Oxidative Degradation of Trichloroethylene over Fe2O3-doped Mayenite: Chlorine Poisoning Mitigation and Improved Catalytic Performance

Abstract

Mayenite was recently successfully employed as an active catalyst for trichloroethylene (TCE) oxidation. It was effective in promoting the conversion of TCE in less harmful products (CO2 and HCl) with high activity and selectivity. However, there is a potential limitation to the use of mayenite in the industrial degradation of chlorinated compounds—its limited operating lifespan owing to chlorine poisoning of the catalyst. To overcome this problem, in this work, mayenite-based catalysts loaded with iron (Fe/mayenite) were prepared and tested for TCE oxidation in a gaseous phase. The catalysts were characterized using different physico-chemical techniques, including XRD, ICP, N2-sorption (BET), H2-TPR analysis, SEM-EDX, XPS FESEM-EDS, and Raman. Fe/mayenite was found to be more active and stable than the pure material for TCE oxidation, maintaining the same selectivity. This result was interpreted as the synergistic effect of the metal and the oxo-anionic species present in the mayenite framework, thus promoting TCE oxidation, while avoiding catalyst deactivation.

Sustainable and Environmental Catalysis

“…Mayenite loaded with 2% iron was found to be the best catalyst in terms of T 50 (300 • C). This result was correlated with an optimum combination of the oxidative properties of the mayenite active support with the redox properties of iron, as Temperature Programmed Reduction (TPR), X-ray photoelectron spectroscopy (XPS) and Raman results have shown [14].…”

The fascinating world of mayenite (Ca12Al14O33) and its derivatives

“…As can be seen, mayenite loaded with the maximum amount of Fe (2.0%) was found to be the best catalyst synthesized for the TCE oxidation reaction. This result was related to the strong interaction between the transition metal with the mayenite framework, which enhanced the catalytic performance of the material (Cucciniello et al 2019).…”

A Review on the Catalytic Hydrogenation of Bromate in Water Phase

“…It has been successfully used for the removal of some air pollutants as NO x , VOCs etc. [1][2][3][4][5][6][7][8]. Nevertheless, the use of catalysis for the control of water pollutants is more complicated because catalysts must be stable in order to avoid leaching to water and must be active at room temperature and atmospheric pressure in order to be economically viable.…”