NOx abatement from stationary emission sources by photo-assisted SCR: Lab-scale to pilot-scale studies
Journal
Applied Catalysis A: General
Journal Volume
523
Pages
294-303
Date Issued
2016
Author(s)
Abstract
In developing a higher activity for NOx abatement from stationary emission sources, photo-assisted selective catalytic reduction (photo-SCR) was systematically investigated over TiO2 supported on a spherical £\-Al2O3/£^-Al2O3. The formation of NO2 was virtually suppressed in the reaction temperature range of 110¡V200?¢XC. The NOx removal efficiencies of TiO2/£^-Al2O3 photocatalyst at 120?¢XC for real flue gas (in pilot-scale photoreactor) and simulated flue gas (in lab-scale photoreactor) were 68¡V75% and 43.5%, respectively, in the presence of reducing reagent (C4H10). SEM and XPS techniques revealed that sulfur temporarily occupied the active sites of the photocatalyst, causing deactivation. Spent TiO2/£^-Al2O3 photocatalyst was regenerated via desulfurization by either air or hydrogen at 400¡V500?¢XC. The effects of regeneration temperature and regeneration time on the photocatalytic activity are methodically investigated, demonstrating that using hydrogen at 500?¢XC in 1?h could completely regenerate the spent photocatalyst. ? 2016 Elsevier B.V.
Subjects
Desulfurization
Lab-scale
NOx abatement
Photo-assisted SCR
Photocatalyst
Pilot-scale
Type
journal article