Catalyzed supercritical water oxidation of acetic acid: Kinetics and anatase behavior.

摘要

The efficiency of the supercritical water oxidation (SCWO) process depends on the fate of thermally stable oxidation byproducts, such as acetic acid. This research investigated the use of anatase (TiO;Anatase was an effective catalyst. Temperature, residence time, acetic acid concentration, and catalyst exposure time (age) influenced the oxidation rate of acetic acid. Kinetic data were collected and modelled. The initial oxygen concentration did not significantly impact the modelled rate of reaction; thus, it was left out of the rate equation. The following rate equation provided the best fit to 35 kinetic data points;Catalyst samples were characterized in order to relate catalyst properties to transient conversion. Under SCWO conditions, the anatase particles were sintered. Within 200 minutes of exposure time, particle surface areas decreased from 40 m