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Figure 6. XRD patterns of (a) TiO2 and (b) composite TZSG (50/50) from sol-gel synthesis after calcination at different temperatures. The highest photocatalytic activity with respect to NO conversion is achieved for the composite calcined at 523 K (Table 4). At the lower calcination temperature of 423 K, the NO conversion is lower and more NO2 is formed similar to the pure TiO2 catalysts (cf. Table 1). It cannot be ruled out, however, that this is due to incomplete crystallization of the TiO2 at this low calcination temperature. When the composite is calcined at 623 K or higher, the photocatalytic activity decreases with the calcination temperature as evident from the lower NO conversion and the lower amount of NO removed, however at lower selectivity for NO2 than for the material calcined at 423 K. Table 4. Conversion of NO (XNO) and of NOx (XNOx ), selectivity for NO2 (SNO2 ), amount of NO removed (ZNOq, amount of NO2 formed pZNO2 q, and net amount NOx removedpZNOx q in the photocatalytic oxidation of NO over different TiO2 and TiO2/ZSM-5 composite catalysts after 24 h UV irradiation (5 g TiO2 or composite, 1000 ppb NO, 50% relative humidity, 3 dm3 ̈min ́1 total volumetric flow rate, 10 W ̈ m ́2 UV irradiance, 0.005 m2 irradiated area). T /K X {% X {% calcinaton NO NOx 423 30 19 523 41 33 623 38 30 723 35 28 823 27 21 ZNO{ ZNO2{ ZNOx{ S {% μmol ̈ m ́2 ̈ h ́1 μmol ̈ m ́2 ̈ h ́1 μmol ̈ m ́2 ̈ h ́1 NO2 494 287 280 48 655 131 524 19 608 119 447 19 548 109 400 20 429 150 292 25 This can be well explained by a lower surface area of the larger TiO2 crystals and is also consistent with a less intense interaction of the larger TiO2 particles with the outer surface of the zeolite crystals. For the material calcined at 823 K, the presence of 167PDF Image | Zeolite Catalysis
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