TY - JOUR
T1 - Comprehensive adsorption and irradiation modelling of LED driven photoreactor for H2 production
AU - Hojaji, Elaheh
AU - Valant, Matjaz
AU - Axelsson, Anna-karin
PY - 2020/9/3
Y1 - 2020/9/3
N2 - A newly developed hydrogen generation model describing both adsorption and irradiation mechanisms for an externally irradiated 10-LED photoreactor is presented and validated against experimental data. The surface reaction mechanism of the model is based on a pseudo-steady state Langmuir-Hinshelwood kinetic which incorporate the total radiative flux effect. The irradiation mechanism of the model is based on an approximate solution of the Radiative Transport Equation (RTE) together with the derivation of the geometrical positions of the particles in the cross-section of the reactor. This enables calculation of the total visible radiative flux density received by the particles in that area. Integration of the calculated total radiative flux density over the longitudinal reaction depth accounts for the total received photon flux by all particles inside the whole photoreactor. One of the main features of the irradiation mechanism is incorporation of the photocatalyst’s optical scattering and absorption coefficients, which are obtained by the spectrophotometric measurements in the LED output range of 410-500 nm. A least-square best fitting procedure is used to determine the model parameters, where they are successfully validated for a range of photocatalytic H2 experiments conducted at different catalyst loadings, photolyte concentrations, and incident radiation fluxes. The results indicate that the developed model can predict photocatalytic hydrogen production satisfactory with minor computational effort or use of any commercial software. The obtained information provides a coherent framework for the scaling-up and design of the LED-photoreactors.
AB - A newly developed hydrogen generation model describing both adsorption and irradiation mechanisms for an externally irradiated 10-LED photoreactor is presented and validated against experimental data. The surface reaction mechanism of the model is based on a pseudo-steady state Langmuir-Hinshelwood kinetic which incorporate the total radiative flux effect. The irradiation mechanism of the model is based on an approximate solution of the Radiative Transport Equation (RTE) together with the derivation of the geometrical positions of the particles in the cross-section of the reactor. This enables calculation of the total visible radiative flux density received by the particles in that area. Integration of the calculated total radiative flux density over the longitudinal reaction depth accounts for the total received photon flux by all particles inside the whole photoreactor. One of the main features of the irradiation mechanism is incorporation of the photocatalyst’s optical scattering and absorption coefficients, which are obtained by the spectrophotometric measurements in the LED output range of 410-500 nm. A least-square best fitting procedure is used to determine the model parameters, where they are successfully validated for a range of photocatalytic H2 experiments conducted at different catalyst loadings, photolyte concentrations, and incident radiation fluxes. The results indicate that the developed model can predict photocatalytic hydrogen production satisfactory with minor computational effort or use of any commercial software. The obtained information provides a coherent framework for the scaling-up and design of the LED-photoreactors.
KW - Photoreactor modelling; LED irradiation; Langmuir-Hinshelwood kinetics; RTE modelling; Cadmium sulphide
U2 - 10.1016/j.cej.2020.126860
DO - 10.1016/j.cej.2020.126860
M3 - Article
SN - 1385-8947
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -
