Duan Lianjie, Liu Huan, Muhammad Yaseen, Shi Liyi, Wu Haocheng, Zhang Jianping, Yu Dongqi, Huang Lei
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, P. R. China.
Nanoscale. 2019 Apr 25;11(17):8160-8169. doi: 10.1039/c8nr08731h.
Exploration of effective metal/support combinations and new fabrication approaches is attractive in the catalytic oxidation of HCHO. In this study, we proposed graphitic carbon nitride (g-C3N4) as a non-metal oxide based support to co-load Pt and MnOx through room-temperature photodeposition and in turn applied for HCHO oxidation. Here, Pt was the active component, while MnOx was the cocatalyst to compensate the shortage of active oxygen on g-C3N4. g-C3N4 was found as a promising support for the high dispersion of Pt and MnOx. Well dispersed Pt nanoparticles with an average diameter of 1.8 nm were obtained, which were highly favorable for the loading of MnOx as MnOx-Pt/g-C3N4. Catalytic performance results indicated that the limited HCHO conversion over g-C3N4 and Pt/g-C3N4 was significantly promoted with the introduction of MnOx, with an optimum MnOx amount of 3.0 wt%. The developed catalysts remained highly stable for 30 h. The enhanced catalytic activity of MnOx-Pt/g-C3N4 was due to the increased number of active oxygen species with the introduction of MnOx and the efficient transfer of electrons from g-C3N4 to Pt. Compared to the traditional impregnation, photodeposition process avoids the application of H2 and high temperatures, scoring in favor of its green and safe nature. This study can concomitantly provide a new way for the design and fabrication of a non-metal oxide based support for the efficient HCHO catalytic oxidation and the application of the photocatalytic process in catalyst fabrication.
探索有效的金属/载体组合和新的制备方法在甲醛催化氧化中具有吸引力。在本研究中，我们提出将石墨相氮化碳（g-C3N4）作为一种基于非金属氧化物的载体，通过室温光沉积法共负载Pt和MnO x，进而应用于甲醛氧化。在此，Pt是活性组分，而MnO x是助催化剂，用于弥补g-C3N4上活性氧的不足。发现g-C3N4是Pt和MnO x高度分散的有前景的载体。获得了平均直径为1.8 nm的分散良好的Pt纳米颗粒，这非常有利于MnO x负载形成MnO x-Pt/g-C3N4。催化性能结果表明，引入MnO x后，g-C3N4和Pt/g-C3N4上有限的甲醛转化率得到显著提高，最佳MnO x含量为3.0 wt%。所制备的催化剂在30 h内保持高度稳定。MnO x-Pt/g-C3N4催化活性的增强归因于引入MnO x后活性氧物种数量的增加以及电子从g-C3N4到Pt的有效转移。与传统浸渍法相比，光沉积过程避免了使用氢气和高温，具有绿色安全的优势。本研究可为设计和制备用于高效甲醛催化氧化的基于非金属氧化物的载体以及光催化过程在催化剂制备中的应用提供一条新途径。
