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Figure 4. Phenyl benzoate (PB) reactivity: selectivity to main products based on PB conversion. Temperature: 190 °C. Scheme 1. Reaction scheme for phenol benzoylation with BA over H-beta zeolites. Scheme 1. Reaction scheme for phenol benzoylation with BA over H-beta zeolites. 2.4. The Reactivity of H-Y Zeolites .4. The Reactivity of H-Y Zeolites We tested the reactivity of three different commercial H-Y zeolites (Table 2). In regard to the acidity of H-Y, it is reported in the literature that Lewis acidity We tested the reactivity of three different commercial H-Y zeolites (Table 2). In regard to the acidi may also play an important role, even for samples having low Al content (see, for f H-Y, it is reported in the literature that Lewis acidity may also play an important role, even for sampl instance [103], and the references therein). aving low Al content (see, for instance [103], and the references therein). The results of catalytic experiments are shown in Figure 5. As can be seen, in all cases, phenol conversion was lower than that obtained with H-beta zeolites. If the The results of catalytic experiments are shown in Figure 5. As can be seen, in all cases, phen initial conversion is taken into account, e.g., at a 0.25 h reaction time, the scale of onversion was lower than that obtained with H-beta zeolites. If the initial conversion is taken in activity was HY-7 > HY-3 > HY-100; thus, in this case also, as with H-beta zeolites, ccount, e.g., at a 0.25 h reaction time, the scale of activity was HY-7 > HY-3 > HY-100; thus, in th the greatest activity was obtained with the intermediate SAR ratio. Overall, however, the activity was not much affected by the Si/Al ratio. With these catalysts, also, PB was the only primary product, and the formation of HBPs occurred by the consecutive transformation of the ester. However, the selectivity to HBPs was lower than that shown with H-beta zeolites, even with the more active H-Y sample. Therefore, H-Y zeolites were also poorly efficient in the consecutive transformation of PB into HBPs; this is particularly apparent with the sample HY-100, which showed a negligible consecutive transformation of PB into HBP, even at 30% phenol conversion. With all of the H-Y zeolites tested, no BPB formation was shown. The lowest p-/o-HBP selectivity ratio was achieved with HY-100, the highest with H-Y samples having the greater Al content, which is the opposite of what was observed with H-beta zeolites; however, in this case also, the selectivity ratio seemed to approach a value close to one when the phenol conversion was increased. 127 t e o tPDF Image | Zeolite Catalysis
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