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Hybrid Organic−Inorganic Solids That Show Shape Selectivity

Román-Leshkov, Yuriy and Moliner, Manuel and Davis, Mark E. (2010) Hybrid Organic−Inorganic Solids That Show Shape Selectivity. Chemistry of Materials, 22 (8). pp. 2646-2652. ISSN 0897-4756. http://resolver.caltech.edu/CaltechAUTHORS:20100513-094810982

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Abstract

Hybrid organic−inorganic solids featuring millimolar/gram concentrations of intracrystalline organic moieties and shape-selectivity are synthesized. Pure-silica zeolite beta crystals are coated with zirconia and treated in aqueous sodium hydroxide to create defects and mesoporosity within the crystalline structure. Aminopropyl organic groups are subsequently grafted onto the generated intracrystalline silanol groups. After grafting, characterization data indicate a high organic concentration localized primarily within the intracrystalline voids. Specifically, thermogravimetric analysis shows an organic loading of 0.7 mmol of NH_2/g, ^(29)Si solid-state nuclear magnetic resonance (NMR) spectra display a quantitative decrease in Q^3 silicon atoms with a corresponding resharpening of the Q^4 resonances, and N_2 adsorption data show a decrease in micropore volume to 0.10 cm^3/g. Knoevenagel condensation reactions are catalyzed by the aminopropyl-functionalized materials using differently sized aldehydes and the results show that the zirconia-protected functionalized solid have shape selective properties.


Item Type:Article
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http://dx.doi.org/10.1021/cm100108e DOIUNSPECIFIED
Additional Information:© 2010 American Chemical Society. Publication Date (Web): March 3, 2010. Received January 12, 2010. Revised Manuscript Received February 17, 2010. Financial support for the work was provided by British Petroleum. M.M acknowledges the Fundacion Ramon Areces Postdoctoral Research Fellowship Program for financial support.
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British Petroleum UNSPECIFIED
Fundacion Ramon Areces Postdoctoral Research Fellowship Program UNSPECIFIED
Record Number:CaltechAUTHORS:20100513-094810982
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100513-094810982
Official Citation:Hybrid Organic−Inorganic Solids That Show Shape Selectivity Yuriy Romn-Leshkov, Manuel Moliner, Mark E. Davis Chemistry of Materials 2010 22 (8), 2646-2652
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18285
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 May 2010 20:45
Last Modified:28 Mar 2014 05:05

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