应用化学 ›› 2024, Vol. 41 ›› Issue (12): 1732-1741.DOI: 10.19894/j.issn.1000-0518.240194

• 研究论文 • 上一篇    下一篇

La-Pd/ γ-Al2O3对蒽加氢饱和性能的影响

张楠, 雷海凤, 白丽军, 郭向阳, 王明义, 王俊文()   

  1. 太原理工大学化学工程与技术学院,太原 030024
  • 收稿日期:2024-04-26 接受日期:2024-11-18 出版日期:2024-12-01 发布日期:2025-01-02
  • 通讯作者: 王俊文
  • 基金资助:
    国家自然科学基金(22308244)

Influence of La-Pd/ γ -Al2O3 on the Performance for Hydrogenation Saturation of Anthracene

Nan ZHANG, Hai-Feng LEI, Li-Jun BAI, Xiang-Yang GUO, Ming-Yi WANG, Jun-Wen WANG()   

  1. College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2024-04-26 Accepted:2024-11-18 Published:2024-12-01 Online:2025-01-02
  • Contact: Jun-Wen WANG
  • About author:wangjunwen@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22308244)

摘要:

煤焦油以及重油中多环芳烃的存在会降低油品的质量,污染环境。 为了降低化石资源中的有害物质含量,减少对环境的污染,同时制备高效的轻质燃油,使用蒽作为多环芳烃模型化合物进行催化加氢饱和。 采用浸渍法制备了一系列不同La质量分数的Pd/γ-Al 2 O3催化剂,并通过X射线衍射(XRD)、X射线光电子能谱(XPS)和氨气程序升温脱附(NH3-TPD)等表征手段考察了La的引入对催化剂的结构、性质以及蒽加氢制备全氢蒽反应性能的影响。 结果表明,适量La的添加显著提高了全氢蒽的选择性,当La金属的负载量(质量分数)为1%时,温度为275 ℃时,氢气压力为4 MPa时,蒽加氢的转化率最高,为99.9%。 催化剂的XRD表征结果显示,适当的金属La掺杂到Pd基催化剂中减少了催化剂的金属颗粒尺寸,提高了Pd的分散度。 XPS表征结果表明,引入1%La后,Pd0活性金属含量最高,其加氢效果最好。 NH3-TPD结果表明,弱酸性较高有利于蒽加氢反应的深度加氢。 对设计高效的贵金属催化剂催化蒽合成全氢蒽提供了一定的理论指导。

关键词: 蒽, 加氢饱和, La-Pd双金属催化剂, 全氢蒽

Abstract:

The presence of polycyclic aromatic hydrocarbons in coal tar and heavy oil can reduce the quality of oil products and pollute the environment. In order to reduce the content of harmful substances in fossil resources, minimize environmental pollution, and prepare efficient light fuels, anthracene is used as a model compound for catalytic hydrogenation saturation of polycyclic aromatic hydrocarbons. A series of Pd/γ-Al2O3 catalysts with different mass fractions of La were prepared by impregnation method, and the effects of La introduction on the structure and properties of the catalysts, as well as the reaction performance of anthracene hydrogenation to fully hydrogenated anthracene, were investigated by characterization methods such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ammonia gas temperature programmed desorption (NH3-TPD). The results showed that the addition of an appropriate amount of La significantly improved the selectivity of fully hydrogenated anthracene. When the loading mass fraction of La metal was 1%, the temperature was 275 ℃, and a hydrogen pressure was 4 MPa, the conversion rate of anthracene hydrogenation is the highest, at 99.9%. The XRD characterization results of the catalyst showed that appropriate doping of metal La into Pd based catalyst reduced the metal particle size of the catalyst and improved the dispersion of Pd. The XPS characterization results indicate that the introduction of 1% La results in the highest content of Pd0 active metal and the best hydrogenation effect. The NH3-TPD results indicate that a higher degree of weak acidity is beneficial for the deep hydrogenation of anthracene. This provides theoretical guidance for designing efficient precious metal catalysts to catalyze the synthesis of fully hydrogenated anthracene from anthracene.

Key words: Anthracene, Hydrogenation saturation, La-Pd bimetallic catalyst, Perfluoroanthrene

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