Journal
ACS CATALYSIS
Volume 6, Issue 12, Pages 8420-8431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02032
Keywords
germanosilicate; stannosilicate; extra-large pore; structural rearrangement; selective oxidation
Categories
Funding
- NSFC of China [21533002, 21373089, 21573074, 21571128, 21603075]
- China Ministry of Science and Technology [2016YFA0202804]
- National Excellent Doctoral Dissertation of PR China [201454]
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The crystalline structure of UTL zeolite experienced an unusual orientated collapse and reconstruction within an extremely narrow time window during the structural stabilization process by nitric acid treatment at elevated temperature. Taking full advantage of this unique structural change, extra-large pore Sn-UTL zeolites were postsynthesized via the reaction between the SnCl4 molecules and the silanols in the hydroxyl nests, which occurred concomitantly with the removal of Ge and/or Si species from the dense layer. The original UTL topology was restored thereafter, leading to a Sn-incorporated analogue. The usage of the most seriously collapsed intermediate structure, which was captured by timing during the precisely controlled acid treatment, was vital for achieving Sn-UTL zeolites with a larger amount of isolated Sn species effectively incorporated. With tetrahedrally coordinated Sn ions in the highly stabilized UTL topology consisting of intersecting 12- and 14-membered ring (MR) pore channels, Sn-UTL showed promising catalytic performance in the Meerwein-Pondorf-Verley reaction as well as in the Baeyer-Villiger oxidation reactions of ketones using H2O2 or even bulky tert-butyl hydroperoxide (TBHP) as an oxidant.
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