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One-step process for demethoxylation and dealkylation over (a–d) stacked-bed and (e,f) mixed-bed Au/TiO2 and HZSM-5 (Si/Al = 15) catalysts in benzene using a fixed-bed down-flow reactor (conditions: 5 mol % 4-propylguaiacol in benzene, 350 °C, 100 bar, gas flow rate 30 N mL/min H2, weight hourly space velocity (WHSV): (a) 48 h–1, (b and e) 40 h–1, (c and f) 30 h–1, and (d) 20 h–1.
