Mediating trade-off between activity and selectivity in alkynes semi-hydrogenation via a hydrophilic polar layer.

ABSTRACT: As a crucial industrial process for the production of bulk and fine chemicals, semi-hydrogenation of alkynes faces the trade-off between activity and selectivity due to undesirable over-hydrogenation. By breaking the energy linear scaling relationships, we report an efficient additive-free WO₃-based single-atom Pd catalytic system with a vertical size effect of hydrogen spillover. Hydrogen spillover induced hydrophilic polar layer (HPL) with limited thickness on WO₃-based support exhibits unconventional size effect to Pd site, in which over-hydrogenation is greatly suppressed on Pd₁ site due to the polar repulsive interaction between HPL and nonpolar C=C bonds, whereas this is invalid for Pd nanoparticles with higher altitudes. By further enhancing the HPL

SUBMITTER: Xiong J 

PROVIDER: S-EPMC10858237 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature