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reactor, a NO gas supply, a humidifier, a UV lamp (Ultra-Vitalux 300 W (OSRAM, München, Germany) UVA (315–400 nm) and UVB (280–315 nm)), a test gas generator model Sycos KT-GPTM (Ansyco, Karlsruhe, Germany) and a chemiluminescence NOx analyzer AC 32 M (environment S.A, Poissy, France), as shown in Figure 7. Figure 7. Schematic flow diagram of photocatalytic setup. (1) Humidifier; (2) NO gas supply; (3) test gas generator; (4) reactor; (5) UV lamp; (6) By pass; (7) NOx analyzer; (8) Data recorder. The reactor is made from non-adsorbing polymethyl methacrylate (PMMA) with 0.48 m length, 0.10 m width, and 0.06 m height. It is covered with a quartz glass plate permitting access of UV light to the reactor. The catalyst is filled as a powder into a sample holder made of plastic (PMMA) of the following dimensions (0.1 m length, 0.05 m width and 0.01 m height) and then placed in the middle of the reactor. The UV lamp is located above the reactor at a distance between the lamp and the reactor of 76 cm to achieve the UV irradiance of 10 W ̈ m ́2 recommended by the ISO standard [37]. The amount of NO, NO2 and NOx were continuously (5 s sampling frequency) monitored at the gas outlet using the chemiluminescence NOx analyzer. The photocatalytic NO oxidation experiments were carried out at ambient temperature and pressure. In a typical experiment, 5 g of the sample was placed in the sample holder covering an area of 0.005 m2. Then, a stream of NO (1000 ppb) in air at 50% relative humidity with a total volumetric flow rate of 3 dm3 ̈ min ́1; was led through the system using a bypass. Typically, after 15 min, the desired NO and water concentrations reached a steady state at the desired values. Subsequently, the humid NO-containing feed was supplied to the reactor with the UV light turned off. After achieving adsorption equilibrium as indicated by a constant NO concentration in the gas leaving the reactor, typically after 5 min, the UV light was switched on. After 24 h on-stream, the UV light was turned off again and the outlet concentration of NO was monitored under flow of the reactant feed through the reactor until it reached the initial concentration of 1000 ppb, typically after 15 min. It was proven 170PDF Image | Zeolite Catalysis
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