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Figure 3. Arrhenius plots obtained for (blue squares) TS-1 and (hollow red squares) TS-1B. Figure 4. Comparison of selectivity as a function of conversion for (blue) TS-1 and Figure 4. Comparison of selectivity as a function of conversion for (blue) TS-1 and (red) (red) TS-1B. Reaction conditions: [allyl alcohol] = 0.5 M, [H2O2] = 0.25 M, mass of TS-1B. Reaction conditions: [allyl alcohol] = 0.5 M, [H2O2] = 0.25 M, mass of catalyst = 50 mg, catalyst = 50 mg, various temperatures. Conversion is calculated according to the initial concentration of H O , as a 2:1 olefin:H O ratio was employed. various temperatures. Conversio2n2is calculated a2cc2ording to the initial concentration of H2O2, as a 2:1 olefin:H2O2 ratio was employed. 2.3. Catalytic Studies of H2O2 Decomposition To further understand the impact of NH4HF2 treatment, we also investigated the ability of TS-1 and TS-1B to catalyse H2O2 decomposition. As described above, unwanted H2O2 decomposition is clearly disadvantageous, leading to an unwanted loss of expensive oxidant, and potentially increasing safety issues associated. To evaluate the catalytic decomposition of H2O2, we performed the epoxidation reaction without the olefin being present, i.e., solvent, catalyst and H2O2 concentrations were maintained, but the olefin substrate was absent. The loss of H2O2 with time could then be compared to control experiments in the absence of catalyst over the same time period, so as to rule out purely thermal losses (we note here that no thermal losses were observed at temperatures at or below 70 ◦C). Both TS-1 and TS-1B are unsurprisingly less reactive for H2O2 decomposition than for epoxidation, and longer reaction times are required to induce substantial decomposition. Under reaction conditions identical to the epoxidation reaction, i.e., at 50 ◦C, neither catalyst decomposes more than 6% of the initial H2O2 present in the first 90 min, even in the absence of the olefin. Despite this, clear differences between the decomposition activities of each catalyst can be observed following 105PDF Image | Zeolite Catalysis
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