Gas-phase micro-solvation within zeolite confinement accelerates hydrogen isotope exchange.

A gas-phase micro-solvation strategy is proposed to resolve the gas-liquid kinetic dilemma in hydrogen isotope exchange. Exploiting Pt@zeolite spatial confinement, trace water is precisely trapped to assemble localized interfacial water bridges. These confined networks act as dynamic proton shuttles, elegantly delocalizing severe charge polarization and slashing the spillover barrier to profoundly accelerate the reaction.