Catalytic performance and stability of (V) MIL-47 and (Ti) MIL-125 in the oxidative desulfurization of heterocyclic aromatic sulfur compounds

McNamara, Nicholas D.; Neumann, Gregory T.; Masko, Erin T.; Urban, Jacqueline A.; Hicks, Jason C.

doi:10.1016/j.jcat.2013.05.021

Cited by 153 publications

(114 citation statements)

References 42 publications

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“…This Ea value is higher than those reported in the literature for analogous DBT oxidation by TBHP using MIL-47(V) or MIL-125(Ti) that were estimated as 51 and 75 kJ mol -1 , respectively. 32 Considering that organic peroxides are more reactive than molecular oxygen, the higher Ea value is not unexpected for the present aerobic oxidation. One additional experiment in where the amount of catalyst is increased resulted in a further decrease of the induction period as well as the final reaction time.…”

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confidence: 53%

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

et al. 2016

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MIL-101 promotes the aerobic oxidation in n-dodecane of dibenzothiophene (DBT) and its methyl-substituted derivatives to their corresponding sulfone with complete selectivity, without observation of the sulfoxide. DBT sulfones can be completely separated from n-dodecane by water extraction. MIL-101(Cr) without the need of pre-activation was found more convenient than the also-active MIL-101(Fe) analog. The reaction exhibits an induction period due to the diffusion inside the pore system of the solvent or oxygen and it is not observed if the MIL-101 sample is first contacted with the solvent at the reaction temperature for sufficiently long times. MIL-101 is reusable for at least five times without any sign of deactivation according to the time-conversion plots. Evidence by electron paramagnetic resonance spectroscopy detecting the hydroperoxide radical adduct with a spin trapping agent and Raman spectroscopy detection of superoxide supports that the process is an autooxidation reaction initiated by MIL-101 following the expected radical chain mechanism inside the MIL-101 cages.

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confidence: 53%

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

et al. 2016

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“…Hicks et al. evaluated the activities of MIL‐125 and MIL‐47 in ODS reactions of heterocyclic aromatic sulfur compounds . Garcia et al.…”

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confidence: 99%

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

et al. 2017

ChemPhysChem

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Oxidative desulfurization is considered to be one of the most promising methods for producing ultra-low-sulfur fuels because it can effectively remove refractory sulfur-containing aromatic compounds under mild conditions. In this work, the oxidative desulfurization performance over UiO-66(Zr) is greatly enhanced by Ti ion exchange. This strategy is not only efficient for UiO-66(Zr) with crystal defects but also for UiO-66(Zr) with high crystallinity. In particular, the performance of UiO-66(Zr) with high crystallinity in the oxidative desulfurization of dibenzothiophene can be improved more than 11-fold, which can be mainly attributed to the introduction of active Ti sites.

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“…Initially, we investigated the successful coordination of transition metal ions to the amino group of Ti‐MOF by Fourier‐transform infrared spectroscopy (FT‐IR) analysis. As shown in Figure , the peaks appeared at 1242 and 1620 cm −1 are assigned to bending vibrations of C–N and N–H, respectively . Notably, after coordination of transition metal ions with –NH 2 group of Ti‐MOF, the peak intensity of C–N and N–H bending vibrations is gradually decreased, which can be attributed to NM bond formation between –NH 2 group and M 2+ ions and weaken the NH and CN bonds due to electron transfer to M 2+ ions from –NH 2 group .…”

Section: Resultsmentioning

confidence: 91%

Amine Functionalized Metal–Organic Framework Coordinated with Transition Metal Ions: d–d Transition Enhanced Optical Absorption and Role of Transition Metal Sites on Solar Light Driven H₂ Production

Karthik

Neppolian

Vinu

et al. 2019

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Design and development of efficient photocatalysts for H2 production from water and sunlight have gained significant attention as the solar assisted approach is considered to be a promising approach for the generation of clean fuel. However, the poor charge carrier separation and light harvesting ability of existing photocatalysts limits the efficiency of photoconversion of water. In this work, the synthesis of transition metal ions (M2+ = Co2+, Cu2+, and Ni2+) coordinated with Ti‐metal organic frameworks (Ti‐MOFs) through a simple post‐synthetic coordination method for efficient solar light‐driven H2 production is reported. Notably, coordination of M2+ ions with Ti‐MOF significantly improves the optical absorption by d–d transitions and the multimetal sites facilitate the fast charge carrier separation, thereby enhancing the solar light‐driven H2 production activity. Very interestingly, the rate of solar light‐driven H2 production is varied with respect to different metal ions coordination due to the position of d–d bands absorption in the solar spectrum, and the complexing tendency of M2+ ions with sacrificial electron donors. A maximum solar H2 production rate of 1583.55 µmol h−1 g−1 is achieved with a Cu2+ coordinated Ti‐MOF, which is ≈13 fold higher than that of the pristine Ti‐MOF.

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Catalytic performance and stability of (V) MIL-47 and (Ti) MIL-125 in the oxidative desulfurization of heterocyclic aromatic sulfur compounds

Cited by 153 publications

References 42 publications

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

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

Amine Functionalized Metal–Organic Framework Coordinated with Transition Metal Ions: d–d Transition Enhanced Optical Absorption and Role of Transition Metal Sites on Solar Light Driven H₂ Production

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Catalytic performance and stability of (V) MIL-47 and (Ti) MIL-125 in the oxidative desulfurization of heterocyclic aromatic sulfur compounds

Cited by 153 publications

References 42 publications

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

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

Amine Functionalized Metal–Organic Framework Coordinated with Transition Metal Ions: d–d Transition Enhanced Optical Absorption and Role of Transition Metal Sites on Solar Light Driven H2 Production

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Amine Functionalized Metal–Organic Framework Coordinated with Transition Metal Ions: d–d Transition Enhanced Optical Absorption and Role of Transition Metal Sites on Solar Light Driven H₂ Production