The confinement of catalysts in carbon nanotubes (CNTs) has attracted increasing attention1'2 because of the well-defined tubular morphology of this type of carbon material. Various types of metal or metal oxide particles have been introduced into CNTs as catalysts.1'2 Up to now, experimental studies on the reaction over the CNT-confined catalysts were limited to MWNTs and no studies on single-wall and double-wall CNTs (SWNTs and DWNTs) have been reported yet. SWNTs and DWNTs. However, it is still a great challenge to uniformly disperse nanoparticles inside SWNTs and DWNTs because of their small diameters. Here, we develop a titania confined within DWNTs system and choose propylene epoxidation reaction as a probe to explore whether titania can be dispersed at a subnanometer scale inside DWNTs and whether confinement can modify its physico-chemical properties.
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