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Catalysts 2016, 6(2), 31; doi:10.3390/catal6020031

Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5

Institute of Chemical Technology, Universität Leipzig, Linnéstraβe 3, 04103 Leipzig, Germany
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Academic Editor: Andreas Martin
Received: 16 November 2015 / Revised: 14 February 2016 / Accepted: 14 February 2016 / Published: 19 February 2016
(This article belongs to the Special Issue Zeolite Catalysis)
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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. View Full-Text
Keywords: TiO2; PCO; photocatalytic activity; NOx; XRD; SEM; preparation techniques TiO2; PCO; photocatalytic activity; NOx; XRD; SEM; preparation techniques
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tawari, A.; Einicke, W.-D.; Gläser, R. Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5. Catalysts 2016, 6, 31.

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