Iron(III)-substituted polyoxotungstates immobilized on silica nanoparticles: Novel oxidative heterogeneous catalysts

  1. Home

abstract

Silica nanoparticles supporting polyoxometalates (POMs), namely an iron(III) mono-substituted Keggin-type polyoxotungstate of formula alpha-[PW(11)Fe(III)(H(2)O)O(39)](4-) and a sandwich-type tungstophosphate with the formula B-alpha-[(PW(9)O(34))(2)Fe(4)(III)(H(2)O)(2)](6-) were synthesized. The POM/SiO(2) nanocomposites were obtained by alkaline hydrolysis of tetraethoxysilane using a reverse micelle and sol-gel technique. The spectroscopic studies suggest that the POMs were successfully immobilized on the silica nanoparticles. The catalytic activity of POM/SiO(2) nanomaterials was tested in the epoxidation of geraniol using H(2)O(2) as oxygen donor. The alpha-[PW(11)Fe(III)(H(2)O)O(39)](4-)/SiO(2) nanocomposite was the most efficient catalyst with high geraniol conversion and good regioselectivity for 2,3-epoxygeraniol. (C) 2010 Elsevier B.V. All rights reserved.

keywords

IRON-SUBSTITUTED POLYOXOTUNGSTATES; HYDROGEN-PEROXIDE; CATIONIC SILICA; POLYOXOMETALATE CLUSTERS; AEROBIC OXIDATIONS; ALLYLIC ALCOHOLS; AMORPHOUS SILICA; EPOXIDATION; CHEMISTRY; H2O2

subject category

Chemistry

authors

Sousa, JLC; Santos, ICMS; Simoes, MMQ; Cavaleiro, JAS; Nogueira, HIS; Cavaleiro, AMV

our authors

foto Ana Maria Vieira Silva Viana Cavaleiro

Ana Maria Vieira Silva Viana Cavaleiro

Full professor
foto Helena Isabel Seguro Nogueira

Helena Isabel Seguro Nogueira

Assistant Professor
foto Isabel Cristina Maia da Silva Santos Vieira

Isabel Cristina Maia da Silva Santos Vieira

Researcher
foto Joana Lia Cardoso de Sousa

Joana Lia Cardoso de Sousa

Post-Doc Fellowship

Groups

1 - Inorganic Functional Nanomaterials and Organic-Inorganic Hybrids
4 - Biorefineries, Biobased Materials and Recycling

acknowledgements

Thanks are due to the University of Aveiro and FCT/FEDER for funding CICECO and QOPNA.

Share this project:

Related Publications

Publication Details

type
Journal Article
year
2011
journal
CATALYSIS COMMUNICATIONS
volume
12
publisher
ELSEVIER SCIENCE BV
issn
1566-7367
issue
6
digital object identifier
10.1016/j.catcom.2010.11.005
web of science article identifier
WOS:000287289000016

Journal Metrics (JCR 2019)

Journal Impact Factor
3.612
Journal Impact Factor (5 yrs)
3.458
category normalized journal percentile
60.692

Citations

Social Interaction

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".


Privacy and Cookie Policy

Personal data

CICECO-Aveiro Institute of Materials respects your privacy, ensuring confidentiality of personal data you share with the institution through this way, not collecting any personal information about you without your consent, under the terms required by General Data Protection Regulations (RGPD).

The data collected in forms are intended exclusively for processing user requests and will not be used for any other purpose, always safeguarding their confidentiality, under the terms of the protection conferred by the aforementioned regulation.

The collection and processing of data is the responsibility of CICECO and its storage is properly protected, only authorized CICECO employees can access the information within the scope of their functions, always being clear in the respective collection forms the purposes for which they are intended. The remaining issues to be considered in this matter will be handled by the University of Aveiro in accordance with the regime established by the GDPR.

Cookies policy

Cookies are small files with alphanumeric information that are stored on your computer's hard drive by your browser and are intended to improve the user experience and enhance website navigation.

Collection and use of technical information

The cookies used on CICECO are anonymous, and no information about our users that allows their personal identification is stored in them.

The technical information recorded consists of:

  • iP (Internet Protocol) address of the visitor;
  • the type of internet browser used by the website visitor and the respective operating system used;
  • the date and time of the consultation;
  • the pages visited on the site and the documents downloaded
  • The technical information collected is used for statistical purposes only.

Cookies used

Session cookies

These cookies are used to record user preferences, such as the language in which websites are displayed or to maintain authenticated user sessions, and are automatically deleted when the browser is closed.

Persistent cookies

These cookies store information that is needed between sessions. For example, a persistent cookie is set to record that you have been made aware of the cookie policy so that the message regarding this policy is not shown again the next time you visit the website. This cookie remains on the computer until it reaches its expiry date or is deleted by the user.

Data protection

The present privacy policy covers the Information System of the University of Aveiro (SIUA), governed by the General Data Protection Regulations (RGPD) Regulation (EU) No. 2016/679, of April 27th, 2016.

Data Protection Officer

The University of Aveiro has a Data Protection Officer (DPO), who ensures compliance of the processing of personal data with the legislation in force, and is available through the following email address epd@ua.pt.

Close