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2.3. Reactivity Experiments with PB Figure 4 plots the selectivity to products obtained by reacting PB over the HB-38 zeolite, based on phenol conversion. Unexpectedly, HBPs appeared to not be primary products of PB transformation, because their selectivity extrapolated at nil conversion was close to zero. This implies that the contribution of the intramolecular Fries rearrangement is negligible and that during phenol benzoylation, the formation of HBPs only occurs by means of the bimolecular reaction between PB and phenol. In the case of the reaction starting from PB, the intermolecular reaction may only occur between two PB molecules, to produce mainly p-BPB (selectivity to the ortho isomer was very low) and phenol. A further consecutive reaction between phenol and BPB or phenol and PB leads to the production of HBP isomers, with the coproduction of PB or phenol, respectively (however, in the latter case, the decrease in phenol atalysts 2015, 5 223 selectivity shown in Figure 4 would not be justified). A rather similar trend was observed during PB reaction with HB-150. The overall reaction network, as inferred from the experiments carried out The overall reaction network, as inferred from the experiments carried out starting from phen starting from phenol and from PB, is shown in Scheme 1. Results suggest that d from PB, is shown in Scheme 1. Results suggest that differences shown among the H-beta sampl differences shown among the H-beta samples are not due to the presence of various e not due to the presence of various mechanisms for the transformation of phenyl benzoate into HBP mechanisms for the transformation of phenyl benzoate into HBPs, but are instead ut are insteadatatrtitbriubtuabtaleblteo thoethaceidaictiydfietyatufereastuorfetshoe fHt-hbetHa -zbeeotlaitezsetoelsitteds. tested. Figure 4. Phenyl benzoate (PB) reactivity: selectivity to main products based on PB Figure 4. Phenyl benzoate (PB) reactivity: selectivity to main products based on PB conversion. Temperature: 190 ◦C. conversion. Temperature: 190 °C. 126 C o ne rsPDF Image | Zeolite Catalysis
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