Photocatalytic conversion of NO using TiO?-NH?catalysts in ambient air environment

Abstract

Photocatalytic conversion of nitric oxide (NO) in ambient air was studied in a continuous-flow photoreactor system at room temperature using different TiO?catalysts prepared with different titanium precursors of Ti(SO?)?, TiOSO?, and Ti(O-Bu)?by either a moderate-temperature hydrothermal process or a hydrothermal reflux process. The physicochemical properties of the prepared catalysts were characterized by XRD, BET, FTIR, and SEM. Analytical results showed that the crystallinity, morphology, nitrogen adsorption¡Vdesorption isotherms, specific surface area, and pore size distribution of catalysts were significantly affected by the precursors and hydrothermal processes, but the crystal structure and crystal size of catalysts were not significantly influenced. The NO conversion experiments demonstrated that the TiO?catalysts prepared by the moderate-temperature hydrothermal process without ammonia pretreatment could