Abstract
Nanomesoporous LaAlO3 synthesized by reverse microemulsion method were tested in the catalytic wet air oxidation (CWAO) of phenol in a fixed bed reactor. Synthesized LaAlO3 was characterized in depth by TG-DSC, XRD, FTIR, BET, TEM, TPD-CO2, TPD-NH3, and H2-TPR in order to relate its performances to the chemical and textural characteristics. Nanomesoporous LaAlO3 showed high activity towards phenol and in total organic carbon (TOC) removal with greater selectivity to non-organic compounds, a clear increase in the removal efficiency and selectivity relatively to non-catalytic wet air oxidation being observed. Effect of temperature, catalyst dosage, air flow, and phenol pumping rate in CWAO of phenol was investigated. LaAlO3 displayed high catalytic stability even after 6 h of continued reaction. Structural and textural stability of LaAlO3 was confirmed by XRD and BET surface area analysis of regenerated catalyst. Lewis basic sites and mesoporous nature of nano-LaAlO3 may play an important role in phenol degradation and TOC removal efficiency with high selectivity to non-organic compounds.
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