Mono-substituted silicotungstates as active catalysts for sustainable oxidations: homo- and heterogeneous performance

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Salete S Balula (Author) Other; Luis Cunha Silva (Author) Other; Isabel C M S Santos (Author) Other; Ana C Estrada (Author) Other; Fernandes, AC (Author) Other; Jose A S Cavaleiro (Author) Other; Joao Pires (Author) Other; Cristina Freire (Author) FCUP; Ana M V Cavaleiro (Author) Other

Journal

Title: New Journal of Chemistry

Vol. 37

Pages: 2341-2350

ISSN: 1144-0546

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-006-G3S

DOI: 10.1039/c3nj00243h

Abstract (EN): A series of tetrabutylammonium (TBA) salts of the transition metal mono-substituted silicotungstates [SiW11M(H2O)O-39](n-), M = Co-II, Fe-III, Mn-III, (SiW11M) were explored as homogeneous catalysts for the oxidation of geraniol and styrene with H2O2. The most active homogeneous catalysts (SiW11Co and SiW11Fe) were immobilized onto an amine-functionalized SBA-15 (aptesSBA-15) and the resulting composites were characterized using several techniques (FT-IR, FT-Raman, UV-Vis/DRS, elemental analysis, powder XRD, SEM and N-2 adsorption-desorption isotherms). The catalytic performance of the new composites SiW11Co@aptesSBA-15 and SiW11Fe@aptesSBA-15 was investigated under similar experimental conditions to those used for homogeneous counterparts. 2,3-Epoxygeraniol and benzaldehyde were the main products obtained from geraniol and styrene oxidation, respectively, for all the catalysts. SiW11Co and SiW11Co@aptesSBA-15 showed to be the most active catalysts for the oxidation of geraniol and styrene. The recyclability of the composite SiW11Co@aptesSBA-15 was investigated for three reaction cycles. The stability of the composites was confirmed using several techniques after catalytic cycles.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10