Abstract
Abstract This work presents a modeling procedure for a tall photocatalytic fluidized bed photoreactor used for the photocatalytic oxidation of n-hexane on the anatase TiO2 surface. The modeling strategy split the reactor into two parts: a lower dense phase, with high solids concentration behaving as a bubbling bed treated as a continuous stirred tank reactor (CSTR); and an upper lean phase of low solids concentration behaving as a plug-flow reactor (PFR). The Langmuir-type kinetic parameters were obtained for the flow rate of 1.67 × 10-4 m3 s-1 and catalyst mass of 0.1 kg. The model revealed a good adjustment with experimental data when predicting conversion results for the same experimental conditions, but deviations grew as flow rates and catalyst loads departed from those values in which the model was obtained.
Highlights
Environmental protection agencies all over the world are strengthening laws related to atmospheric emissions of volatile organic compounds (VOC) (Assadi et al, 2014)
Once placed inside the photoreactor and submitted to enough drag force, given some time required for pressure stabilization, the solids reorganize as millimetric spherical TiO2 agglomerates due to cohesive interparticle forces, as suggested by the photographs in Figure 5, which compare the solids before and after operation at an air flow rate of 10 L min-1
A kinetic model based on the determination of kinetic parameters in a fluidized bed photoreactor using Langmuir-Hinshelwood kinetics for n-hexane degradation was developed
Summary
Environmental protection agencies all over the world are strengthening laws related to atmospheric emissions of volatile organic compounds (VOC) (Assadi et al, 2014). Fifty percent (50%) of these are volatile organic compounds (VOC). Under Brazilian laws, Conselho Nacional do Meio Ambiente (CONAMA) has given VOC a definition in 2006 by Resolution 382/2006: “organic compounds at boiling point 130 oC or lower when exposed to atmospheric pressure, can contribute to the formation of photochemical oxidants”. It did not stipulate emission limits, though. In 2009, the Plano Nacional de Qualidade do Ar (PNQA) brought a project to quantify local emissions of VOC in order to identify critical areas
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