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

doi:10.1016/j.cjche.2017.07.016

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

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

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

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

Shuying Chen, Rui Tu, Jun Li, Xiaohua Lu. Pd catalysts supported on rGO-TiO₂ composites for direct synthesis of H₂O₂: Modification of Pd²⁺/Pd⁰ ratio and hydrophilic property[J]. Chin.J.Chem.Eng., 2018, 26(3): 534-539.

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

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

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