催化作用
材料科学
甲醇
石墨烯
浸出(土壤学)
氧化还原
化学工程
基础(拓扑)
无机化学
纳米技术
化学
有机化学
冶金
数学分析
环境科学
数学
土壤科学
工程类
土壤水分
作者
Xiang‐Bin Shao,Z. Xing,Siyu Liu,Ke-Xin Miao,Shi‐Chao Qi,Song‐Song Peng,Xiao‐Qin Liu,Lin‐Bing Sun
标识
DOI:10.1016/j.gee.2023.08.003
摘要
Solid strong base catalysts are highly attractive for diverse reactions owing to their advantages of neglectable corrosion, facile separation, and environmental friendliness. However, their widespread applications are impeded by basic components aggregation and low stability. In this work, we fabricate single calcium atoms on graphene (denoted as Ca1/G) by use of a redox strategy for the first time, producing solid strong base catalyst with high activity and stability. The precursor Ca(NO3)2 is first reduced to CaO at 400 oC by the support graphene, forming CaO/G with conventional basic sites, and the subsequent reduction at 850 oC results in the generation of Ca1/G with atomically dispersed Ca. Various characterizations reveal that Ca single atoms are anchored on graphene in tetra-coordination (Ca-C2-N2) where N is in situ doped from Ca(NO3)2. The atomically dispersed Ca, along with their anchoring on the support, endow Ca1/G with high activity and stability toward the transesterification reaction of ethylene carbonate with methanol. The turnover frequency value reaches 128.0 h-1 on Ca1/G, which is much higher than the traditional counterpart CaO/G and various reported solid strong bases (2.9-46.2 h-1). Moreover, the activity of Ca1/G is well maintained during 5 cycles, while 60% of activity is lost for the conventional analogue CaO/G due to the leaching of Ca.
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