TY - JOUR
T1 - Photocatalytic NOx abatement
T2 - mathematical modeling, CFD validation and reactor analysis
AU - Lira, Jessica de O.B.
AU - Padoin, Natan
AU - Vilar, Vitor J.P.
AU - Soares, Cintia
PY - 2019/6/15
Y1 - 2019/6/15
N2 - A 2D CFD model was implemented for the numerical simulation of NO
x abatement in a photocatalytic reactor, considering the effect of relative humidity (10–60%), light intensity (0.3–13 W⋅m
−2) and inlet NO concentration (0.1–1.0 ppm). Significant differences of NO
x concentration at the catalytic surface and bulk gas were found (Δ
max of ∼12% and ∼16% for NO and NO
2, respectively) and corrections were proposed to achieve intrinsic rate laws from a model available in the literature. An analysis of the reactor performance was conducted and a nonlinear behavior was observed when the channel height (H) was varied. A point of maximum for the integral rate of NO and NO
2 consumption as a function of H was found (Δ
NO of ∼2% and ∼-1% for H→2H→4H; Δ
NO
2
of ∼46% and -8.5% for H→2H→4H). Additionally, the NO conversion decreased from ∼29% to ∼7% and the selectivity decreased from ∼85% to ∼80% (passing through a point of minimum at 2H) when the height was varied in the range H-4H. When comparing the results from the CFD simulations and the predictions of a plug flow model, deviations for NO conversion and selectivity increased with H (Δ
max of ∼2% and ∼45%, respectively).
AB - A 2D CFD model was implemented for the numerical simulation of NO
x abatement in a photocatalytic reactor, considering the effect of relative humidity (10–60%), light intensity (0.3–13 W⋅m
−2) and inlet NO concentration (0.1–1.0 ppm). Significant differences of NO
x concentration at the catalytic surface and bulk gas were found (Δ
max of ∼12% and ∼16% for NO and NO
2, respectively) and corrections were proposed to achieve intrinsic rate laws from a model available in the literature. An analysis of the reactor performance was conducted and a nonlinear behavior was observed when the channel height (H) was varied. A point of maximum for the integral rate of NO and NO
2 consumption as a function of H was found (Δ
NO of ∼2% and ∼-1% for H→2H→4H; Δ
NO
2
of ∼46% and -8.5% for H→2H→4H). Additionally, the NO conversion decreased from ∼29% to ∼7% and the selectivity decreased from ∼85% to ∼80% (passing through a point of minimum at 2H) when the height was varied in the range H-4H. When comparing the results from the CFD simulations and the predictions of a plug flow model, deviations for NO conversion and selectivity increased with H (Δ
max of ∼2% and ∼45%, respectively).
KW - CFD
KW - NOx
KW - Photocatalysis
KW - Validation
KW - Reactor analysis
UR - http://www.scopus.com/inward/record.url?scp=85050657453&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2018.07.009
DO - 10.1016/j.jhazmat.2018.07.009
M3 - Article
C2 - 30075969
VL - 372
SP - 145
EP - 153
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -