Abstract
Compact and tubular TS-2 zeolite membrane is successfully fabricated on the mullite support by secondary hydrothermal synthesis. The mullite supports are fully covered by the aggregated walnut-shaped TS-2 zeolite crystals, which are the aggregates of fine and rod-shaped crystals and have high BET surface area, total pore capacity and mesoporous volume by advance isothermal characterization. The incorporation of the Ti atoms in framework positions of the MEL zeolite lattice and mainly form tetrahedrally coordinated titanium. Besides, influence of the crystallization temperature and time on the growth and catalytic performance are investigated in this work. The as-synthesized TS-2 zeolite membrane has a good catalytic performance for phenol hydroxylation by hydrogen peroxide. When the reaction temperature and molar ratio of phenol/hydrogen peroxide are 50 °C and 2, the flux, phenol conversion and dihydroxybenzene selectivity of TS-2 zeoite membrane are 6.43 kg m −2 h −1 , 32.23% and 99.88%, respectively. • Compact and tubular TS-2 zeolite membrane is successfully prepared. • Aggregated walnut-shaped TS-2 zeolites have high BET surface area, total pore capacity and mesoporous volume. • TS-2 zeolite membrane has a good catalytic performance for phenol hydroxylation by hydrogen peroxide. • Flux, phenol conversion and dihydroxybenzene selectivity of TS-2 zeoite membrane are 6.43 kg m −2 h −1 , 32.23% and 99.88%.
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