Mesoporous H-ZSM-5 nanocrystals with programmable number of acid sites as 'solid ligands' to activate Pd nanoparticles for C-C coupling reactions

摘要

In this work,we described a proof-of-concept method to promote the activity and selectivity of Pd nanoparticles for heterogeneous catalysis (exemplified by C-C coupling reactions) by using acid sites within a zeolite framework.The Pd nanoparticles were encapsulated inside the crystalline walls of mesoporous H-ZSM-5 leading to hybrid samples (denoted as Pd@mZ-x-H) with controlled number of acid sites.A linear relationship between the number of acid sites of the zeolite nanocrystals and the catalytic activities of the Pd nanoparticles in organic reactions was established.Moreover,the shape-dependent selectivity of Pd@mZ-x-H was not sacrificed when the final activity was enhanced.