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Highly efficient adsorption of benzothiophene from model fuel on a metal-organic framework modified with dodeca-tungstophosphoric acid
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Institute of Process Engineering, Chinese Academy of Sciences, China.ORCID iD: 0000-0002-7284-2974
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Number of Authors: 82019 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 362, p. 30-40Article in journal (Refereed) Published
Abstract [en]

Reduction of sulfur-containing compounds from fossil fuel is vital. This work reports on the adsorptive removal of benzothiophene (BT) from liquid fuel using a highly porous metal-organic framework based on a bicomponent zirconium(IV) benzene-tricarboxylate Zr(BTC), and its post-synthetically modified hybrid form with dodeca-tungstophosphoric acid (HPW/Zr(BTC). The HPW loading for the high-performing hybrid adsorbents was 0.5-2.0 wt/wt of W/Zr. Temperature and concentration dependent BT adsorption data were in good agreement with the non-linear Langmuir model combined with a van't Hoff description of the heat of adsorption. The maximum predicted adsorption capacities were estimated to be 290 and 238 mg.g(-1) for HPW(1.5)/Zr(BTC) and Zr(BTC) comparable to the contemporary reported adsorbents. The adsorption kinetics followed a pseudo-second order model, which was related to the low concentration of BT used for these studies. Although the highly porous Zr(BTC) had good adsorptive sites, its adsorption capacity was enhanced by incorporation of HPW, this was attributed to availability of added acid sites for adherence of basic BT. The adsorption findings were further corroborated with DFT calculations, which showed favorable BT adsorption with calculated binding energies of -140.2 and -47.3 kJ.mol(-1) for HPW(1.5)/Zr(BTC) and Zr(BTC), respectively. Much of adsorption sites were retained after regeneration of adsorbents.

Place, publisher, year, edition, pages
2019. Vol. 362, p. 30-40
Keywords [en]
Metal-organic frameworks, Adsorptive desulfurization, Dodeca-tungstophosphoric acid, Zirconium tricarboxylate, DFT calculations
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166646DOI: 10.1016/j.cej.2018.12.141ISI: 000457863500004OAI: oai:DiVA.org:su-166646DiVA, id: diva2:1295304
Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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