CIESC Journal ›› 2021, Vol. 72 ›› Issue (11): 5643-5652.DOI: 10.11949/0438-1157.20211030

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Promotion of WO3 species on Pt/α-Al2O3 for the deep hydrogenation of naphthalene

Yu LIANG1(),Tong ZHAO1,Binbin ZHAO1,Lei LIU1(),Jinxiang DONG1,Mingxing TANG2,Xuekuan LI2   

  1. 1.College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China
  • Received:2021-07-23 Revised:2021-09-07 Online:2021-11-12 Published:2021-11-05
  • Contact: Lei LIU

WO3对Pt/α-Al2O3催化萘深度加氢的促进作用

梁瑜1(),赵彤1,赵斌彬1,刘雷1(),董晋湘1,唐明兴2,李学宽2   

  1. 1.太原理工大学化学化工学院,山西 太原 030024
    2.中国科学院山西煤炭化学研究所,山西 太原 030001
  • 通讯作者: 刘雷
  • 作者简介:梁瑜(1993—),女,博士研究生,lllyyy222666@163.com
  • 基金资助:
    国家自然科学基金项目(U1910202);山西省“1331工程”项目;山西省青年三晋学者支持计划项目

Abstract:

Pt-WO3/α-Al2O3 catalysts were prepared with sequential impregnation of WO3 and then Pt in α-Al2O3 supports without acid sites. The as-prepared were investigated the promotion of WO3 catalysts in the reaction of hydrogenation of naphthene at mild reaction conditions. XRD, Raman, HRTEM, XPS, and H2-TPR analyses reveal the basic structure and distribution of Pt and WO3 species. Py-IR analyses reveal that the changing of acid sites after loading Pt and WO3 species. Pt-WO3/α-Al2O3 catalysts have shown excellent catalytic performance for the hydrogenation of naphthalene to decalin at mild reaction conditions (70℃, 3 MPa, 1 h) with the conversion and selectivity of decalin are 100%. Combined with the characterization and catalytic performance, the pre-introduced Pt and WO3 species caused the strong interaction between Pd sites and WO3 and the efficient distribution of Pt by WO3 species. The strong acidity of the catalyst and the high degree of Pt dispersion are the key factors for the deep hydrogenation of naphthalene by Pt-WO3/α-Al2O3 under low temperature conditions, which is of great significance for the process of decalin as a hydrogen storage medium.

Key words: naphthalene, decalin, support, tungsten oxide, hydrogenation, catalyst

摘要:

采用无酸性的α-Al2O3为载体,预先沉积WO3然后浸渍法负载Pt物种,合成了系列Pt-WO3/α-Al2O3催化剂用于萘深度加氢反应,系统地研究了氧化钨物种在萘加氢反应中的作用。通过XRD、Raman、HRTEM、XPS和H2-TPR技术表征了Pt和WO3物种在载体表面的分散情况和状态,并利用Py-IR研究了载体负载氧化钨和Pt前后的酸性质变化。在温和的反应条件下(70℃、3 MPa、1 h)Pt-WO3/α-Al2O3催化剂表现出优异的萘深度加氢活性,萘的转化率和十氢萘的选择性均达到100%。结果表明,预先在载体表面引入的WO3和Pt产生了强相互作用,WO3提高了Pt物种的分散程度,催化剂的酸性来源于氧化钨物种的引入且和负载量成正比关系。催化剂较强的酸性和较高的Pt分散程度是Pt-WO3/α-Al2O3在低温条件下能够使萘深度加氢的关键因素,对于十氢萘作为储氢介质工艺具有重要的意义。

关键词: 萘, 十氢萘, 载体, 氧化钨, 加氢, 催化剂

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