The Crystal Structure of Mo17O47.

Kihlborg, L. H. E.; Hasselquist, Hans; Larsson, Lennart; Dodson, R. M.

doi:10.3891/acta.chem.scand.14-1612

Cited by 56 publications

(42 citation statements)

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“…We will use as a typical example for Mo 5? , the Mo 17 O 47 structure refined by Kihlborg [52,53], selecting an octahedral linking site that clearly has a bond valence sum very close to ?5.0. As a representative case for V 5?…”

Section: Oxidation States Of Metal Sitesmentioning

confidence: 98%

Improvement of the Structural Model for the M1 Phase Mo–V–Nb–Te–O Propane (Amm)oxidation Catalyst

et al. 2011

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An improved structural model for the M1 phase in the Mo-V-Nb-Te-O propane (amm)oxidation catalyst has been refined after accounting for a molybdenumsubstituted-V 2 O 5 impurity and by making adjustments based on aberration-corrected imaging results. The newly refined unit cell has Pba2 symmetry with a = 21.134(1) Å , b = 26.647(1) Å , c = 4.0140(2) Å , and Z = 4, in good agreement with our earlier findings (DeSanto et al. Top Catal 23:23 [20], DeSanto et al. Z Kristallogr 219:152[22]). From the newly refined occupancies, the formula unit is {TeO} 0.86(1) ÁMo 7.48(6) V 1.52(6) NbO 28 . As in the earlier models, V is concentrated in sites that link the pentagonal rings of M1. Careful analysis of bond valences, in combination with the electroneutrality constraint, suggest that the linking sites S3, S4, and S7 all have mixed Mo/V occupancies and valences (d 1 /d 0 ). Furthermore, these sites may contain a mix of Mo 5? and V 5? , which is consistent with the proposed catalytic mechanism in which V 5? plays an important role in propane activation.

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Section: Oxidation States Of Metal Sitesmentioning

confidence: 98%

Improvement of the Structural Model for the M1 Phase Mo–V–Nb–Te–O Propane (Amm)oxidation Catalyst

et al. 2011

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“…Although the final poorly crystalline Mo-oxide phases could not be directly identified, such species are not uncommon and have been observed in similar catalyst materials [48,[60][61][62][63][64][65]. In addition, the breakdown of the catalyst should result in iron sub-oxides (during reduction) and iron oxides (oxidation) [13,30] These are also not directly observed, however their presence can be inferred by the increase in CO 2 production during reduction as these phases are well known to catalyze methanol total oxidation [66,67].…”

Section: Phase Formationmentioning

confidence: 99%

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

et al. 2009

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A setup combining a number of techniques (WAXS, XANES and UV-Vis) has been used to probe the stability of an iron molybdate catalyst during redox cycling. The catalyst was first reduced under anaerobic methanol/ helium conditions, producing formaldehyde and then regenerated using air. Although in this test-case the catalyst and conditions differ from that of a commercial catalyst bed we demonstrate how such a setup can reveal new information on catalyst materials.

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“…The deviations are too great for using this system in a satisfactory CO 2 sensor. Reasons for the behaviour of this system have to be seen in the fact that MoO 3 easily loses oxygen [21] and probably reacts with the phosphate electrolyte. Thus the thermodynamic properties of participants of the cell reaction and with them U change their values.…”

Section: Resultsmentioning

confidence: 98%

Solid state systems for the potentiometric determination of CO 2

Möbius

Shuk

Zastrow

1996

Analytical and Bioanalytical Chemistry

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In a survey of solid state systems for the potentiometric determination of CO(2) their different fundamentals, possibilities and problems are demonstrated. Experimental results are given, obtained from sensors in which Na(2)CO(3) reacts electrochemically with an oxide forming the sodium salt thermodynamically stable in contact with it. Sensors with Na(2)YZr(PO(4)) as solid electrolyte and MoO(3) or SiO(2) did not yield long-term stable signals, probably mainly because of chemical reactions between the oxides and the solid electrolyte. Satisfactory results were obtained with galvanic cells represented by the symbol. Their standard cell tensions U* (= -emf*) determined with different test gases are in relatively good agreement with values thermodynamically calculated.

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The Crystal Structure of Mo17O47.

Cited by 56 publications

References 0 publications

Improvement of the Structural Model for the M1 Phase Mo–V–Nb–Te–O Propane (Amm)oxidation Catalyst

Improvement of the Structural Model for the M1 Phase Mo–V–Nb–Te–O Propane (Amm)oxidation Catalyst

A Combined Multi-Technique In Situ Approach Used to Probe the Stability of Iron Molybdate Catalysts During Redox Cycling

Solid state systems for the potentiometric determination of CO 2

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