Abstract
The effect of acid treatment on TS-1 zeolite prior to alkaline treatment with TPAOH solution is investigated. 1H MAS NMR, UV–Vis, XPS, XRF, N2-sorption and TEM are applied to characterize the acid and/or alkaline treated TS-1 samples. It is found that acid treatment destructs the Si–O-Ti bonds of the framework, and promotes the conversion of 4-coordinated Ti into 6-coordinated Ti. Then in the subsequent alkaline treatment, part of framework Si–O-Si bonds are hydrolyzed and mesopores are formed. Meanwhile, the dissolved Si and Ti species could be incorporated back into the framework directed by TPAOH. Compared with TS-1-A, which is synthesized without acid treatment, TS-1-HA remains more active center and enhanced accessibility. Therefore, it shows high catalytic performance in cyclohexanone ammoximation reaction.
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Gao, Z., Zhao, Y., Yang, L. et al. Unraveling the Effect of Acid Treatment Prior to Alkaline Treatment on the Performance of TS-1 Zeolite. Catal Lett (2024). https://doi.org/10.1007/s10562-024-04680-4
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DOI: https://doi.org/10.1007/s10562-024-04680-4