Oxidative catalytic versatility of a trivacant polyoxotungstate incorporated into MIL-101(Cr)

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Carlos M Granadeiro (Author) Other; Andre D S Barbosa (Author) Other; Susana Ribeiro (Author) Other; Isabel C M S Santos (Author) Other; Baltazar de Castro (Author) FCUP; Luis Cunha Silva (Author) Other; Salete S Balula (Author) Other

Journal

Title: Catalysis Science and Technology

Vol. 4

Pages: 1416-1425

ISSN: 2044-4753

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 37 Citations

Scopus - 4 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-009-9ZV

DOI: 10.1039/c3cy00853c

Abstract (EN): The first immobilization of the trivacant Keggin-type polyoxometalate ([A-PW9O34](9-), PW9) to prepare a novel heterogeneous oxidative catalyst is here reported. PW9 was incorporated into the cavities of the chromium terephthalate metal-organic framework MIL-101(Cr). Characterization of the composite PW9@MIL-101 by powder X-ray diffraction, SEM-EDX, FT-IR, FT-Raman spectroscopy, N-2 adsorption-desorption isotherms and P-31 solid-state NMR confirmed that the structures of MIL-101 and the polyoxometalate anion were retained after immobilization. The composite PW9@MIL-101 revealed versatility as a heterogeneous catalyst to oxidize efficiently monoterpenes as well as to reach a complete desulfurization of a model oil containing the most refractory sulfur compounds in fuel, using in both systems acetonitrile as the solvent and H2O2 as the oxidant. Complete conversion of geraniol to 2,3-epoxygeraniol was achieved after the first 30 min at room temperature, while the total desulfurization of the model oil containing 1707 ppm of sulfur was attained after 2 h. In both systems the catalyst was recyclable for various cycles without a significant loss of activity. The stability and heterogeneity of the catalyst were confirmed by several techniques and by leaching tests.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10