中文标题：La2O3改性的Si基柱撑黏土负载PtOx纳米晶催化剂用于苯的催化燃烧
英文标题：La2O3 modified silica-pillared clays supported PtOx nanocrystalline catalysts for catalytic combustion of benzene
刊物名称及期号、页码：Chem. Eng. J. 2020, DOI: 10.1016/j.cej.2019.123747
作者姓名（中文）：成珍、冯滨滨、陈珠、郑洁、李静、左树锋
作者姓名（英文）：Zhen Cheng, Binbin Feng, Zhu Chen, Jie Zheng, Jing Li, Shufeng Zuo
摘要（英文）：La2O3 modified silica-pillared clays (SPC) was synthesized by a soft template method. Both the basal spacing and the specific surface area increased after pillaring and modification, and the thermal stability was also improved, all of which could reduce the mass transfer resistance and improve the adsorption capacity of benzene. PtOx nanocrystalline catalysts were prepared by a high-temperature liquid reduction method. Among them, the catalyst with 0.2 wt% Pt loading and a La/KSF molar ratio of 0.5:1 (0.2% Pt/LaSPC (0.5:1)) showed the highest catalytic combustion activity and higher CO2 selectivity, and the reaction temperature for benzene combustion was about 200 °C. Besides, the Pt0, Pt2+ and Pt4+ with particle sizes of about 3–5 nm coexisted on the surface of LaSPC (0.5:1). And this catalyst also exhibited good stability during the 100 h continuous reactions at 195 °C. The high dispersion of Pt particles, active oxygen species and strong redox property are responsible for the high activity of 0.2% Pt/LaSPC (0.5:1) for benzene combustion.
工作简介：催化燃烧技术是治理可挥发性有机物（VOCs）的有效手段，而催化剂是催化燃烧的核心。对于气固相催化剂而言，高的比表面积可以促进催化剂对于反应物的吸附，进一步提高催化剂的催化活性。通过前期的工作，本课题组发现将Si元素插入蒙脱土中形成柱撑黏土可以极大的提高材料的比表面积，并且所获得的的柱撑黏土拥有非常优异的热稳定性能，是一种非常优异的催化剂载体材料。基于此，本课题组使用Si基柱撑黏土作为催化剂载体，使用La2O3对Si基柱撑黏土进行改性，最后负载PtOx纳米晶颗粒制备催化剂用于苯的催化燃烧。实验结果显示该催化剂拥有非常优异的催化活性，可以在200℃下完全催化燃烧苯。并且，该催化剂在长达100 h的耐久性测试中表现出长时间的稳定性，说明该催化剂是一种拥有工业应用前景的高活性、高寿命的催化剂。
创新点：使用La2O3改性的Si基柱撑黏土负载PtOx纳米晶催化剂拥有超大的比表面积和孔结构，对于苯的催化燃烧表现出高的活性和耐久性。
全文链接：https://doi.org/10.1016/j.cej.2019.123747
