Adsorption and surface reactions of C_(2)H_(2) and C_(2)H_(4) on Co(0001)  

作　　者：Lingshun Xu Zongfang Wu Haocheng Wang Junjie Shi Zichen Li Weixin Huang 

机构地区：[1]Key Laboratory of Precision and Intelligent Chemistry,Hefei National Research Center for Physical Sciences at the Microscale,iChEM,Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes,Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,P.R.China [2]Anhui Huishu Iot Technology Co.,LTD,Hefei 230601,P.R.China

出　　处：《Surface Science and Technology》2023年第1期66-73,共8页表面科学技术(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant number U1930203).

摘　　要：In this paper we have studied adsorption and surface reactions of acetylene and ethylene on Co(0001)in detail by temperature desorption spectrum(TDS),X-ray photoelectron spectroscopy(XPS)and ultraviolet photoelectron spectroscopy(UPS).C_(2)H_(4) adsorption at 130 and 300 K followed by subsequent heating mainly forms C_(2) clusters and graphitic carbon,respectively,while C_(2)H_(4) decomposes at 400 and 500 K to form dominant graphitic carbon and carbon adatoms,respectively.C_(2)H_(2) molecularly adsorbs at 130 K but exclusively dehydrogenates upon heating.The resulting C_(2)H_(2)(a)species at low coverages remains stable up to 400 K and then exclusively dehydrogenates into C_(2) clusters,while the resulting C_(2)H_(2)(a)species at high coverages remains stable up to 310 K and then majorly dehydrocyclizates into(C_(2)H)n intermediates with ring structures at 340 K which further dehydrogenates into graphitic carbon,and minorly dehydrogenates into C_(2) clusters.Exposed at 370 K,C_(2)H_(2) dehydrocyclizates into(C_(2)H)n intermediates with ring structures.These temperature and coverage dependent surface reactions of C_(2)H_(2) and C_(2)H_(4) on Co(0001)greatly enrich our fundamental understanding of Co-catalyzed F-T synthesis reaction.

关 键 词：Surface chemistry Fischer-Tropsch synthesis Graphene growth COBALT Reaction mechanism 

分 类 号：O64[理学—物理化学]