Yang Tianxing, Ma Rui, Li Jiale, Liu Yanan, Feng Junting, He Yufei, Li Dianqing
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Department of Materials and Chemical Engineering, Lianyungang Technical College, Lianyungang, Jiangsu 222006, China.
Fundam Res. 2022 Apr 28;4(5):1147-1156. doi: 10.1016/j.fmre.2022.04.012. eCollection 2024 Sep.
Propane dehydrogenation (PDH) is an efficient technology for the direct production of propylene. Nevertheless, current PDH catalysts mainly rely on precious Pt or toxic Cr and especially undergo severe coke deposition. Herein, we report a Ru catalyst decorated by boron species (Ru-3B/AlO), which exhibits high catalytic performance for PDH. HAADF-STEM, EELS, and CO-FTIR characterization are used to identify the surface structure of the Ru active component, which shows that the high-energy unsaturated coordination sites, including corners, edges and step atoms for Ru-3B/AlO are appropriately modified by BO species. The encapsulation of high-energy active sites prone to C-C cracking and deep dehydrogenation leads to higher propylene selectivity (> 95%) and strong carbon resistance ( 0.0007 min) over Ru-3B/AlO. The XPS and H-TPR results show that the migration of B species is driven by the reduction of BO to BO and that the coating degree of Ru particles is controlled by the chemical valance of Ru species.
丙烷脱氢（PDH）是一种直接生产丙烯的高效技术。然而，目前的PDH催化剂主要依赖于贵金属Pt或有毒的Cr，并且特别容易发生严重的积炭。在此，我们报道了一种由硼物种修饰的Ru催化剂（Ru-3B/AlO），其对PDH表现出高催化性能。使用高角度环形暗场扫描透射电子显微镜（HAADF-STEM）、电子能量损失谱（EELS）和一氧化碳傅里叶变换红外光谱（CO-FTIR）表征来确定Ru活性组分的表面结构，结果表明Ru-3B/AlO的高能不饱和配位位点，包括角、边和台阶原子，被BO物种适当修饰。高能活性位点的封装易于发生C-C裂解和深度脱氢，这使得Ru-3B/AlO具有更高的丙烯选择性（>95%）和强抗炭性能（0.0007分钟）。X射线光电子能谱（XPS）和氢气程序升温还原（H-TPR）结果表明，B物种的迁移是由BO还原为BO所驱动的，并且Ru颗粒的包覆程度由Ru物种的化学价态控制。
