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Improved Ti species distribution and hierarchical pores in TS-1: Towards regeneration of deactivated TS-1 caused by the corrosion of alkali

Abstract

An effective strategy to regenerate deactivated titanium silicalite-1 zeolite (TS-1) from industrial cyclohexanone ammoximation process has been explored by using tetrapropylammonium bromide (TPABr) and ethanolamine solution under hydrothermal condition. For deactivated TS-1, the yield of cyclohexanone oxime was only 19.2% in cyclohexanone ammoximation reaction. After the second regeneration, the regenerated TS-1 showed higher catalytic performance than fresh TS-1 and the yield of cyclohexanone oxime was up to 99.4%. Characterization results showed that the relative crystallinity, micropore surface, micropore volume, and surface framework Ti species significantly restored and huge hierarchical pores were introduced after regeneration. Moreover, the regenerated TS-1 exhibited excellent performance than fresh TS-1 in resisting the corrosion of alkali. The exploration of effective regeneration strategy for deactivated TS-1 can bring about the benefits of economic and environment in commercial ammoximation process, and provide new perspectives for developing more robust TS-1.

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Supplementary files

Article information


Submitted
24 Feb 2020
Accepted
19 Mar 2020
First published
20 Mar 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Improved Ti species distribution and hierarchical pores in TS-1: Towards regeneration of deactivated TS-1 caused by the corrosion of alkali

M. Zhang, Y. Wen, L. zong, H. Wei and X. Wang, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ00960A

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