Abstract
Open-cell foams have been accepted as one of the most promising substrates in immobilized photoreactors due to high mass transfer efficiency and large specific area but did not show a significant advantage over other substrates. A real-geometry-based computational fluid dynamic model of the photoreactor packed with idealized restructured β-SiC foams for the gas-phase photodegradation of methylethylketone (MEK) using the rutile TiO2 thick film is proposed to clarify the unanticipated inferior performance quantitatively. The difference in transparency of the substrate is demonstrated as the origin of inferior performance that the MEK conversion ratio with glass foams is 30.5% and 25.98% higher than those with opaque foams and with glass Raschig rings, respectively. Moreover, the semi-transparent substrate breaks through the limitation of the photoactivity with the foams of high cell density, that the MEK conversion could reach 11.1% when ρc = 45 ppi, improved by approximately 183% when compared to the opaque samples.
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