Crystal Phase Effects on the Gas-Phase Ketonization of Small Carboxylic Acids over TiO₂ Catalysts.

ABSTRACT: The choice of TiO₂ crystal phase (i. e., anatase, rutile, or brookite) greatly influences catalyst performance in the gas-phase ketonization of small volatile fatty acids, such as acetic acid and propionic acid. Rutile TiO₂ was found to perform best, combining superior activity, as exemplified by an exceptional reaction rate of 141.8 mmol h^-1  g_cat ^-1 (at 425 °C and 24 h^-1 ) with excellent ketone selectivity when propionic acid was used. Brookite, to the best of our knowledge never reported before as a viable ketonization catalyst, was found to outperform the well-studied anatase phase, but not rutile. Operando Fourier-transform IR spectroscopy measurements combined with on-line mass spectrometry showed that bidentate carbox

SUBMITTER: Fufachev EV 

PROVIDER: S-EPMC8361664 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature