SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (3): 534-539.DOI: 10.1016/j.cjche.2017.07.016

• Catalysis, kinetics and reaction engineering • Previous Articles     Next Articles

Pd catalysts supported on rGO-TiO2 composites for direct synthesis of H2O2: Modification of Pd2+/Pd0 ratio and hydrophilic property

Shuying Chen, Rui Tu, Jun Li, Xiaohua Lu   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2017-03-15 Revised:2017-07-24 Online:2018-04-18 Published:2018-03-28
  • Contact: Jun Li, Xiaohua Lu
  • Supported by:

    Supported by the National Key Basic Research Program of China (2013CB733505, 2013CB733501), the National Natural Science Foundation of China (91334202), the Natural Science Foundation of Jiangsu Province of China (BK2012421, BK20130062), the Research Fund for the Doctoral Program of Higher Education of China (20123221120015), the Project for Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Pd catalysts supported on rGO-TiO2 composites for direct synthesis of H2O2: Modification of Pd2+/Pd0 ratio and hydrophilic property

Shuying Chen, Rui Tu, Jun Li, Xiaohua Lu   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 通讯作者: Jun Li, Xiaohua Lu
  • 基金资助:

    Supported by the National Key Basic Research Program of China (2013CB733505, 2013CB733501), the National Natural Science Foundation of China (91334202), the Natural Science Foundation of Jiangsu Province of China (BK2012421, BK20130062), the Research Fund for the Doctoral Program of Higher Education of China (20123221120015), the Project for Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Abstract: The use of nanostructured composites as catalyst supports is a promising route to prepare catalysts with high selectivity and productivity. In this work, reduced graphene oxide-TiO2 (rGP-x) composites with a variation of reduced graphene oxide (rGO) content were synthesized by hydrothermal method. Pd/rGP-x catalysts were prepared in incipient-wetness impregnation method for the direct synthesis of H2O2 from H2 and O2. The morphology and electronic properties of catalysts were investigated by XPS, TEM, and Raman spectroscopy. The ratio of Pd2+/Pd0 and the hydrophobicity of the catalysts were increased with the rising content of rGO. As the amount of rGO in the catalysts varied in the range of 0.025 wt%-2 wt%, the selectivity of H2O2 exhibited a tendency of increasing firstly and then decreasing from 0.1 wt% to 2 wt%. It indicates that good catalytic performance for H2O2 synthesis can be achieved only when appropriate amount of rGO is introduced. The H2O2 selectivity and productivity of Pd/rGP-0.025 both improved remarkably compared with Pd/P25. This enhancement originated from the combined effects of the proper ratio of Pd2+/Pd0 and hydrophobicity of the catalyst.

Key words: Direct H2O2 synthesis, Reduced graphene oxide, Hydrothermal, Electronic structure, Desorption, Selectivity

摘要: The use of nanostructured composites as catalyst supports is a promising route to prepare catalysts with high selectivity and productivity. In this work, reduced graphene oxide-TiO2 (rGP-x) composites with a variation of reduced graphene oxide (rGO) content were synthesized by hydrothermal method. Pd/rGP-x catalysts were prepared in incipient-wetness impregnation method for the direct synthesis of H2O2 from H2 and O2. The morphology and electronic properties of catalysts were investigated by XPS, TEM, and Raman spectroscopy. The ratio of Pd2+/Pd0 and the hydrophobicity of the catalysts were increased with the rising content of rGO. As the amount of rGO in the catalysts varied in the range of 0.025 wt%-2 wt%, the selectivity of H2O2 exhibited a tendency of increasing firstly and then decreasing from 0.1 wt% to 2 wt%. It indicates that good catalytic performance for H2O2 synthesis can be achieved only when appropriate amount of rGO is introduced. The H2O2 selectivity and productivity of Pd/rGP-0.025 both improved remarkably compared with Pd/P25. This enhancement originated from the combined effects of the proper ratio of Pd2+/Pd0 and hydrophobicity of the catalyst.

关键词: Direct H2O2 synthesis, Reduced graphene oxide, Hydrothermal, Electronic structure, Desorption, Selectivity