Application of Two Cobalt-Based Metal–Organic Frameworks as Oxidative Desulfurization Catalysts

Abstract

Two new porous cobalt-based metal-organic frameworks, [Co6(oba)5(OH)2(H2O)2(DMF)4]n · 5DMF (TMU-10) and [Co3(oba)3(O) (Py)0.5] n · 4DMF · Py (TMU-12) have been synthesized by solvothermal method using a nonlinear dicarboxylate ligand. Under mild reaction conditions, these compounds exhibited good catalytic activity and reusability in oxidative desulfurization (ODS) reaction of model oil which was prepared by dissolving dibenzothiophene (DBT) in n-hexane. FT-IR and Mass analysis showed that the main product of DBT oxidation is its corresponding sulfone, which was adsorbed on the surfaces of catalysts. The activation energy was obtained as 13.4 kJ/mol.

Enhancement of Oxidative Desulfurization Performance over UiO‐66(Zr) by Titanium Ion Exchange

“…For example, Morsali et al. synthesized two cobalt‐based MOFs and studied their performance in the ODS reaction of DBT . Hicks et al.…”

“…For example, Morsali et al synthesized two cobalt-based MOFs and studied their performance in the ODS reaction of DBT. [28] Hicks et al evaluated the activities of MIL-125 and MIL-47 in ODS reactions of heterocyclic aromatic sulfur compounds. [29,30] Garcia et al investigated the aerobic ODS of DBT by using MIL-101(Cr) as acatalyst.…”

Exfoliating Polyoxometalate‐Encapsulating Metal‐Organic Framework into Two‐Dimensional Nanosheets for Superior Oxidative Desulfurization

“…We note that conversion of 90 % over pristine MOF occurs within first 1 h. The subsequent reaction of low rate is ascribed to kinetic factor owing to decreasing concentration of DBT in reaction process (See details in SI). As demonstrated in Figure c, catalytic oxidation of DBT by POM−Co‐MOF in both bulk and nanosheets is determined to be pseudo‐first‐order reaction, where H 2 O 2 is in excess so its concentration is considered to be constant during the reaction ,…”

“…As demonstrated in Figure 3c, catalytic oxidation of DBT by POMÀ Co-MOF in both bulk and nanosheets is determined to be pseudo-first-order reaction, where H 2 O 2 is in excess so its concentration is considered to be constant during the reaction. [29,[39][40] Taking the catalyst mass into account, we calculated turnover numbers (TON) for ODS reactions over bulk and exfoliated samples (see details in SI). The plot of TON verse different reaction time for both samples is shown in Figure 3d.…”

Ultrasonic assisted synthesis of two new coordination polymers and their applications as precursors for preparation of nano-materials

“…Metal coordination polymers have been studied widely during past two decades because of their potential applications in catalysis, molecular adsorption, magnetism, nonlinear optics, luminescence, and molecular sensing [1][2][3][4][5][6][7]. These materials are highly attractive as they can be designed in various architectures.…”