应用化学 ›› 2023, Vol. 40 ›› Issue (4): 597-609.DOI: 10.19894/j.issn.1000-0518.220321

• 能源材料 • 上一篇    下一篇

离子液体调控合成Pt-Pd双金属纳米材料及其催化氨硼烷水解释氢

李慧慧, 姚开胜(), 赵亚南, 范李娜, 田钰琳, 卢伟伟()   

  1. 河南科技大学化工与制药学院,洛阳 471023
  • 收稿日期:2022-10-07 接受日期:2023-02-22 出版日期:2023-04-01 发布日期:2023-04-17
  • 通讯作者: 姚开胜,卢伟伟
  • 基金资助:
    国家自然科学基金(21673067);河南省科技攻关项目(192102210043)

Ionic Liquid-Modulated Synthesis of Pt-Pd Bimetallic Nanomaterials and Their Catalytic Performance for Ammonia Borane Hydrolysis to Generate Hydrogen

Hui-Hui LI, Kai-Sheng YAO(), Ya-Nan ZHAO, Li-Na FAN, Yu-Lin TIAN, Wei-Wei LU()   

  1. Chemical Engineering & Pharmaceutics School,Henan University of Science & Technology,Luoyang 471023,China
  • Received:2022-10-07 Accepted:2023-02-22 Published:2023-04-01 Online:2023-04-17
  • Contact: Kai-Sheng YAO,Wei-Wei LU
  • About author:luwei1980@126.com
    ksyao@haust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21673067);the Key Science and Technology Project of Henan Province(192102210043)

摘要:

在离子液体溴化1-十四烷基-3-甲基咪唑([C14mim]Br)的调控下,以聚乙烯吡咯烷酮(PVP)为稳定剂,在90 ℃水溶液中一步制备出双金属Pt-Pd纳米材料。通过透射电子显微镜(TEM)、扫描电子显微镜(SEM)、高角度环形暗场扫描透射电镜(HAADF-STEM)、X射线能谱(EDS)、X射线衍射仪(XRD)和X射线光电子能谱(XPS)等对产物的形貌、结构、组成和价态等进行了详细的表征分析。结果表明,除了纯Pd样品,其它比例的Pt-Pd纳米材料均具有多孔结构。离子液体对多孔Pt-Pd纳米材料的调控起到了重要作用,对于[C n mim]Br离子液体,当烷基侧链长≥C12时,有利于形成多孔的Pd@Pt核壳球形结构。在氨硼烷水解释氢实验中,不同比例的Pt-Pd双金属纳米材料均表现出优于商用Pd/C的催化活性。其中,Pt3Pd7纳米材料具有最优的催化性能,催化过程在6 min内完成,产氢率高达100%。氨硼烷水解释氢的活化能(Ea)为36.15 kJ/mol,周转频率(TOF)为35.72 mol/(mol·min)。循环5次反应仅需51 min,产率仍能达到100%,表明该催化剂具有较高的催化活性和稳定性。

关键词: 离子液体, Pt-Pd双金属, 纳米材料, 氨硼烷水解释氢

Abstract:

Herein, under the modulation of an ionic liquid 1-tetradecyl-3-methylimidazole bromide ([C14mim]Br), Pt-Pd bimetallic nanomaterials are prepared in one-pot at 90 ℃ in aqueous solution with polyvinylpyrrolidone (PVP) as the stabilizer. The morphology, structure, components and valence states of the products are characterized and analyzed in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffractometry (XRD) and X-ray photoelectron spectrometer (XPS). The results show that except for pure Pd sample, Pt-Pd bimetallic nanomaterials with other Pt/Pd ratios have porous structures. [C14mim]Br plays an important role in regulating the synthesis of Pt-Pd porous nanomaterials. For the ionic liquids [C n mim]Br with the alkyl chain length≥C12, it is beneficial for the formation of porous Pd@Pt spherical structures. In the experiment of the ammonia borane hydrolysis, Pt-Pd bimetallic nanomaterials with various ratios show higher catalytic activities than commercial Pd/C, among which Pt3Pd7 nanomaterials have the best catalytic performance. The hydrogen generation reaction can be quickly achieved within only 6 min and the hydrogen yield is up to 100%. At 25 ℃, the activation energy (Ea) and the turnover frequency (TOF) values are calculated to be 36.15 kJ/mol and 35.72 mol/(mol·min), respectively. Furthermore, the reaction for the five catalytic cycles can be achieved within 51 min, and the yield can still reach 100%, indicating that the catalyst has high activity and good stability.

Key words: Ionic liquids, Pt-Pd bimetals, Nanomaterials, Hydrogen production of ammonia borane hydrolysis

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