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Table 1. 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 removed pZNOx 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). Catalysts X P25 TiO2 Hombikat TSSSG HZMM (25/75) HZMM (50/50) HZMM (75/25) HZSSD (25/75) HZSSD (50/50) HZSSD (75/25) TZSG (25/75) TZSG (50/50) TZSG (75/25) NO 45 32 35 31 16 21 24 28 30 29 31 41 36 {% X NOx 16 19 16 12 9 14 16 17 22 19 23 33 27 {% ZNO{ μmol ̈ m ́2 ̈ h ́1 704 601 518 502 257 327 373 435 553 450 483 655 572 ZNO2{ μmol ̈ m ́2 ̈ h ́1 455 291 271 305 108 103 132 163 169 160 123 131 166 ZNOx{ μmol ̈ m ́2 ̈ h ́1 249 310 247 197 149 224 241 271 384 290 360 524 406 SNO2 { % 65 48 52 62 33 31 38 37 30 35 25 19 29 Table 2. Content of NO3 ́ present in the catalysts after the photocatalytic experiment. Samples Hombikat P25 TSSSG TZSG (50/50) NO3 ́ /mg ̈g ́1 0.30 0.26 0.22 0.66 If zeolite ZSM-5 is present in the photocatalysts, a different behavior is observed. Generally, the selectivity for NO2 over the composites is lower than for the pure TiO2-based analogues, although the NO conversion is lower. During the photocatalytic NO oxidation over the composites, the NO2 concentration is much lower, and it decreases less strongly than in the case of the zeolite-free TiO2 materials (Figure 5d,e). This indicates that NO2 was effectively adsorbed by the zeolite ZSM-5 and is further oxidized to NO3 ́ after diffusion to and conversion over the photocatalytically active TiO2 particles. 163PDF Image | Zeolite Catalysis
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