The Luong Nguyen, Okumura Hideyuki, Yamasue Eiji, Ishihara Keiichi N
Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
R Soc Open Sci. 2019 Feb 6;6(2):181861. doi: 10.1098/rsos.181861. eCollection 2019 Feb.
The aim of this study is to prepare CuO-CeO composite by means of mechanical milling and to investigate its characteristics as a catalyst. The structural and morphological features of milled samples are observed by X-ray diffractometry and scanning electron microscopy. The redox property and total OSC (oxygen storage capacity) of the milled sample were measured by using GC-TCD and TG-DTA, which are important parameters to indicate the effectiveness of catalysts. Interestingly, reduction of CuO is repeatedly observed when milling of CuO-CeO powder mixture is processed in air. The redox property of milled CuO-CeO sample is investigated by H-TPR, where three reduction peaks are observed for 0 h milling and only one broad peak for various other milling times. The total OSC of mechanically driven CuO-CeO catalyst is much higher than that of the CeO-ZrO traditional catalyst system at low temperatures.
本研究的目的是通过机械研磨制备CuO-CeO复合材料，并研究其作为催化剂的特性。通过X射线衍射和扫描电子显微镜观察研磨样品的结构和形态特征。使用GC-TCD和TG-DTA测量研磨样品的氧化还原性能和总氧储存容量（OSC），这是表明催化剂有效性的重要参数。有趣的是，当在空气中对CuO-CeO粉末混合物进行研磨时，会反复观察到CuO的还原。通过H-TPR研究研磨后的CuO-CeO样品的氧化还原性能，其中在研磨0小时时观察到三个还原峰，而在其他不同研磨时间仅观察到一个宽峰。在低温下，机械驱动的CuO-CeO催化剂的总OSC远高于CeO-ZrO传统催化剂体系。
