Issue 16, 2023

Peroxomolybdate@MOFs as effective catalysts for oxidative desulfurization of fuels: correlation between MOF structure and catalytic activity

Abstract

The highly active peroxomolybdate, TBA3{PO4[MoO(O2)2]4}·3H2O (abbreviated as PMo4), was incorporated for the first time in various porous MOF support structures (MIL-101, MOF-808, and ZIF-8) to form heterogeneous catalysts with different structural properties. These catalysts were used to treat a multicomponent model diesel via an oxidative desulfurization process. Sulfur-free diesel could be obtained after only 2 h depending on the porous MOF structural morphology. The size of the window entrance and the dimension of the pore from the MOF support had a remarkable influence on the catalytic performance of PMo4@MOF catalysts, and thus, the conditioning of reactant diffusion. PMo4@MIL-101 presented the highest catalytic efficiency (100% after 2 h), followed by PMo4@MOF-808 (73.1% at 2 h) and PMo4@ZIF-8 (68.1% at 2 h). Furthermore, the most active catalyst, PMo4@MIL-101, showed remarkable recycle capacity and structural stability (maintaining the activity and stability for 10 catalytic cycles). Appropriate window and pore size cavities from MIL-101 support were the most suitable for organosulfur oxidation. Smaller windows and pore sizes from the other MOFs caused a decrease in catalytic efficiency. The windows and porous dimensions from MOF-based catalysts have a direct effect on catalyst performance, and these must be adjusted to reactants and active guest centers to avoid leaching and allow a fluent diffusion of reactants, mainly the ones with large molecular sizes.

Graphical abstract: Peroxomolybdate@MOFs as effective catalysts for oxidative desulfurization of fuels: correlation between MOF structure and catalytic activity

Article information

Article type
Paper
Submitted
05 Apr 2023
Accepted
24 Jun 2023
First published
26 Jun 2023
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2023,13, 4785-4801

Peroxomolybdate@MOFs as effective catalysts for oxidative desulfurization of fuels: correlation between MOF structure and catalytic activity

Y. Gao, C. M. Granadeiro, L. Cunha-Silva, J. Zhao and S. S. Balula, Catal. Sci. Technol., 2023, 13, 4785 DOI: 10.1039/D3CY00467H

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