Ruthenium isomorphic substitution into manganese oxide octahedral molecular sieve OMS-2: Comparative physic-chemical and catalytic studies of Ru versus abundant metal cationic dopants

Sabaté, Ferrán; Jordá, José L.; Sabater, Marı́a J.

doi:10.1016/j.cattod.2021.06.033

Cited by 7 publications

(9 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this context, it was observed that this weakening effect increased as the Ru content increased (Figure 11). In this regard, it is important to remark that the amount of Ru incorporated at the structural level in K-OMS-2 did not exceed 4.5% by weight [133], which is a significantly lower amount than that obtained for other smaller cations incorporated in the network (i.e., Co, Cu and Ni) [160,162,180]. As an example, the amount of Fe that can be incorporated in K-OMS-2 oxide ([Fe]-K-OMS-2) can reach up to 6% wt.…”

Section: [Ru]-k-oms-2mentioning

confidence: 88%

“…At this point, it is important to note that one of the most prominent aspects of this material is the reducibility, a property that is closely associated to the weakening of the Mn-O bond [108,133]. In this context, it was observed that this weakening effect increased as the Ru content increased (Figure 11).…”

Section: [Ru]-k-oms-2mentioning

confidence: 96%

“…Nonetheless, interestingly, it appears that the impact that Ti-doped K-OMS-2 oxide Indeed, Figure 12 shows the impressive effect that Ru has on the reducibility of K-OMS-2 with respect to a series of earth abundant metal cations assayed (i.e., Co, Ni, Cu and Fe). This impact has been attributed to a greater difference in size and properties of Ru versus Mn, with respect to more similar cations [108,133] This feature should have an impact on the catalytic applications, as it will be shown in Section 3.2.2.…”

Section: [Ti]-k-oms-2mentioning

confidence: 97%

“…As previously stated, OMS-2 material is an environmentally benign and relatively cheap manganese oxide with a wide range of interesting applications in the fields of environmental and sustainable energy [55,[116][117][118][119][120], electrocatalysis and energy storage [121][122][123][124][125], as well as catalysis for fine chemistry [112,[126][127][128][129][130][131][132][133]. As previously indicated, the wide variety of structures that OMS-2 oxide can adopt makes it easy for these materials to adjust to each specific application.…”

Section: Assessment Of Doping Processesmentioning

confidence: 99%

“…For this reason, it seemed an ideal cation to be incorporated into the structure of K-OMS-2 in order to obtain a material with attractive properties. In this context, [Ru]-K-OMS-2 was obtained through a reflux method [108,133] starting from manganese precursor salts combined with RuCl 3 × H 2 O.…”

Section: [Ru]-k-oms-2mentioning

confidence: 99%

See 4 more Smart Citations

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Sabaté

Sabater

2021

Catalysts

Self Cite

View full text Add to dashboard Cite

The present report describes the structural and physical–chemical variations of the potassium manganese oxide mineral, α–MnO2, which is a specific manganese octahedral molecular sieve (OMS) named cryptomelane (K–OMS–2), with different transition metal cations. We will describe some frequently used synthesis methods to obtain isomorphic substituted materials [M]–K–OMS–2 by replacing the original manganese cationic species in a controlled way. It is important to note that one of the main effects of doping is related to electronic environmental changes, as well as to an increase of oxygen species mobility, which is ultimately related to the creation of new vacancies. Given the interest and the importance of these materials, here, we collect the most recent advances in [M]–K–OMS–2 oxides (M = Ag, Ce, Mo, V, Nb, W, In, Zr and Ru) that have appeared in the literature during the last ten years, leaving aside other metal–doped [M]–K–OMS–2 oxides that have already been treated in previous reviews. Besides showing the most important structural and physic-chemical features of these oxides, we will highlight their applications in the field of degradation of pollutants, fine chemistry and electrocatalysis, and will suggest potential alternative applications.

show abstract

Section: [Ru]-k-oms-2mentioning

confidence: 88%

Section: [Ru]-k-oms-2mentioning

confidence: 96%

Section: [Ti]-k-oms-2mentioning

confidence: 97%

Section: Assessment Of Doping Processesmentioning

confidence: 99%

Section: [Ru]-k-oms-2mentioning

confidence: 99%

See 3 more Smart Citations

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Sabaté

Sabater

2021

Catalysts

Self Cite

View full text Add to dashboard Cite

show abstract

Improved catalytic performance of Ag-doped K-OMS-2 for soot oxidation

Nithya,

Vikram,

Dasari

et al. 2024

Appl. Phys. A

View full text Add to dashboard Cite

The catalytic behaviours of pure K-OMS-2 and Ag-doped K-OMS-2 catalysts (5% Ag doping) synthesized using the hydrothermal method are the focus of investigation in this study. To characterize the catalytic performance of these synthesized catalysts, a combination of analytical techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and Soot Temperature Programmed Reduction (Soot TPR), were employed. The analysis of the prepared samples via XRD revealed a nanocrystalline tetragonal structure, with crystal sizes measuring approximately 22.4 nm. Further examination of the samples using Field Emission Scanning Electron Microscopy (FESEM) unveiled nanorods with dimensions of 213 nm in length and 32 nm in width for K-OMS-2. In comparison, Ag-doped K-OMS-2 displayed nanorods with dimensions of 290 nm in length and 26 nm in width. Notably, the incorporation of Ag+ ions into the K-OMS-2 framework led to an increase in the intensities of the 771 and 527 cm−1 bands when compared to the pure K-OMS-2. This increase can be attributed to the replacement of K+ ions with Ag+ ions in the structure. Furthermore, the introduction of Ag+ ions into the K-OMS-2 framework significantly influenced its catalytic activity for soot oxidation, as evidenced by the augmentation of surface-adsorbed and lattice oxygen radicals, as observed in the results of Soot TPR. The doped sample exhibited substantially enhanced catalytic activity for soot oxidation, as indicated by its low T50 of 370 °C. In addition, the incorporation of the dopant was found to enhance the thermal stability of the catalyst. Graphical abstract

show abstract

Defective Ru-doped α-MnO2 nanorods enabling efficient hydrazine oxidation for energy-saving hydrogen production via proton exchange membranes at near-neutral pH

Sabaté

et al. 2023

Chemical Engineering Journal

View full text Add to dashboard Cite

Ruthenium isomorphic substitution into manganese oxide octahedral molecular sieve OMS-2: Comparative physic-chemical and catalytic studies of Ru versus abundant metal cationic dopants

Cited by 7 publications

References 86 publications

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

Improved catalytic performance of Ag-doped K-OMS-2 for soot oxidation

Defective Ru-doped α-MnO2 nanorods enabling efficient hydrazine oxidation for energy-saving hydrogen production via proton exchange membranes at near-neutral pH

Contact Info

Product

Resources

About