Modifying Interface of Carbon Support-Stimulated Hydrogen Spillover for Selective Hydrogenation
Mingkai Zhang, Yu Sun, Xuemei Han, Wangxing Guo, Ziheng Cheng, Yong Zou, Sai Zhang
Abstract
Hydrogen spillover on heterogeneous catalysts offers a new opportunity to improve catalytic hydrogenation. Due to the slow migration of hydrogen under mild conditions, hydrogen spillover-improved hydrogenation is still unsatisfactory on carbon material-supported metal nanoparticles. Herein, the modifying interface of carbon support-stimulated hydrogen spillover for hydrogenation has been successfully identified on the dual-active sites of Pt nanoparticles and modified carbon black (Pt/C–H2O2). The oxygen-containing-group-modified carbon black, which was achieved by a commonly used H2O2 treatment, not only triggered the efficient hydrogen migration along the carbon supports but also enhanced the adsorption of polar substrates, thus affording simultaneously enhanced catalytic activity and selectivity as well as stability. For probe reaction of 6-chloroquinoline hydrogenation to 6-chloro-1,2,3,4-tetrahydroquinoline, Pt/C–H2O2 catalysts yielded a 6.1 times higher catalytic activity with a high selectivity >99.5% than that on Pt/C with selectivity <96.0%. This work is anticipated to provide a facile and effective methodology for fabricating highly performed hydrogenation heterogeneous catalysts.