摘要
利用超重力技术将具有相同表面电荷的两种材料铂纳米粒子与二氧化钛纳米粒子组装成了铂-二氧化钛复合物。元素分析结果表明,与自然吸附法相比,超重力法所得金属铂的负载量由0.13%上升为0.83%。超重力技术所制得的纳米复合物比常规法制备所得催化剂对硝基苯加氢具有更高的催化加氢活性,其活性由0.48s~(-1)升高至0.79s~(-1)。该结果表明,超重力条件下得到的纳米复合物中铂与二氧化钛有更强的金属-载体相互作用;同时,超重力技术所得纳米复合物具有更高的催化性能稳定性,其周转数达到40000r时,硝基苯转化率仍可达96%以上,高于常规法所得催化剂上硝基苯的转化率(92%)。
The Pt-TiO_2 nanocomposites were fabricated from Pt nanoparticles and TiO_2 nanoparticles with the same surface charges via supergravity technology.The elemental analysis results revealed that the loading percentage of Pt(0.83%)on TiO_2 via supergravity technology was higher than that via natural adsorption(0.13%).The catalytic hydrogenation activitie(0.79 s~(-1))over the nanocomposites prepared with supergravity technology were higher than that with regular method(0.48 s~(-1)),revealing the stronger metal-support interaction between Pt and TiO_2 via supergravity condition than that via regular method.Meanwhile,the nanocomposites prepared with supergravity technology had higher catalytic stability than that prepared with regular method.When the turnover number reached 40000,the conversion of nitrobenzene can remain up to 96%,which is higher than that on the catalyst prepared with regular method(92%).
引文
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