Abstract
Dense and good catalytic performance TS-1 zeolite membranes were rapidly prepared on porous mullite support by secondary hydrothermal synthesis. The properties of seed crystals were very important for the preparation of high-catalytic performance TS-1 zeolite membranes. Influences of seed crystals (Ti/Si ratios, size, morphology, and zeolites concentration of the seed suspension) on the growth and catalytic property of TS-1 zeolite membranes were investigated in details. High Ti/Si ratio, medium-size, and morphology of the seed crystals were critical for preparing the high-performance TS-1 zeolite membrane. Compared with the bi-layer TS-1 zeolite membrane (inner and outer of the mullite tube), the mono-layer TS-1 zeolite membrane had a better catalytic performance for Isopropanol IPA oxidation with H2O2. When the Ti/Si ratio, size, and morphology of the TS-1 zeolites were 0.030, 300 nm, ellipsoid, and the zeolites concentration of the seed suspension was 5%, the IPA conversion, and flux through the TS-1 zeolite membrane were 98.23% and 2.58 kg·m−2·h−1, respectively.
Highlights
Taramasso et al prepared the titanium silicalite-1 (TS-1) with MFI structure by the hydrothermal synthesis in 1983, which was a breakthrough in the zeolites field [1]
TS-1 zeolite membrane could avoid the separation and recovery processes [8,9,10], which is a novel and good catalyst for H2 O2 oxidations with some advantages, such as mild conditions, environment-friendly, and energy-saving [11,12]
Compact and good catalytic performance TS-1 membranes have been successfully prepared by in-situ or secondary growth hydrothermal synthesis [13,14,15]
Summary
Taramasso et al prepared the titanium silicalite-1 (TS-1) with MFI structure by the hydrothermal synthesis in 1983, which was a breakthrough in the zeolites field [1]. Compact and good catalytic performance TS-1 membranes have been successfully prepared by in-situ or secondary growth hydrothermal synthesis [13,14,15]. A layer of seeded zeolites is coated on suitable support before crystallization, which is an effective way for shortening the crystallization time and preparing high-quality zeolite membranes [16,17,18,19,20]. Zhu et al first prepared the Ti-MWW zeolite membrane by secondary hydrothermal synthesis, and the membranes showed good catalytic performance for phenol hydroxylation [17]. The high catalytic performance TS-1 zeolite membrane with the ultra-dilute synthetic solution by the secondary hydrothermal synthesis in our previous study, which greatly shortened the crystallization time and preparation cost of the membrane [20]. Influences of the bi-layer/mono-layer TS-1 zeolite layer on the catalytic performance of the TS-1 zeolite membrane were investigated in this work
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