共被期刊论文引用了2次
您的检索式：您选中1篇文献正在查看引证文献汇总
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 环境扫描透射电子显微镜原位揭示氢溢流促进TiO_(2)体缺陷修复机理显示文摘负载型纳米催化剂的缺陷是决定其催化性能的一个关键因素。但由于缺少外场环境下原子尺度的缺陷动态结构信息,精确调控材料中的晶体缺陷依然极富挑战性。本工作利用原位球差校正环境扫描透射电子显微镜(ESTEM)研究了Pd⁃TiO_(2)催化剂中TiO_(2)载体结构在不同气氛下的动态演变,原位观察了TiO_(2)载体中纳米级空洞结构在600℃氢气气氛下的消失行为。结合H_(2)程序升温还原(H_(2)⁃TPR)、X射线衍射(XRD)、电子顺磁共振(EPR)和X射线光电子能谱(XPS)等谱学表征,揭示了氢气气氛下Pd⁃TiO_(2)催化剂的结构演变机制。研究发现,高温氢气环境下Pd⁃TiO_(2)表面的氢溢流导致TiO_(2)载体上产生了大量的氧空位(V_(O))并被负价Pd离子稳定,高浓度V_(O)促进了TiO_(2)载体中离子扩散,极大促进了具有高表面能的纳米级空洞的消失。 | 夏怡泽 欧阳 王飞 袁文涛 杨杭生 张泽 王勇 | 2022 | 电子显微学报2022，41，4： | 3 |
| 2 | The proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2) single-atom catalysts显示文摘The local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).However,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional support.Herein,we prepared two Rh1/CeO_(2)SACs(0.5Rh1/r-CeO_(2)and 0.5Rh1/c-CeO_(2),respectively)using two shaped CeO_(2)(rod and cube)exposing different facets,i.e.,CeO_(2)(111)and CeO_(2)(100).In CO oxidation reaction,the T100 of 0.5Rh1/r-CeO_(2)SACs is 120°C,while the T100 of 0.5Rh1/c-CeO_(2)SACs is as high as 200°C.Via in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),we found that the proximity between OH group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2)SAC system in CO oxidation.The Rh single atom trapped at the CeO_(2)(111)crystal surface forms the Rh1(OH)adjacent species,which is not found on the CeO_(2)(100)crystal surface at room temperature.Furthermore,during CO oxidation,the OH group far from Rh single atom on the 0.5Rh1/c-CeO_(2)disappears and forms Rh1(OH)adjacent species when the temperature is above 150°C.The formation of Rh1(OH)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2)planes.The formed Rh1(OH)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°C.Density functional theory(DFT)calculations validate the unique activity and reaction path of the intermediate Rh1(OH)adjacentCO species formed.This work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis. | Danfeng Wu Shuyun Zhou Congcong Du Juan Li Jianyu Huang Hong-xia Shen Abhaya K.Datye Shan Jiang Jeffrey T.Miller Sen Lin Haifeng Xiong | 2024 | Nano Research2024，17，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员