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首页> 外文期刊>Journal of porous materials >Preparation of ordered meso/macroporous HPW/titania-silica catalyst for efficient oxidative desulfurization of model fuel
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Preparation of ordered meso/macroporous HPW/titania-silica catalyst for efficient oxidative desulfurization of model fuel

机译：制备有序内消旋/大分子HPW /二氧化钛-二氧化硅催化剂，用于模型燃料的有效氧化脱硫

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摘要

In this study, ordered meso-macroporous titania-silica-polyoxometalate (HPW/SiO2-TiO2) material was prepared in one-pot by evaporation-induced self-assembly (EISA) method, with non-ionic surfactant (P123) and monodisperse polystyrene microspheres applied as co-structure-directing agents. And the oxidative desulfurization (ODS) application of as-synthesized hierarchical nanocomposite materials was tested in model fuel. The characterization results of catalyst suggested that Keggin-type polyoxometalate was successfully incorporated into the ordered meso-macroporous SiO2-TiO2 framework. Moreover, the effect of Lewis acid center of the HPW/SiO2-TiO2 catalyst on ODS process was investigated. The optimum proportion of titanium and silicon ratio on catalyst was found to be 1:1, which exhibited remarkable catalytic performance on aromatic sulfur compounds at mild conditions. It revealed that Lewis acid sites played an important role in selectively adsorb DBT and its derivatives. What's More, the combination of Lewis acid sites and ordered meso/macroporous architecture of catalyst will further facilitated the mass transport in ODS process. No decrease in the activity was observed after six runs, indicating a good stability of as-prepared catalyst.
机译：本研究通过蒸发诱导自组装（EISA）方法，非离子表面活性剂（P123）和单分散聚苯乙烯一锅法制备了有序的介孔-大孔二氧化钛-二氧化硅-多金属氧酸盐（HPW / SiO2-TiO2）材料微球用作共结构导向剂。并在模型燃料中测试了合成的分级纳米复合材料的氧化脱硫（ODS）应用。催化剂的表征结果表明，Keggin型多金属氧酸盐已成功地掺入到有序的介孔SiO2-TiO2骨架中。此外，研究了HPW / SiO2-TiO2催化剂的路易斯酸中心对ODS工艺的影响。发现催化剂上钛和硅的最佳比例为1：1，在温和条件下对芳族硫化合物表现出显着的催化性能。结果表明路易斯酸位在选择性吸附DBT及其衍生物中起重要作用。而且，路易斯酸位点和催化剂的有序介孔/大分子结构的结合将进一步促进ODS工艺中的物质传输。六次运行后未观察到活性降低，表明所制备的催化剂具有良好的稳定性。

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