Efficient hydrothermal deoxygenation of methyl palmitate to diesel-like hydrocarbons on carbon encapsulated Ni–Sn intermetallic compounds with methanol as hydrogen donor  

作　　者：Haonan Shi Xiaoyu Gu Yinteng Shi Dandan Wang Sihao Shu Zhongze Wang Jixiang Chen 

机构地区：[1]Tianjin Key Laboratory of Applied Catalysis Science and Technology,Department of Catalysis Science and Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第2期139-155,共17页化学科学与工程前沿（英文版）

摘　　要：Porous carbon-encapsulated Ni and Ni-Sn intermetallic compound catalysts were prepared by the one-pot extended Stöber method followed by carbonization and tested for in-situ hydrothermal deoxygenation of methyl palmitate with methanol as the hydrogen donor.During the catalyst preparation,Sn doping reduces the size of carbon spheres,and the formation of Ni-Sn intermetallic compounds restrain the graphitization,contributing to larger pore volume and pore diameter.Consequently,a more facile mass transfer occurs in carbon-encapsulated Ni-Sn intermetallic compound catalysts than in carbonencapsulated Ni catalysts.During the in-situ hydrothermal deoxygenation,the synergism between Ni and Sn favors palmitic acid hydrogenation to a highly reactive hexadecanal that easily either decarbonylate to n-pentadecane or is hydrogenated to hexadecanol.At high reaction temperature,hexadecanol undergoes dehydrogenation-decarbonylation,generating n-pentadecane.Also,the C-C bond hydrolysis and methanation are suppressed on Ni-Sn intermetallic compounds,favorable for increasing the carbon yield and reducing the H_(2) consumption.The npentadecane and n-hexadecane yields reached 88.1%and 92.8%on carbon-encapsulated Ni_(3) Sn_(2) intermetallic compound at 330℃.After washing and H_(2) reduction,the carbon-encapsulated Ni_(3) Sn_(2) intermetallic compound remains stable during three recycling cycles.This is ascribed to the carbon confinement that effectively suppresses the sintering and loss of metal particles under harsh hydrothermal conditions.

关 键 词：extended Stöber method carbon encapsulated Ni-Sn intermetallic compounds confinement in-situ hydrothermal deoxygenation HYDROGENATION DECARBONYLATION 

分 类 号：TG454[金属学及工艺—焊接]