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Alongside TiO 2 , Magneli-phase titanium suboxide having the composition of Ti  n  O 2 n -1 is a kind of attractive functional materials composed of titanium. However, there still remain problems to be overcome in the synthesis of titanium suboxide; the existing synthesis methods require high temperature typically over 1000 °C and/or postsynthesis purification. This study presents a novel approach to synthesis of titanium suboxide nanoparticles through solid-phase reaction of TiO 2 with TiH 2 . Crystal phases of titanium suboxide were easily controlled by changing TiO 2 /TiH 2 molar ratios in a TiO 2 -TiH 2 mixed precursor, and a series of titanium suboxide nanoparticles including Ti 2 O 3 , Ti 3 O 5 , Ti 4 O 7 , and Ti 8 O 15 were successfully obtained. The reaction of TiO 2 with TiH 2 proceeded at a relatively low temperature due to the high reactivity of TiH 2 , giving titanium suboxide nanoparticles without any postsynthesis purification. Ti 2 O 3 nanoparticles and TiO 2 were applied as solid acid catalysts for reaction of furfural with 2-propanol. Ti 2 O 3 showed a high catalytic activity and high selectivity for acetalization of furfural, while TiO 2 showed only poor activity for transfer hydrogenation of furfural. The difference in catalytic properties is discussed in terms of the acid properties of Ti 2 O 3 and TiO 2 .

Magneli-Phase Titanium Suboxide Nanocrystals as Highly Active Catalysts for Selective Acetalization of Furfural