一篇    下一篇

不同形貌MgAl LDH的制备及Pt/LDH的催化加氢性能

刘雯雯1(), 苗雨欣1,2(), 张轶扉1, 王心宇1, 兰玉婷1, 赵震1,2()   

  1. 1.沈阳师范大学 化学化工学院, 能源与环境催化研究所, 沈阳 110034
    2.中国石油大学(北京) 重质油国家重点实验室, 北京 102249
  • 收稿日期:2021-02-18 修回日期:2021-05-13 出版日期:2021-12-20 网络出版日期:2021-05-25
  • 通讯作者: 苗雨欣, 讲师. E-mail: yuxinmiao@synu.edu.cn;赵 震, 教授. E-mail: zhaozhen@synu.edu.cn;zhenzhao@cup.edu.cn
  • 作者简介:刘雯雯(1997-), 女, 硕士研究生. E-mail: 1753305303@qq.com
  • 基金资助:
    国家自然科学基金青年基金(21703144);中国博士后科学基金(2018M631687);辽宁省高等学校基本科研项目(LFW201705);辽宁省高等学校基本科研项目(LQN201715);沈阳师范大学博士启动项目(BS201805)

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

LIU Wenwen1(), MIAO Yuxin1,2(), ZHANG Yifei1, WANG Xinyu1, LAN Yuting1, ZHAO Zhen1,2()   

  1. 1. Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
    2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, Beijing 102249, China
  • Received:2021-02-18 Revised:2021-05-13 Published:2021-12-20 Online:2021-05-25
  • Contact: MIAO Yuxin, lecturer. E-mail: yuxinmiao@synu.edu.cn;ZHAO Zhen, professor. E-mail: zhaozhen@synu.edu.cn;zhenzhao@cup.edu.cn
  • About author:LIU Wenwen(1997-), female, Master candidate. E-mail: 1753305303@qq.com
  • Supported by:
    National Natural Science Foundation of China(21703144);China Postdoctoral Science Foundation(2018M631687);Basic Scientific Research Projects of Colleges and Universities of Liaoning Province(LFW201705);Basic Scientific Research Projects of Colleges and Universities of Liaoning Province(LQN201715);Doctoral Scientific Research Foundation of Shenyang Normal University(BS201805)

摘要:

如何制备性能高效、稳定的纳米Pt催化剂, 对提高肉桂醛C=O加氢选择性具有重要的实际价值和科学意义。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 ℃、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

Abstract:

How to design and fabricate highly efficient and stable Pt nano-catalyst is of 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 various morphologies were synthesized by co-precipitation and hydrothermal methods. The supported Pt/LDH catalysts were prepared by 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. The results show that the morphology of different supports exerts a significant influence on the structure and properties of Pt/LDH catalysts. Interaction between lamellae LDH nanosheet and active component Pt facilitates dispersing and stabilizing of Pt nanoparticles. Meanwhile, there are abundant alkaline sites and surface hydroxyl groups in the LDH support, which are beneficial to improve the catalytic hydrogenation activity and stability. Results of catalytic performance show that selectivity of cinnamon alcohol (CMO) and conversion of cinnamon aldehyde (CMA) at reaction temperature of 40 ℃, reaction pressure of 1 MPa, and reaction time of 120 min were 82.1% and 79.8%, respectively. After 5 rounds of cycle tests, the Pt/LDH catalyst still has excellent stability.

Key words: MgAl hydrotalcite, nanosheet, Pt catalyst, cinnamaldehyde hydrogenation, catalytic performance

中图分类号: