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Catalytic Activity of Titanium Silicates Synthesized in the Presence of Alkali-Metal and Alkaline-Earth Ions

Khouw, Charles B. and Davis, Mark E. (1995) Catalytic Activity of Titanium Silicates Synthesized in the Presence of Alkali-Metal and Alkaline-Earth Ions. Journal of Catalysis, 151 (1). pp. 77-86. ISSN 0021-9517. doi:10.1006/jcat.1995.1010. https://resolver.caltech.edu/CaltechAUTHORS:20170710-100105789

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Abstract

Titanium containing aluminum-free ZSM-5 (TS-1) synthesized in the presence and absence of alkali metal and alkaline earth ions are investigated as catalysts for the selective oxidation of alkanes and alkenes using aqueous H_2O_2 as oxidant at temperatures below 100°C. Sodium-exchanged TS-1 is not active for alkane oxidations. Similarly, no catalytic activity is observed for TS-1 synthesized in the presence of high concentrations of alkali metal ions (Si/Na <20). For both cases, the catalytic activity can be restored by washing the solid with acid solution prior to catalytic evaluation. Similar results are obtained for TS-1 synthesized in the presence of other alkali metal ions, e.g., Li, K. However, the presence of alkaline earth ions, e.g., Mg, in the synthesis gel does not have a significant effect on the catalytic activity of TS-1. Based on the catalytic data and the physicochemical properties of the samples, a plausible explanation for the above results is described. The acid treatment may be useful in overcoming the problems of synthesizing TS-1 from reagents that contain alkali metal ions, e.g., TPAOH solutions. More importantly, this treatment opens the possibility of synthesizing other titanium-containing silicate structures that require the presence of alkali metal ions in the synthesis gel for their formation.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1006/jcat.1995.1010DOIArticle
http://www.sciencedirect.com/science/article/pii/S002195178571010XPublisherArticle
ORCID:
AuthorORCID
Davis, Mark E.0000-0001-8294-1477
Additional Information:© 1995 Academic Press. Received April 4, 1994; revised September 2, 1994. Support of this work was provided by the Shell Development Co. and the NSF Alan T. Waterman Award to M. E. D.
Funders:
Funding AgencyGrant Number
Shell Development CompanyUNSPECIFIED
NSFUNSPECIFIED
Issue or Number:1
DOI:10.1006/jcat.1995.1010
Record Number:CaltechAUTHORS:20170710-100105789
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170710-100105789
Official Citation:C.B. Khouw, M.E. Davis, Catalytic Activity of Titanium Silicates Synthesized in the Presence of Alkali-Metal and Alkaline-Earth Ions, Journal of Catalysis, Volume 151, Issue 1, January 1995, Pages 77-86, ISSN 0021-9517, https://doi.org/10.1006/jcat.1995.1010. (http://www.sciencedirect.com/science/article/pii/S002195178571010X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78888
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Jul 2017 17:14
Last Modified:15 Nov 2021 17:43

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