Effect of Surface Oxygen on Dissociation of Methane on Cu(100)  

Cu(100)表面氧对甲烷解离的影响

作　　者：Fengqi Lv Yuanjie Xu Yong-Wang Li Xin Yu Yong Yang 吕风琦;许远;李永旺;于欣;杨勇(中国科学院煤炭化学研究所煤转化国家重点实验室,太原030001;国家煤制油能源中心,中科合成油技术股份有限公司,北京101400;中科合成油技术股份有限公司,北京101407;中国科学院大学,北京100049;福州大学化学学院分子催化与原位/操作研究所,福州350108)

机构地区：[1]State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan030001,China [2]SynCat@Bejing,Synfuels China Technology Co.Ltd.,Bejing 101407,China [3]National Energy Center for Coal to Liquids,Synfuels China Co.,Ltd.,Beijing 101400,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Institute of Molecule Catalysis and In-Situ/Operando Studies,College of Chemistry,Fuzhou University,Fuzhou350108,China

出　　处：《Chinese Journal of Chemical Physics》2024年第5期627-631,I0100,共6页化学物理学报（英文）

基　　金：This work is supported by the National Key R&D Program of China(No.2022YFB4101201);the Na-tional Natural Science Foundation of China(No.21972162).

摘　　要：Clean and O-(2√2×√2)R45°Cu(100) surfaces were prepared to study the impact of surface oxygen on the activation of methane dissociation.Auger electron spectroscopy,low energy electron diffraction,infrared reflection absorption spectroscopy,scanning tunneling microscope,and a quadrupole mass-spectrometer for temperature programmed desorption were used to explore the behavior of CH_(4) on the two surfaces.The dissociative adsorption of CH_(4) was observed on oxygen-pre-covered Cu(100) but not on the clean surface indicating surface oxygen promotes the dissociation of the C-H bond.This study can be a reference for the conversion of methane into other high-value-added products with high efficiency and low energy consumption.本文在超高真空体系中制备了干净的Cu(100)表面和O-(2√2×√2)R45°Cu(100)表面,以研究表面氧对甲烷解离活化的影响,使用俄歇电子能谱、低能电子衍射、红外反射吸收光谱、扫描隧道显微镜、程序升温脱附(四极质谱仪)等表征手段,探究甲烷在这两种表面上的吸附活性。结果发现只有在氧预覆盖的Cu(100)表面上观察到了甲烷的解离吸附,而在清洁表面上则没有观察到,这表明表面氧促进了甲烷C一H键的活化解离.这项研究可为高效、低能耗地将甲烷转化为其他高附加值产品提供参考.

关 键 词：OXYGEN DISSOCIATION METHANE CU 

分 类 号：O64[理学—物理化学]