Highly active ultrafine Pd NPs confined in imine-linked COFs for nitrobenzene hydrogenation. Issue 11 (27th April 2021)

• Record Type: Journal Article
• Authors: Li, Chunzhi; Ren, Xiaomin; Guo, Miao; Li, Weijian; Li, He; Yang, Qihua
• Is Part Of: Catalysis science & technology. Volume 11:Issue 11(2021)
• Page Start: 3873
• Page End: 3879
• Publication Date: 2021-04-27
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d1cy00129a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Ultrafine Pd NPs with an average size of 1.8 nm were stabilized on an imine-linked COF. The Pd/COF with electron rich surface properties and a high surface area showed high catalytic activity in the hydrogenation of nitrobenzene. Abstract : The preparation and stabilization of ultrafine metal nanoparticles (NPs) are of great importance owing to the enhanced atom efficiency but still remain a challenging issue. Herein, we report that ultrafine Pd NPs with an average size of 1.8 nm could be successfully stabilized on an imine-linked covalent organic framework (COF) even with Pd loadings as high as 5 wt%. The strong interactions of Pd NPs and imine linkage were evidenced by the electron donation from imine linkage to Pd NPs. The Pd/COF catalyst with electron rich surface properties, a high surface area and regular pore channels showed much higher catalytic activity than commercial Pd/C in the hydrogenation of nitrobenzene (TOF: 906 h −1 vs. 507 h −1 ). Furthermore, no aggregation of ultrafine Pd NPs was observed during the recycling process, demonstrating the superiority of imine-linked COFs in stabilizing ultrafine metal NPs.