Park Young-Kwon, Nahm Seung Won, Jung Ho-Young, Shim Wang Geun, Jung Sang Chul, Kim Sang Chai
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea.
Department of Environmental Education, Mokpo National University 61, Muan 58554, Korea.
J Nanosci Nanotechnol. 2018 Feb 1;18(2):1487-1491. doi: 10.1166/jnn.2018.14895.
Catalytic oxidation of toluene was carried out to investigate the effect of consecutive run on the catalytic property and performance of 1 wt.% Pt/γ-Al2O3 and the reduced 1 wt.% Pt/γ-Al2O3. The properties were characterized by X-ray diffraction (XRD), the Brunauer Emmett Teller (BET) surface area, temperature programmed reduction (TPR), and transmission electron microscopy (TEM) analyses. In consecutive experiments the second catalytic run resulted in a significant increase of the toluene conversion compared to the first catalytic run, but the toluene conversion in the third catalytic run was similar to that of the second catalytic run. In addition, the reducing treatment of the catalyst led to an increase in the catalytic activity. The increasing catalytic activity in consecutive runs was dependent on the platinum particle size and the oxidation state of the platinum. The increase in platinum particle size during reaction and the reduction in the oxidation state of platinum by hydrogen pretreatment were responsible for the increase in the catalytic activity.
进行甲苯的催化氧化实验，以研究连续运行对1 wt.% Pt/γ-Al₂O₃和还原后的1 wt.% Pt/γ-Al₂O₃催化性能的影响。通过X射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）比表面积、程序升温还原（TPR）和透射电子显微镜（TEM）分析对其性能进行了表征。在连续实验中，与第一次催化运行相比，第二次催化运行导致甲苯转化率显著提高，但第三次催化运行中的甲苯转化率与第二次催化运行相似。此外，催化剂的还原处理导致催化活性增加。连续运行中催化活性的增加取决于铂颗粒尺寸和铂的氧化态。反应过程中铂颗粒尺寸的增加以及氢气预处理导致铂氧化态的降低是催化活性增加的原因。
