Volume 57, Issue 46 pp. 15194-15198
Communication

Grouping Effect of Single Nickel−N4 Sites in Nitrogen-Doped Carbon Boosts Hydrogen Transfer Coupling of Alcohols and Amines

Hui Su

Hui Su

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Peng Gao

Peng Gao

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Meng-Ying Wang

Meng-Ying Wang

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Guang-Yao Zhai

Guang-Yao Zhai

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Jun-Jun Zhang

Jun-Jun Zhang

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Tian-Jian Zhao

Tian-Jian Zhao

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Juan Su

Juan Su

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Prof. Markus Antonietti

Prof. Markus Antonietti

Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Potsdam-Golm Science Park, 14476 Potsdam, Germany

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Prof. Xin-Hao Li

Corresponding Author

Prof. Xin-Hao Li

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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Prof. Jie-Sheng Chen

Corresponding Author

Prof. Jie-Sheng Chen

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China

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First published: 25 September 2018
Citations: 53

Graphical Abstract

Herd instinct: A grouping effect is observed for single Ni−N4 sites in a Ni catalyst supported by nitrogen-doped carbon (NC). A high 9.5 wt % Ni content was achieved with a ligand-stabilized polycondensation method. An enhanced electron density effect manifests at each single Ni−N4 site, which decreases the binding energy of H radicals to Ni and promotes efficient coupling of benzyl alcohol and aniline to form N-benzylaniline.

Abstract

As a new type of heterogeneous catalyst with “homogeneous-like” activity, single-site transition-metal materials are usually treated as integrated but separate active centers. A novel grouping effect is reported for single Ni−N4 sites in nitrogen-doped carbon (Ni/NC), where an effective ligand-stabilized polycondensation method endows Ni/NC nanocatalysts with a high content of single-site Ni up to 9.5 wt %. The enhanced electron density at each single Ni−N4 site promotes a highly efficient hydrogen transfer, which is exemplified by the coupling of benzyl alcohol and aniline into N-benzylaniline with a turnover frequency (TOF) value of 7.0 molN-benzylaniline molmetal−1 h−1; this TOF outpaces that of reported stable non-noble-metal-based catalysts by a factor of 2.

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