价(化学)
电负性
催化作用
金属
化学
Atom(片上系统)
原子轨道
轨道杂交
纳米颗粒
电子结构
结晶学
材料科学
分子轨道
化学物理
分子
纳米技术
计算化学
价键理论
有机化学
计算机科学
嵌入式系统
物理
量子力学
电子
作者
Yin Li,Yuxing Xu,Si Chen,Xianxian Shi,Dangsheng Su,Leilei Wang,Minghui Gu,Botao Teng,Bing Yang,Junling Lu
标识
DOI:10.1002/anie.202406262
摘要
Abstract Single‐atom catalysts (SACs) have recently become highly attractive for selective hydrogenation reactions owing to their remarkably high selectivity. However, compared to their nanoparticle counterparts, atomically dispersed metal atoms in SACs often show inferior activity and are prone to aggregate under reaction conditions. Here, by theoretical calculations, we show that tuning the local electronic structures of metal anchor sites on g‐C 3 N 4 by doping B atoms (BCN) with relatively lower electronegativity allows achieving zero‐valence Pd SACs with reinforced metal‐support orbital hybridizations for high stability and upshifted Pd 4 d orbitals for high activity in H 2 activation. The precise synthesis of Pd SACs on BCN supports with varied B contents substantiated the theoretical prediction. A zero‐valence Pd 1 /BCN SAC was achieved on a BCN support with a relatively low B content. It exhibited much higher stability in a H 2 reducing environment, and more strikingly, a hydrogenation activity, approximately 10 and 34 times greater than those high‐valence Pd 1 /g‐C 3 N 4 and Pd 1 /BCN with a high B content, respectively.
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