Chinese Journal of Catalysis ›› 2024, Vol. 64: 133-142.DOI: 10.1016/S1872-2067(24)60097-5
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Chang Wanga, Tingting Yanb,*(), Weili Daia,*(
)
Received:
2024-05-30
Accepted:
2024-07-09
Online:
2024-09-18
Published:
2024-09-19
Contact:
* E-mail: Supported by:
Chang Wang, Tingting Yan, Weili Dai. Deactivation mechanism of acetone to isobutene conversion over Y/Beta catalyst[J]. Chinese Journal of Catalysis, 2024, 64: 133-142.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60097-5
Fig. 1. Acetone conversion (a) and product selectivity (b) in the acetone to isobutene conversion over Y/Beta, [Si]Beta and Y2O3 catalysts. Reaction conditions: 573-773 K, WHSV = 1.0/h.
Fig. 2. Catalytic performance of fresh and regenerated Y/Beta zeolite in the acetone to isobutene conversion at 623 (a) and 723 K (b) with a TOS of 15 h.
Fig. 3. TPSR profiles recorded during the acetone (a), diacetone alcohol (b) and mesityl oxide (c) conversion. Reaction conditions: 303-773 K, WHSV = 1.0/h.
Fig. 4. (a) TP-UV-vis spectra recorded during the acetone conversion in the temperature range of 303-773 K over Y/Beta catalysts. In situ UV-vis spectra recorded during the acetone to isobutene conversion at 423 (b) and 623 K (c) with a TOS of 30 min over Y/Beta catalyst. Reaction conditions: WHSV = 1/h. (d) Possible assignments of UV-vis bands correspond to the acetone to isobutene conversion over Y/Beta catalyst.
Fig. 5. 13C CP MAS NMR spectra of [Si]Beta (a) and Y/Beta (b) recorded after adsorption of acetone-2-13C at different reaction temperature with a TOS of 5 min. 13C CPMAS NMR spectra of Y/Beta recorded after adsorption of acetone-2-13C for TOS of 30 min at 423 (c) and 623 K (d).
Fig. 6. GC-MS chromatograms of organic extracts from Y/Beta catalysts obtained after the conversion of acetone to isobutene with different TOS at 423 (a) and 623 K (b). (c) Structures of the organic compounds occluded in the spent Y/Beta catalysts after the conversion of acetone to isobutene.
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