Welcome to Deng Feng Group Website.
您当前的位置:首页 > News

The Role of Adsorbed Species in 1-Butene Isomerization: Parahydrogen-Induced Polarization NMR of Pd–Au Catalyzed Butadiene Hydrogenation

 Date:2024/3/12 9:58:32 Views:Times


Isomerization of 1-butene critically influences product distributions in 1,3-butadiene hydrogenation. However, distinguishing between the isomerization and hydrogenation pathways is challenging. Here, we employ parahydrogen-induced polarization (PHIP) NMR spectroscopy to determine the extent of the isomerization pathway when using Pd–Au bimetallic nanoparticles synthesized via a colloidal protocol in the presence or absence of a polyvinylpyrrolidone (PVP) stabilizing ligand and immobilized on TiO2. Residual additives, in particular, sulfur, are observed to considerably influence the pairwise hydrogenation and 1-butene isomerization pathways. PHIP NMR analysis reveals that the PVP ligand can induce strong polarized signals, likely due to restricted proton migration, but minimally impact 1-butene isomerization. In contrast, removing surface sulfur species introduced during catalyst synthesis profoundly enhances 1-butene isomerization by reducing the hydrogen concentration at the nanoparticle surface. This work elucidates how residual species can modulate key reaction pathways such as isomerization during 1,3-butadiene hydrogenation, with implications for rational catalyst design.


中国科学院精密测量科学与技术创新研究院 (中国科学院武汉物理与数学研究所) 邓风课题组
地址:武汉市武昌小洪山西30号 电话:027-87199543 邮政编码:430071