Size-selective hydrogenation at the subnanometer scale over platinum nanoparticles encapsulated in silicalite-1 single crystal hollow shells.

Highly controlled "ship-in-a-bottle" platinum nanoparticles in silicalite-1 hollow single crystals have been prepared. This catalyst is highly active for toluene hydrogenation but shows no activity for the hydrogenation of 1,3,5-trimethylbenzene.