Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation

Iyer, A. N.; Galindo, H.; Sithambaram, Shanthakumar; King’ondu, Cecil K.; Chen, Chun‐Hu; Suib, Steven L.

doi:10.1016/j.apcata.2010.01.012

Cited by 91 publications

(57 citation statements)

References 33 publications

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“…Figure 2 shows the typical FT-IR spectra of the OMS-2 and xPd/OMS-2 samples. All of the materials presented the vibrations typical of OMS-2 at 400-800 and 1620 cm -1 , as reported in the literature [11]. The bands at around 700, 600, 520, and 450 cm -1 characteristic of cryptomelane were assigned to the Mn-O lattice vibrations of the MnO 6 octahedral framework.…”

Section: Results and Disscussionmentioning

confidence: 73%

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

Fu¹,

Li²,

Song³

et al. 2017

Front. Chem. Sci. Eng.

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The Pd catalyst supported on cryptomelanetype manganese oxide octahedral molecular sieve (OMS-2) were prepared. The effect of Pd loading on the catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over xPd/OMS-2 has been investigated. The results show that the Pd loading plays an important role on the physicochemical properties of the xPd/OMS-2 catalysts which outperform the Pd-free counterpart with the 0.5Pd/ OMS-2 catalyst being the best. The temperature for 50% conversion was 25, 240 and 160°C, and the temperature for 90% conversion was 55, 285 and 200°C for oxidation of CO, toluene, and ethyl acetate, respectively. The lowtemperature reducibility and high oxygen mobility of xPd/ OMS-2 are the factors contributable to the excellent catalytic performance of 0.5Pd/OMS-2.

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Section: Results and Disscussionmentioning

confidence: 73%

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

Fu¹,

Li²,

Song³

et al. 2017

Front. Chem. Sci. Eng.

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“…[34,38] Our calculations showed that each donated electron is shared by several Mn, resulting in non-integer charges on the Mn. We calculated the electronic structures of undoped and doped α-MnO2 and compared them to provide detailed insight into the cation effect on the molecular orbitals of the α-MnO2.…”

Section: Resultsmentioning

confidence: 99%

Carbon dioxide sorption in a nanoporous octahedral molecular sieve

Williamson¹,

Nelson²,

Li³

2015

J. Phys. D: Appl. Phys.

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We have performed first-principles density functional theory calculations, incorporated with van der Waals interactions, to study CO2 adsorption and diffusion in nanoporous solid -OMS-2 (Octahedral Molecular Sieve). We found the charge, type, and mobility of a cation, accommodated in a porous OMS-2 material for structural stability, can affect not only the OMS-2 structural features but also CO2 sorption performance. This paper targets K + , Na + , and Ba 2+ cations. First-principles energetics and electronic structure calculations indicate that Ba 2+ has the strongest interaction with the OMS-2 porous surface due to valence electrons donation to the OMS-2 and molecular orbital hybridization. However, the Ba-doped OMS-2 has the worst CO2 uptake capacity. We also found evidence of sorption hysteresis in the K-and Nadoped OMS-2 materials.

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“…K-OMS-2 was synthesized by the reflux method [15][16][17][18]. The KMnO 4 solution (44.3 mg/mL) was added to a mixture of MnSO 4 ·H 2 O solution (66 mg/mL) and concentrated HNO 3 (1.36 mL).…”

Section: Catalyst Synthesismentioning

confidence: 99%

A Non-Precious Metal Promoting the Synthesis of 5-Hydroxymethylfurfural

Zhao

Feng

et al. 2017

Catalysts

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Abstract:In this work, a new kind of catalyst was prepared for synthesis of 5-hydroxymethylfurfural. Copper ions were incorporated into manganese oxide octahedral molecular sieves (K-OMS-2). The catalysts Cu-K-OMS-2 were characterized by measuring FTIR spectra, scanning electron microscope images, X-ray diffraction patterns, and temperature-programmed desorption (TPD) and temperature-programmed reduction (TPR) profiles. Thermogravimetric analysis (TGA) demonstrated that the stability of Cu-K-OMS-2 is almost the same as that of K-OMS-2. XRD patterns showed that introducing copper ions did not change the structure of K-OMS-2, but copper ions had an effect on the morphology of K-OMS-2 as illustrated by SEM images. TPD profiles demonstrated that both K-OMS-2 and Cu-K-OMS-2 possess basic and acidic sites, and Cu-K-OMS-2 has weak acidic sites. One-pot synthesis of 2,5-diformylfuran (DFF) from fructose was investigated under the catalysis of Cu-K-OMS-2 together with a commercial catalyst Amberlyst 15. The effect of reaction time and temperature on the DFF yield was investigated, and reaction temperature had an effect on the DFF yield. The effect of atomic ratio of Cu to Mn of Cu-K-OMS-2 on the DFF yield was also investigated. The DFF yield was improved 34.7% by Cu-K-OMS-2 in comparison to K-OMS-2, indicating the promotion effect of copper on the DFF yield. Consecutive use of Cu-K-OMS-2 demonstrated that after 6 cycles, the loss of DFF yield was 6.3%, indicating a good reusability of Cu-K-OMS-2.

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Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation

Cited by 91 publications

References 33 publications

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the xPd/OMS-2 catalysts: Effect of Pd loading

Carbon dioxide sorption in a nanoporous octahedral molecular sieve

A Non-Precious Metal Promoting the Synthesis of 5-Hydroxymethylfurfural

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