Synthesis of Orthorhombic Mo‐V‐Sb Oxide Species by Assembly of Pentagonal Mo<sub>6</sub>O<sub>21</sub> Polyoxometalate Building Blocks

Sadakane, Masahiro; Yamagata, Keiko; Kodato, Katsunori; Endo, Keisuke; Toriumi, Koshiro; Ozawa, Yoshiki; Ozeki, Tomoji; Nagai, Takuro; Matsui, Y.; Sakaguchi, Norihito; Pyrz, William D.; Buttrey, Douglas J.; Blom, Douglas A.; Vogt, Thomas; Ueda, Wataru

doi:10.1002/anie.200805792

Cited by 100 publications

(89 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our findings further confirm the idea that oxidic bronze structures could be designed via assembling of pentagonal Mo 6 O 21 building block [56] that is rather famous in polymolybdate chemistry and was found in several giant polyoxomolybdate molecules [57]. However for the studied system the particular process of pentagonal block formation from the mixture of starting water solutions of ammonia paramolybdate, ammonia metavanadate and niobium oxalate is still not clear.…”

Section: Discussionsupporting

confidence: 89%

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors

Kardash¹,

Plyasova

Kochubey

et al. 2012

Zeitschrift für Kristallographie

View full text Add to dashboard Cite

A combination of X-ray and neutron PDF measurements with powder diffraction and EXAFS data was used to determine the structures of a V--Mo--Nboxide catalyst and its poorly crystallized precursors that exhibit the strongest catalytic activities. The crystalline material belongs to space group P42 1 m, a ¼ 22.8, c ¼ 4.002, and is build up of pentagonal MeO 7 bipyramids surrounded by edge sharing Me-octahedrons (Me ¼ Mo, V, Nb). In the average structure all MeO 7 units are at the same z-level, while the local structure analysis shows systematic shifts along [001]. Samples synthesized at 300 C and 400 C exhibit a nanostructure, whose local structure predates the final crystalline structure. Initial nanoparticles are spherical and grow predominantly along the c-axis. The successful analysis required a reverse analysis that took the crystalline material as starting model for the samples synthesized at lower temperatures.

show abstract

Section: Discussionsupporting

confidence: 89%

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors

Kardash¹,

Plyasova

Kochubey

et al. 2012

Zeitschrift für Kristallographie

View full text Add to dashboard Cite

show abstract

“…Thus, catalysts presenting the orthorhombic phase, the so-called M1 phase, have been proposed as active and selective in the partial oxidation of both alkane and olefins [15][16][17][18][19][20][21][22], while catalysts presenting hexagonal phase, the so-called M2 phase, are active and selective in olefin partial oxidation [23]. More recently, catalysts presenting tetragonal phase, TTB, have been reported as active and selective in partial oxidation of C 3 -C 4 olefins [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Mo-based oxidic bronzes have been recently reported as active and selective in the partial oxidation of short chain alkanes and olefins, although their crystalline structure and composition strongly influence their catalytic behaviour [15][16][17][18][19][20][21][22][23][24][25]. Thus, catalysts presenting the orthorhombic phase, the so-called M1 phase, have been proposed as active and selective in the partial oxidation of both alkane and olefins [15][16][17][18][19][20][21][22], while catalysts presenting hexagonal phase, the so-called M2 phase, are active and selective in olefin partial oxidation [23].…”

Section: Introductionmentioning

confidence: 99%

Partial Oxidation of H2S to Sulfur Over Mo and/or W-Containing Bronzes with a TTB-Structure

et al. 2011

View full text Add to dashboard Cite

Mo-and W-based oxidic bronzes, with and without Te-atoms in framework positions are active and selective, for the partial oxidation of H 2 S to sulfur in the 160-220°C temperature range. The catalysts have been prepared by a hydrothermal synthesis and heat-treated in N 2 at 600°C, and characterized by several physico-chemical techniques, i.e. AAS, S BET , XRD, SEM-EDX, DR UV-vis and XPS. Te-free catalysts are active, selective and stable for the partial oxidation of H 2 S to sulfur. V-atoms in Mo-O-V pairs can be proposed as the active sites. Moreover, Te-containing materials show fast catalyst decay. This catalyst deactivation can be related to the presence of Te 0 and MoS 2 , which are observed in used catalyst.

show abstract

“…[2b] In the latter context, it should be stressed that moving from conventional to nanovessels is not just a matter of size as the behavior of molecules in nanospaces is quite different from their behavior under bulk conditions. [3,4] Here we will focus on the porous spherical metal oxide based capsules that obey a simple Aufbau Principle (pentagon) 12 (linker) 30 = {(M) VI M VI 5 } 12 {Mo V 2 (ligand)} 30 (with differ-ent ligands; M = Mo, W), that is, a special type of Keplerates, [5a] and have many attractive features: 1) They are soluble in water, which is the preferred solvent because of its biological relevance, [4b, 6] but can also be rendered soluble in organic solvents by cation exchange. 2) They can be easily obtained [5b,c] according to the basic principles of constitutional dynamic chemistry.…”

Section: Introductionmentioning

confidence: 99%

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Müller

Gouzerh

2014

Chemistry A European J

View full text Add to dashboard Cite

Spherical porous capsules offer new exciting approaches in chemistry, materials sciences, and in context of physical and biological phenomena. The underlying concepts are reported with particular emphasis on metal oxide based capsules of the {M132 } Keplerate type which display-due to their exceptional structural features and easy variation/derivatization as well as exchange of building units-an unmatched range of properties and offer unique opportunities for investigating a variety of basic aspects of nanoscience, including the discovery of some new phenomena, especially those related to hydrophobicity issues that are of significance for everyday life. This relies in particular on the existence of a large number of flexible crown ether type pores/channels and the possibility of changing the interior from completely hydrophilic to completely hydrophobic due to the presence of numerous easily exchangeable internal ligands/functionalities; the capsules can even be constructed so that they enclose a large number of highly active Lewis and Brønsted acid sites. The manifold of possible applications/uses are outlined as subtitles with reference to results as well as possible future studies. There are, among many others, options to control passing cations under different internal frames allowing also their separations, to conduct studies about hydrophobic recognitions and clustering of biological interest in water, controlled internal ion transport, nanoscale dewetting, and to carry out basic as well as new types of reactions under confined conditions.

show abstract

Synthesis of Orthorhombic Mo‐V‐Sb Oxide Species by Assembly of Pentagonal Mo₆O₂₁ Polyoxometalate Building Blocks

Cited by 100 publications

References 40 publications

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors

Partial Oxidation of H2S to Sulfur Over Mo and/or W-Containing Bronzes with a TTB-Structure

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Contact Info

Product

Resources

About

Synthesis of Orthorhombic Mo‐V‐Sb Oxide Species by Assembly of Pentagonal Mo6O21 Polyoxometalate Building Blocks

Cited by 100 publications

References 40 publications

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo5O14-like structure during synthesis from nanostructured precursors

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo5O14-like structure during synthesis from nanostructured precursors

Partial Oxidation of H2S to Sulfur Over Mo and/or W-Containing Bronzes with a TTB-Structure

Capsules with Highly Active Pores and Interiors: Versatile Platforms at the Nanoscale

Contact Info

Product

Resources

About

Synthesis of Orthorhombic Mo‐V‐Sb Oxide Species by Assembly of Pentagonal Mo₆O₂₁ Polyoxometalate Building Blocks

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors

Development of the local and average structure of a V–Mo–Nb oxide catalyst with Mo₅O₁₄-like structure during synthesis from nanostructured precursors