An Efficient Pt/Ce y CoO x Composite Metal Oxide for Catalytic Oxidation of Toluene
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An Efficient Pt/CeyCoOx Composite Metal Oxide for Catalytic Oxidation of Toluene Yin Lin1 · Jing Sun1 · Shuangju Li2 · Da Wang2 · Chuanhui Zhang3 · Zhong Wang1,2 · Xuebing Li2 Received: 19 January 2020 / Accepted: 8 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Using ZIF-67 as a precursor, a series of Pt/CeyCoOx composite metal oxide catalysts with different molar ratios were prepared by a co-precipitation method and further used for catalytic oxidation of toluene. The Pt/Ce0.2CoOx catalyst showed the highest activity for toluene oxidation (T90 = 173 °C), which was related to the presence of Co-Ce solid solution, the more abundant surface adsorbed oxygen species and the enhanced redox property. Graphic abstract
Keywords Toluene oxidation · Pt/CeyCoOx catalysts · Solid solution · Surface adsorbed oxygen
1 Introduction Yin Lin, Jing Sun, and Shuangju Li have contributed equally. * Zhong Wang [email protected] 1
College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China
2
Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
3
Institute of Materials for Energy and Environment, Qingdao University, Qingdao 266071, China
Volatile organic components (VOCs) are mainly derived from vehicle exhaust, industrial production and human activities. VOCs are not only harmful to human’s health but also cause environmental problems such as photochemical smog and acid rain [1]. Among the proposed strategies for eliminating VOCs, catalytic oxidation of VOCs into CO2 and H2O is one of the most promising methods, which has the advantages of low energy consumption and no secondary pollution [2]. Catalysts used for VOCs oxidation are mainly divided into two categories, noble metal catalysts and transition metal oxides [3–6]. However, the catalytic performance of
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single oxide catalysts is lower than that of noble metal catalysts [7, 8]. The combination of two or more metal oxides was an effective method to improve catalytic activity due to its synergistic effects [9–11]. Metal organic frameworks (MOFs) have attracted the attention as novel precursors to synthesize porous inorganic materials. As a subfamily of MOFs, zeolitic imidazolate frameworks (ZIFs) not only have the characteristics of MOFs, such as ordered structure, unique morphology, modifiable organic bridged ligands, but also have the advantages of high thermal stability of traditions zeolite [12, 13]. Among them, ZIF-67 is one of the most researched typical ZIF materials [14, 15]. In this work, a series of Pt/CeyCoOx catalysts with different molar ratios were synthesized using ZIF-67 as the precursor, which have the advantages of both noble metal and transition metal catalysts. The effects of molar ratios of Ce to Co on the structure, redox property and the catalytic activity of the catalysts were discussed by several characterization techn
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