Desulfurization of model diesel by extraction/oxidation using a zinc-substituted polyoxometalate as catalyst under homogeneous and heterogeneous (MIL-101 (Cr) encapsulated) conditions

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Diana Juliao (Author) Other; Ana C Gomes (Author) Other; Martyn Pillinger (Author) Other; Luis Cunha Silva (Author) Other; Baltazar de Castro (Author) FCUP; Isabel S Goncalves (Author) Other; Salete S Balula (Author) Other

Journal

Title: Fuel Processing Technology

Vol. 131

Pages: 78-86

ISSN: 0378-3820

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 61 Citations

Scopus - 51 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-00A-6TB

DOI: 10.1016/j.fuproc.2014.10.030

Abstract (EN): A composite material comprising the chromium terephthalate metal-organic framework MIL-101 and the tetrabutylammonium (TBA) salt of a zinc-substituted polyoxotungstate anion, TBA(4.2)H(0.8)[PW11Zn(H2O)O-39] ( denoted PW11Zn), has been prepared by an impregnation method and characterized by powder X-ray diffraction, scanning electron microscopy, N-2 adsorption/desorption, thermogravimetric analysis, FT-IR, FT-Raman and P-31 magic-angle spinning (MAS) NMR spectroscopies. The characterization data reveal that the polyoxometalate was homogeneously encapsulated within the cages of the support without affecting its crystalline structure and morphology. Both the homogeneous catalyst PW11Zn and the composite material PW11Zn@MIL-101 exhibit high activity in the extractive and catalytic oxidative desulfurization of a model oil containing dibenzothiophene, 1-benzothiophene and 4,6-dimethyldibenzothiophene. Complete desulfurization of the model oil could be achieved within 2 h by using the ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate as extraction solvent, aqueous 30% H2O2 as oxidant and a reaction temperature of 50 degrees C. When acetonitrile was used as extraction solvent instead of the IL, the heterogeneous catalyst PW11Zn@MIL-101 could be easily recovered and reused several times without leaching or loss of activity. (C) 2014 Elsevier B.V. All rights

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9