Understanding the geometric and electronic factors of PtNi bimetallic surfaces for efficient and selective catalytic hydrogenation of biomass-derived oxygenates

• 作者: Jingcheng Wu Chuangwei Liu Yuting Zhu Xiangbo Song Chengyan Wen Xinghua Zhang Chenguang Wang Longlong Ma
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 16-24
• 页数: 9页
• 语种: 英文

摘要

Ni-base catalysts are promising candidate for the hydrogenation of furfural(FAL)to high-value chemicals.However,slow intermediate desorption and low selectivity limit its implementation.Identifying the cat-alytic performance of each active sites is vital to design hydrogenation catalyst,and tuning the geomet-rical sites at molecule level in PtNi could lead to the modification of electronic structure,and thus the selectity for the hydrogenation of FAL was modulated.Herein,PtNi hollow nanoframes(PtNi HNFs)with three dimensional(3D)molecular accessibility were synthesized,EDX results suggested that Ni was evenly distributed inside of the hollow nanoframes,whereas Pt was relatively concentrated at the edges.DFT calculation demonstrated that PtNi significant decrease the desorption energy of the intermediates.This strategy could not only enhance the desorption of intermediates to improve the catalytic perfor-mance,but also transfer the adsorption mode of FAL on catalyst surface to selective hydrogenation of FAL to FOL or THFA.The PtNi HNFs catalyst afforded excellent catalytic performance for selective hydro-genation of a broad range of biomass-derived platform chemicals under mild conditions,especially of FAL to furfuryl alcohol(FOL),in quantitative FOL yields(99％)with a high TOF of 2.56 h-1.It is found that the superior performance of PtNi HNFs is attributed to its 3D hierarchical structure and synergistic electronic effects between Pt and Ni.Besides,the kinetic study demonstrated that the activation energy for hydro-genation of FAL was as low as 54.95 kJ mol-1.