调控TiO2纳米管阵列管径以增强负载纳米钯催化剂的Heck反应性能OACHSSCD

The Heck reaction is a pivotal class of high-atom-economy carbon-carbon coupling transforma-tions,where the selection of catalyst is decisive for determining both efficiency and selectivity.To address the mass transfer limitations inherent in heterogeneous catalysis,this study proposes a strategy to enhance the performance of supported palladium catalysts in the Heck reaction by modulating the pore diameter of TiO2 nanotube arrays.Anodic TiO2 nanotube array(ATNTs)supports featuring large pore diameters with inner diameter of about 154 nm were fabricated via a high-voltage stepwise anodization method.Sub-sequently,Pd nanoparticles with an average size of approximately 6.24 nm were uniformly deposited onto the inner and outer walls of the nanotubes using a photochemical reduction technique.In the Heck cou-pling of iodobenzene with methyl acrylate,the as-prepared Pd@ATNTs catalysts exhibited exceptional catalytic activity,achieving complete conversion within 60 minutes with turnover frequency of 409 h-1.Furthermore,the catalyst demonstrated facile recoverability and excellent cyclic stability,maintaining its activity without significant attenuation after six consecutive reaction cycles.