Abstract
Hierarchical and hydrophobic TS-1 was obtained by the desilication and silanization of TS-1. The modified TS-1 was characterized by adsorption–desorption isotherms analysis, transmission electron microscope, scanning electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy and contact angle measurement. It demonstrates that modified TS-1 has hierarchical channel structures consisting of micropores and mesopores. The average pore diameters of the micropores and mesopores are 0.55 and 5–10 nm, respectively. The contact angle measurements indicate that modified TS-1 is hydrophobic. The effects of the desilication and silanization of TS-1 on the catalyst structure and catalytic properties of propylene epoxidation were investigated. Modified TS-1 showed better catalytic activity and catalytic life than the TS-1 without modification. The H2O2 conversion, PO selectivity and PO concentration reached 99.72%, 91.33% and 0.85 mol L−1, respectively.
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Abbreviations
- RC:
-
Relative crystallinity
- PO:
-
Propene oxide
- HPPO:
-
Hydrogen peroxide-to-propene oxide
- MME:
-
Propylene glycol monomethyl ether
- PG:
-
Propylene glycol
- XRD:
-
X-ray diffraction
- FT-IR:
-
Fourier transform infrared spectroscopy
- TEM:
-
Transmission electron microscope
- SEM:
-
Scanning electron microscope
- TMCS:
-
Trimethylchlorosilane
- TCD:
-
Thermal conductivity detector
- TEOS:
-
Tetraethyl orthosilicate
- TBOT:
-
Tetra-butyl ortho-titanate
- TPAOH:
-
Tetrapropylammonium hydroxide
- ICP-OES:
-
Inductively coupled plasma optical emission spectrometry
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The authors are grateful of financial support by National Natural Science Foundation of China (21606168).
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Wang, B., Lu, L., Ge, B. et al. Hydrophobic and hierarchical modification of TS-1 and application for propylene epoxidation. J Porous Mater 26, 227–237 (2019). https://doi.org/10.1007/s10934-018-0647-7
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DOI: https://doi.org/10.1007/s10934-018-0647-7