Abstract
Structured Fe-ZSM-5 zeolite supported on silicon carbide (SiC) foam catalyst was develop and applied as the packed foam bed catalytic reactor (FBCR) to the liquid phase catalytic wet peroxide oxidation (CWPO) of phenol under flow conditions. Fe catalysts were uniformly incorporated into ZSM-5 coatings using chemical vapour deposition (CVD). Fluid flow analysis of FBCR was performed by varying liquid flow rate, showing the transition of reactor type from the plug flow reactor to the continuous stirred tank reactor at about 1 ml min−1. Systematic investigation of CWPO within Fe-ZSM-5/SiC FBCRs identified the optimum condition of operating the FBCR (80 mm bed length) as at 60 °C and 1 ml min−1 with the turnover frequency (TOF) of 95 h−1 for phenol degradation (apparent activation energy = 3.4 kJ mol−1) and total organic carbon (TOC) conversion of 45.5%. It was believed that the enhanced macromixing promoted by cellular foam supports was accountable for the observed catalytic performance. The longevity of FBCR under flow conditions was also assessed, showing its good stability over 24 h, as well as the potential for practical adoption.
Highlights
The increasing industrial activity of modern society has raised issues concerning environmental pollution
Fe (0.2 wt%) supported on ZSM-5/silicon carbide (SiC) catalysts were prepared by chemical vapour deposition (CVD) with good dispersion of Fe2O3 in the ZSM-5 coating
For Catalytic wet peroxide oxidation (CWPO) catalysed by Fe-ZSM-5/SiC foam bed catalytic reactor (FBCR), conversions of H2O2 and phenol stabilised at between 15 and 60 min after the start-up of the system and remained on same levels for the continuous run
Summary
The increasing industrial activity of modern society has raised issues concerning environmental pollution. ZSM-5 zeolite was employed to support iron (Fe) catalysts for CWPO of phenol [5,8,20,21,22,23,24,25] due to its high specific surface area Solid open-cell cellular foams (based on base materials of polyurethane, carbon [37,38] and silicon carbide, SiC [39]) were proposed to develop flow-through reactors for environmental catalytic applications, especially photocatalytic treatment of chemical and biological pollutants in gas or liquid phase. Fe-ZSM-5/SiC catalyst is used as the foam bed catalytic reactors (FBCRs) and assessed by CWPO with phenol as the model compound under laminar flow conditions. The longevity of the developed catalytic system is evaluated as well to assess the catalytic FBCRs for potential practical applications
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