Egg-like magnetically immobilized nanospheres： A long- lived catalyst model for the hydrogen transfer reaction in a continuous-flow reactor  

作　　者：Yongjian Ai Zenan Hu Zixing Shao Li Qi Lei Liu Junjie Zhou Hongbin Sun Qionglin Liang 

机构地区：[1]Department of Chemistry, Northeastern University, Shenyang 770879, China [2]Department of Chemistry, Tsinghua University, Beijing 100084, China

出　　处：《Nano Research》2018年第1期287-299,共13页纳米研究（英文版）

摘　　要：A novel egg-like nanosphere was designed as a long-lived catalyst and is described as [e-mail]2O3@mSiO2. The catalyst was prepared using a modified Stober method with template-free surface-protected etching. The catalyst particle consists of a magnetic Fe3O4 core as the ＂yolk＂, an inner silica shell bearing active Fe2O3＂xBi2O3 species as the ＂egg white＂, and outer mesoporous silica as the ＂egg shell＂. It exhibits an excellent performance in the catalytic reduction of nitro aromatics to corresponding anilines in a fixed-bed continuous-flow reactor. The reaction could be performed at 80 ~C and could reach complete conversion in less than I rain with only a 7% excess of hydrazine hydrate. The catalyst bed could be easily shifted between different substrates without cross-contamination because of the uniformity of the catalyst particles. This catalyst exhibited very good stability in the continuous-flow protocol. In the long-term reduction of p-nitrophenol with 0.5 mmol.min-1 productivity, it worked for more than 1,500 cycles without any catalytic activity loss.A novel egg-like nanosphere was designed as a long-lived catalyst and is described as [e-mail]2O3@mSiO2. The catalyst was prepared using a modified Stober method with template-free surface-protected etching. The catalyst particle consists of a magnetic Fe3O4 core as the ＂yolk＂, an inner silica shell bearing active Fe2O3＂xBi2O3 species as the ＂egg white＂, and outer mesoporous silica as the ＂egg shell＂. It exhibits an excellent performance in the catalytic reduction of nitro aromatics to corresponding anilines in a fixed-bed continuous-flow reactor. The reaction could be performed at 80 ~C and could reach complete conversion in less than I rain with only a 7% excess of hydrazine hydrate. The catalyst bed could be easily shifted between different substrates without cross-contamination because of the uniformity of the catalyst particles. This catalyst exhibited very good stability in the continuous-flow protocol. In the long-term reduction of p-nitrophenol with 0.5 mmol.min-1 productivity, it worked for more than 1,500 cycles without any catalytic activity loss.

关 键 词：magnetically immobilized CONTINUOUS-FLOW egg-like catalytic reduction nitro compounds 

分 类 号：TQ125.116[化学工程—无机化工] TU991.21[建筑科学—市政工程]