高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (8): 20220133.doi: 10.7503/cjcu20220133

• 研究论文: 无机化学 • 上一篇    下一篇

介孔γ-Al2O3微球的高效制备及负载Pd催化剂的性能

谭彦1, 余申1, 吕佳敏1, 刘湛1, 孙明慧2(), 陈丽华1(), 苏宝连1,2   

  1. 1.武汉理工大学材料复合新技术国家重点实验室, 武汉 430070
    2.比利时那慕尔大学无机材料化学实验室, 那慕尔B? 5000
  • 收稿日期:2022-03-03 出版日期:2022-08-10 发布日期:2022-04-09
  • 通讯作者: 孙明慧,陈丽华 E-mail:hui.sun@unamur.be;chenlihua@whut.edu.cn
  • 基金资助:
    国家自然科学基金(U20A20122)

Efficient Preparation of Mesoporous γ-Al2O3 Microspheres and Performance of Pd-loaded Catalysts

TAN Yan1, YU Shen1, LYU Jiamin1, LIU Zhan1, SUN Minghui2(), CHEN Lihua1(), SU Baolian1,2   

  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China
    2.Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,Namur B? 5000,Belgium
  • Received:2022-03-03 Online:2022-08-10 Published:2022-04-09
  • Contact: SUN Minghui,CHEN Lihua E-mail:hui.sun@unamur.be;chenlihua@whut.edu.cn
  • Supported by:
    the National Natural Science Foudation of China(U20A20122)

摘要:

多孔γ-Al2O3由于具有高比表面积、 强吸附性和良好的热稳定性而被广泛用作载体材料. 但其存在制备方法复杂、 能耗高、 纯度低及环境污染等问题, 因此开发高效制备高纯度多孔γ-Al2O3的合成方法具有重要的研究价值. 本文利用醇铝水解缩合反应, 在常温常压下一步合成出具有高比表面积、 高孔体积、 高纯度的介孔纳米片状γ-Al2O3微球, 研究了醇铝水解缩合反应过程中添加剂用量、 反应温度和后处理烘干温度等条件对γ-Al2O3孔道结构及形貌的影响. 并采用浸渍法进一步制备出贵金属Pd高度分散的负载型介孔Pd/γ-Al2O3微球催化材料, 其在硝基苯加氢和苯甲醇氧化反应中均表现出优异的催化性能. 由于丰富的介孔孔道结构和高度分散的负载贵金属Pd, 介孔Pd/γ-Al2O3微球在反应30 min后就达到了93.78%的硝基苯转化率和98.58%的苯胺选择性, 比商用的纳米颗粒型Pd/γ-Al2O3分别提高了15.55%和17.58%, 且循环使用后其催化性能基本保持不变. 在苯甲醇氧化反应中, 介孔Pd/γ-Al2O3微球的苯甲醇转化率较对比样提高了26.39%且长时间保持不变. 本工作为开发高性能多孔γ-Al2O3负载型催化材料提供新的思路.

关键词: 介孔γ-Al2O3, 醇铝水解, 钯负载, 微球, 催化

Abstract:

Porous γ-Al2O3 has been widely used as the support material due to its ultrahigh specific surface area, strong adsorption capacity and great thermal stability. However, owing to a series of problems existing in the synthesis process of porous γ-Al2O3 materials, like complex preparation method, high energy consumption, low purity and serious environmental pollution, it is important to develop a synthesis method of high-purity porous γ-Al2O3 catalyst possessing high efficiency with abundant pore structures. In this paper, based on the chemistryof hydrolysis condensation reaction of aluminum alkoxide, mesoporous γ-Al2O3 microspheres with high surface area, pore volume and purity were synthesized under normal temperature and pressure conditions, and the influences of additive dosage, reaction temperature, post-treatment drying temperature and other factors on the pore structure and morphology of γ-Al2O3 were also systematically studied. In the same breath, the supported mesoporous Pd/γ-Al2O3 microsphere catalytic material with highly dispersed precious metal Pd was further prepared by the impregnation method, which clearly performed excellent catalytic performances in both hydrogenation of nitrobenzene and oxidation of benzyl alcohol. Due to the abundant mesoporous pore structure and highly dispersed loaded precious metal Pd, the mesoporous Pd/γ-Al2O3 microspheres achieved 93.78% nitrobenzene conversion and 98.58% aniline selectivity after 30 min, which are respectively 15.55% and 17.58% higher than that of the commercial nanoparticle Pd/γ-Al2O3, the catalytic performance remained essentially unchanged after recycling. The benzyl alcohol conversion realized a remarkable increase of 26.39% compared to the comparison sample and remained unchanged in a long time oxidation reaction of benzyl alcohol. This work will provide a new strategy for developing high-performance porous γ-Al2O3 loaded catalysts.

Key words: Mesoporous γ-Al2O3, Aluminium alkoxide hydrolysis, Pd load, Microsphere, Catalysis

中图分类号: 

TrendMD: