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CeOx doping on a TiO2-SiO2 supporter enhances Ag based adsorptive desulfurization for diesel

XU Cheng-zhi ,  ZHENG Mei-qin ,  CHEN Keng ,  HU Hui ,  CHEN Xiao-hui

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引用本文: XU Cheng-zhi, ZHENG Mei-qin, CHEN Keng, HU Hui, CHEN Xiao-hui. CeOx doping on a TiO2-SiO2 supporter enhances Ag based adsorptive desulfurization for diesel[J]. 燃料化学学报, 2016, 44(08): 943-953. shu
Citation:  XU Cheng-zhi, ZHENG Mei-qin, CHEN Keng, HU Hui, CHEN Xiao-hui. CeOx doping on a TiO2-SiO2 supporter enhances Ag based adsorptive desulfurization for diesel[J]. Journal of Fuel Chemistry and Technology, 2016, 44(08): 943-953. shu

CeOx doping on a TiO2-SiO2 supporter enhances Ag based adsorptive desulfurization for diesel

  • 1.

    1. National Engineering Research Center of Chemical Fertilizer Catalysts, Fuzhou University, Fuzhou 350002, China;

  • 2.

    2. School of Chemical Engineering, Fuzhou University, Fuzhou 350116, China

    • 通讯作者: CHEN Xiao-hui
  • 基金项目:

    国家自然科学基金（21376055）资助 

摘要: In this work, the impact of CeOx doping on a TiO2-SiO2 supporter on the Ag based adsorptive desulfurization for Chinese standard diesel was studied. The dispersion and valence states of Ce, Ti and Ag species were characterized, and the impact of Ce doping was investigated. The results indicated that Ce species and Ti species were dispersed evenly on the surface of SiO2 via a novel co-impregnation method. Following CeOx doping, the Ag species were in the form of oxides (about 5nm) instead of metallic Ag particles (about 35nm), which is due to the large amount of coordinative unsaturated sites provided by the interaction between CeOx and TiO2, as well as the oxidation-reduction property of CeOx. The Ag in the active oxide state (Ag2O2) and dispersed evenly on the supporter could interact with sulfur compounds more favorably, and therefore showed a good performance in the adsorptive desulfurization. In both static batch and dynamic breakthrough desulfurization tests, Ag-CeOx/TiO2-SiO2 was proved to be a more efficient adsorbent compared with Ag-TiO2-SiO2. It was found that the desulfurization performance of Ag-TiO2-SiO2 exhibited an excellent improvement (22.5%) after being doped with CeOx. In the static equilibrium tests, the equilibrium sulfur capacity of Ag-CeOx/TiO2-SiO2 was up to 5.38mg/g for CN-II diesel (sulfur content 952.9mg/kg) and the sulfur content of the CN-IV diesel (sulfur content 39.0mg/kg) after desulfurization was less than 10mg/kg, which could meet the CN-V standard.

English

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  • 收稿日期:  2016-03-08
  • 网络出版日期:  2016-05-20
通讯作者: 陈斌, bchen63@163.com
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