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Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5 Akram Tawari, Wolf-Dietrich Einicke and Roger Gläser Abstract: Composites of TiO2 (Hombikat, P25, sol-gel synthesis) and zeolite ZSM-5 (nSi/nAl = 55) with mass fractions from 25/75 to 75/25 were prepared by mechanical mixing, solid-state dispersion and sol-gel synthesis. Characterization of the composites by X-ray diffraction (XRD), N2-sorption, scanning electron microscopy (SEM), and UV-Vis spectroscopy show that mechanical mixing and solid-state dispersion lead to comparable textural properties of the composites. A homogeneous distribution and intimate contact of small TiO2 particles on the crystal surface of zeolite ZSM-5 were achieved by sol-gel synthesis. The composites were studied in the photocatalytic oxidation (PCO) of NO in a flatbed reactor under continuous flow according to ISO 22197-1. The highest NO conversion of 41% at an NO2 selectivity as low as 19% stable for 24 h on-stream was reached over the TiO2/ZSM-5 composite from sol-gel synthesis with equal amounts of the two components after calcination at 523 K. The higher activity and stability for complete NO oxidation than for pure TiO2 from sol-gel synthesis, Hombikat, or P25 is attributed to the adsorptive properties of the zeolite ZSM-5 in the composite catalyst. Increasing the calcination temperature up to 823 K leads to larger TiO2 particles and a lower photocatalytic activity. 1. Introduction The increasing consumption of fossil fuels and the worldwide industrial growth has resulted in increasing emissions and air pollution. Nitrogen oxides NOx are among the major pollutants that strongly contribute to the air emissions [1,2]. NOx emissions mainly consist of nitric oxide NO and nitrogen dioxide NO2 [3]. In particular, NO2 can cause severe impacts on the environment and on human health, e.g., by the formation of acid rain and photochemical smog or by damaging the lung tissue of human beings [1,2]. To reduce NOx emissions from the atmosphere, several technologies are applied including selective catalytic reduction (SCR) [4,5]. Most of these technologies, however, are cost-intensive and require elevated operating temperatures and continuous maintenance. Hence, alternative approaches are Reprinted from Catalysts. Cite as: Tawari, A.; Einicke, W.-D.; Gläser, R. Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5. Catalysts 2016, 6, 31. 154PDF Image | Zeolite Catalysis
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