Transformation of titanium carbide into mesoporous titania for catalysed HBr oxidation

Abstract

TiC oxidises via a combination of spot-oxidation and shrinking core mechanisms, resulting in a mesoporous, high-performance TiO2–TiC composite for bromine production via catalysed HBr oxidation.

NMR Signatures and Electronic Structure of Ti Sites in Titanosilicalite-1 from Solid-State 47/49Ti NMR Spectroscopy

“…Due to close gyromagnetic ratios, NMR signals from 47 Ti and 49 Ti usually overlap, which further complicates analysis . To date, 47/49 Ti ssNMR spectroscopy has been mostly limited to the investigation of bulk materials such as titanium oxides and carbides, − as well as Ti-USY, a favorable zeotype material with only one framework T site, where signal detection was facilitated by high Ti loading (∼20 wt %) . However, analysis of zeolites with industrially relevant Ti loadings (typically 1.5 wt %) and a multitude of available T sites such as TS-1 have previously not been possible.…”

NMR Signatures and Electronic Structures of Ti-sites in Titanosilicalite-1 from solid-state 47/49Ti NMR Spectroscopy

“…24 To this date, 47/49 Ti ssNMR spectroscopy has been mostly limited to the investigation of bulk materials such as titanium oxides and carbides. [25][26][27] One notable exception is the characterization of titanocene chlorides, demonstrating the sensitivity of 47/49 Ti ssNMR parameters to local structure. 24,28 The scope of 47/49 Ti ssNMR has since been expanded through the development of novel pulse sequences and/or the use of dynamic nuclear polarization surface-enhanced NMR spectroscopy (DNS-SENS), 29 which has enabled the detection of Ti surface signals in hydrated TiO2-supported MoO3, albeit necessitating a very high concentration of polarizing agent.…”