催化作用
制作
材料科学
化学工程
金属
多孔性
金属有机骨架
纳米技术
化学
有机化学
复合材料
冶金
医学
替代医学
病理
工程类
吸附
作者
Xin Zhao,Ruiqi Fang,Fengliang Wang,Xiangpeng Kong,Yingwei Li
标识
DOI:10.1038/s41467-022-35598-3
摘要
Abstract Single-atom (SA) catalysts provide extensive possibilities in pursuing fantastic catalytic performances, while their preparation still suffers from metal aggregation and pore collapsing during pyrolysis. Here we report a versatile medium-induced infiltration deposition strategy for the fabrication of SAs and hetero-SAs (M a N 4 /M b N 4 @NC; M a = Cu, Co, Ni, Mn, M b = Co, Cu, Fe, NC = N-doped carbon). In-situ and control experiments reveal that the catalyst fabrication relies on the “step-by-step” evolution of M a -containing metal-organic framework (MOF) template and M b -based metal precursor, during which molten salt acts as both pore generator in the MOF transformation, and carrier for the oriented infiltration and deposition of the latter to eventually yield metal SAs embedded on hierarchically porous support. The as-prepared hetero-SAs show excellent catalytic performances in the general synthesis of 33 kinds of natural flavones. The highly efficient synthesis is further strengthened by the reliable durability of the catalyst loaded in a flow reactor. Systematic characterizations and mechanism studies suggest that the superior catalytic performances of CuN 4 /CoN 4 @NC are attributed to the facilitated O 2 activating-splitting process and significantly reduced reaction energy barriers over CoN 4 due to the synergetic interactions of the adjacent CuN 4 .
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