Potassium promoter regulates electronic structure and hydrogen spillover of ultrasmall Ru nanoclusters catalyst for ammonia synthesis - Details

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Abstract：

The　effects　of　promoters　on　Ru　nanoparticles　(≥2　nm)　catalysts　for　NH3　synthesis　have　been　extensively　elaborated,　but　their　roles　on　ultrasmall　Ru　nanoclusters　(NCs,　1–2　nm)　remain　largely　unknown　and　need　to　be　further　uncovered.　Herein,　a　series　of　K-promoted　MgO　supported　Ru　NCs　were　synthesized　and　investigated　for　NH3　synthesis.　The　addition　of　5wt.%K　onto　Ru/MgO　NCs　leads　to　a　significantly　high　NH3　synthesis　rate　of　21.7　mmolNH3　gcat−1h−1　at　400　°C　and　0.2　MPa,　close　to　the　thermodynamic　equilibrium.　Out　studies　reveal　that　anchoring　K　onto　Ru　NCs　can　increase　the　electron　density　and　cause　an　upshift　of　the　d-band　center　of　Ru　entities.　Moreover,　the　addition　of　K　regulates　the　hydrogen　affinity　and　accelerates　the　migration　of　hydrogen　from　the　Ru　NCs　surface　to　MgO　support,　which　is　crucial　in　avoiding　the　hydrogen　poisoning　effect　on　Ru　NCs.　With　the　synergistic　effect　of　the　Ru　NCs　sites　bridged　by　H-spillover,　makes　the　K-mediated　Ru/MgO　NCs　catalysts　efficient　for　NH3　synthesis　at　mild　conditions.　©　2024　Elsevier　Ltd

Keyword：

Ammonia Electronic structure Hydrogen Magnesia Nanocatalysts Nanoclusters Potassium Ruthenium Synthesis (chemical)

Community：

[ 1 ] [Peng, Xuanbei]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 2 ] [Luo, Yongjin]Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fuzhou; 350007, China
[ 3 ] [Zhang, Tianhua]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 4 ] [Deng, Jinxiu]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 5 ] [Zhou, Yanliang]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 6 ] [Li, Jiaxin]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 7 ] [Ni, Jun]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 8 ] [Lin, Bingyu]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 9 ] [Lin, Jianxin]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 10 ] [Wu, Dongshuang]School of Materials Science, & Engineering College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
[ 11 ] [Zheng, Lirong]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; 100049, China
[ 12 ] [Wang, Xiuyun]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China
[ 13 ] [Jiang, Lilong]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fujian, Fuzhou; 350002, China