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SSZ-70 borosilicate delamination without sonication: effect of framework topology on olefin epoxidation catalysis

Okrut, Alexander and Aigner, Martina and Schöttle, Christian and Grosso-Giordano, Nicolás A. and Hwang, Son-Jong and Ouyang, Xiaoying and Zones, Stacey and Katz, Alexander (2018) SSZ-70 borosilicate delamination without sonication: effect of framework topology on olefin epoxidation catalysis. Dalton Transactions, 47 (42). pp. 15082-15090. ISSN 1477-9226.

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We report a scalable delamination procedure for a SSZ-70-framework layered-zeolite precursor, which for the first time does not involve either sonication or long-chain surfactants. Our approach instead relies on the mild heating of layered zeolite precursor B-SSZ-70(P) in an aqueous solution containing Zn(NO_3)_2 and tetrabutylammonium fluoride. Powder X-ray diffraction data are consistent with a loss of long-range order along the z-direction, while ^(29)Si MAS NMR spectroscopy demonstrates preservation of the zeolite framework crystallinity during delamination. The resulting delaminated material, DZ-2, possesses 1.4-fold higher external surface area relative to the nondelaminated three-dimensional zeolite B-SSZ-70, based on N2 physisorption data at 77 K. DZ-2 was functionalized with cationic Ti heteroatoms to synthesize Ti-DZ-2 via exchange with framework B. Ti-DZ-2 contains isolated titanium centers in its crystalline framework, as shown by UV-Vis spectroscopy. The generality of the synthetic delamination approach and catalyst synthesis is demonstrated with the synthesis of delaminated material DZ-3, which is derived from layered zeolite precursor ERB-1(P) with MWW framework topology. Upon catalytic testing for the epoxidation of 1-octene with ethylbenzene hydroperoxide as oxidant, under harsh tail-end conditions that deactivate amorphous Ti-silica-based catalysts, Ti-DZ-2 exhibits the highest per-Ti-site activity, selectivity, and stability for 1-octene epoxidation of all catalysts investigated. This testing includes the prior benchmark delaminated zeolite catalyst in this area, Ti-UCB-4, which possesses similar external surface area to Ti-DZ-2 but requires sonication and long-chain surfactants for its synthesis. The synthesis of DZ-2 is the first example of an economical delamination of layered zeolite precursor SSZ-70(P) and opens up new doors to the development of delaminated zeolites as commercial catalysts.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Okrut, Alexander0000-0002-0689-4346
Aigner, Martina0000-0002-1829-3142
Schöttle, Christian0000-0001-9537-1573
Grosso-Giordano, Nicolás A.0000-0002-0912-366X
Hwang, Son-Jong0000-0002-3210-466X
Katz, Alexander0000-0003-3487-7049
Additional Information:© 2018 The Royal Society of Chemistry. The article was received on 25 Jul 2018, accepted on 03 Oct 2018 and first published on 03 Oct 2018. The authors are grateful to the National Science Foundation (PFI: AIR-TT 1542974), which provided funding for enabling reported materials synthesis activities, and the Office of Basic Energy Sciences of U.S. Department of Energy (DE-FG02-05ER15696), which provided funding for undertaking all reported catalysis experiments. The authors are also grateful for the Management and Transfer of Hydrogen via Catalysis Program funded by Chevron Corporation, which provided funding for a postdoctoral fellowship to X. O. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. C. S. acknowledges Deutsche Forschungsgemeinschaft (DFG) for a research fellowship. Conflicts of interest: The authors declare the following competing financial interests: (1) The funding for the research partially came from Chevron Energy Technology Co. and (2) X. O. and S. I. Z. are employees and stockholders in Chevron Corp. (3) A.K. and A.O. have ownership in Berkeley Materials Solutions, a company that is commercializing zeolitic materials for applications in catalysis, including olefin epoxidation.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER15696
Chevron CorporationUNSPECIFIED
Department of Energy (DOE)DE-AC02-05CH11231
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Issue or Number:42
Record Number:CaltechAUTHORS:20181012-101821745
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90263
Deposited By: Tony Diaz
Deposited On:12 Oct 2018 20:22
Last Modified:03 Oct 2019 20:23

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