The investigation of chemical and phase composition of solid precursor of MoVTeNb oxide catalyst and its transformation during the thermal treatment

Popova, G. Ya.; Андрушкевич, Т. В.; Довлитова, Л. С.; Aleshina, G.A.; Chesalov, Yu. A.; Ishenko, A.V.; Ishenko, E.V.; Plyasova, L. M.; Malakhov, V. V.; Khramov, M.I.

doi:10.1016/j.apcata.2008.10.060

Cited by 36 publications

(16 citation statements)

References 29 publications

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“…For comparison the spectra of Ga-free samples have been also included. All catalysts exhibit similar spectra to those 11 previously reported by other authors [11,[46][47][48]. , and a weak shoulder to higher frequencies, in the 900-930 cm -1 Raman region (Fig.…”

Section: Catalyst Characterizationsupporting

confidence: 76%

Preparation, characterization and catalytic behavior for propane partial oxidation of Ga-promoted MoVTeO catalysts

Hernández-Morejudo

Massó

García-González

et al. 2015

Applied Catalysis A: General

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ElsevierHernández Morejudo, S.; Masso Ramírez, A.; García-González, E.; Concepción Heydorn, P.; López Nieto, JM. (2015). Preparation, characterization and catalytic behavior for propanepartial oxidation of Ga-promoted MoVTeO catalysts. Applied Catalysis A: General. 504:51-61. doi:10.1016/j.apcata.2014.12.039. The results showed that the addition of small amount of gallium significantly increase the selectivity to acrylic acid (AA) at low propane conversion. However, at high propane conversion, the selectivity to AA strongly depends on both the catalyst composition and the gallium incorporation method. The higher selectivity to acrylic acid over Ga-containing MoVTeO catalysts has been related to: i) structural changes in the M1 phase by the incorporation of Ga 3+ into the octahedral structural framework, and/or ii) incorporation of Ga 3+ species on the catalyst surface thus modifying catalysts acid properties.

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Section: Catalyst Characterizationsupporting

confidence: 76%

Preparation, characterization and catalytic behavior for propane partial oxidation of Ga-promoted MoVTeO catalysts

Hernández-Morejudo

Massó

García-González

et al. 2015

Applied Catalysis A: General

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“…No significant differences in the BET surface area of the heat-treated samples. On the other hand, the composition of the Spray-dried sample is similar to The results indicate that spray-drying not only led to the inhibition of selective crystallization with uniform composition, but also to the similar distribution of metal ions in the Spray-dried sample and the starting gel 9 . Additionally, the compositional segregation in the precipitate occurred after centrifuge due to the formation of two or more metal oxide phases.…”

Section: Resultssupporting

confidence: 48%

“…In addition, peaks at 2θ = 22. 9 . Table 1 summarizes some of the main characteristics of MoVTeNb oxide catalysts.…”

Section: Resultsmentioning

confidence: 99%

Effect of Drying on the Synthesis and Characterizationc MoVTeNbOx Mixed Metal Oxide Catalysts Prepared by Reflux

Ramli¹,

Hitam²,

Ahangar³

et al. 2013

Orientjchem.

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“…Method 2: Single-phase M1 was prepared by using a modified procedure adapted from Ushikubo et al, [7] which was followed by a washing route described by Baca et al [31] First, (NH 4 ) 6 37.441 g) in MQ water (0.5 L) at 313 K. This solution was then added to the Mo/V/Te-containing solution, and the solution volume was adjusted to 2.5 L by using MQ water. After stirring for 30 min at 313 K, the resultant slurry with a nominal molar ratio Mo/V/Te/Nb of 1:0.3:0.23:0.125 was spray-dried by using a Büchi B-191 mini spray-dryer.…”

Section: Synthesismentioning

confidence: 99%

“…[10,[20][21][22][23][24][25] However, restricted applicability and resolution of spectroscopic and crystallographic methods strongly limit the knowledge regarding the molecular structure and electronic details of the M1 surface termination. [36,37] At the state of the art, it is still a nontrivial experimental task to synthesize phase-pure M1 catalysts in a controlled manner. [26] Because of the broad parameter space that determines the catalytic response of M1, development of controlled synthesis methods to produce well-defined, phase-pure materials is strongly required.…”

mentioning

confidence: 99%

Synthesis of MoVTeNb Oxide Catalysts with Tunable Particle Dimensions

et al. 2011

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IntroductionDuring the last three decades, complex multimetal oxides have captured the interest of researchers as potential catalysts for alkane activation. [1][2][3][4][5] In the oxidative dehydrogenation of ethane [5] and the selective oxidation of propane to acrylic acid, [6] selectivities of approximately 80 % have been achieved at high alkane conversion over mixed oxides based on Mo, V, Te, and Nb. The active catalysts are typically composed of the two different bronze-like compounds Mo 7.8 V 1.2 Te 0.937 NbO 28.9 and Mo 4.31 V 1.36 Te 1.81 Nb 0.33 O 19.81 , which are referred to in the literature as the M1 and M2 phases, respectively. [7][8][9][10][11][12][13] The activation of the CÀH bonds in the alkane molecule has been attributed primarily to the M1 phase. [6,[14][15][16][17][18] A synergistic effect of M2 in M1-M2 phase mixtures has also been discussed. [19] High crystallinity of the catalyst is required to achieve the utmost catalytic performance, implying the hypothesis that the development of active ensembles on the surface of M1 is governed by well-defined structural features. Accordingly, the catalytic relevance of the crystallographic (001) planes (basal planes of elongated M1 particles) has been intensively discussed in the literature. [10,[20][21][22][23][24][25] However, restricted applicability and resolution of spectroscopic and crystallographic methods strongly limit the knowledge regarding the molecular structure and electronic details of the M1 surface termination. The situation is further complicated by the facts that the M1 phase is only accessible in a certain compositional range and that the surface composition of the active catalyst is extremely sensitive towards operation conditions. [26] Because of the broad parameter space that determines the catalytic response of M1, development of controlled synthesis methods to produce well-defined, phase-pure materials is strongly required. This is important for gaining a deeper insight into the catalytic versatility of M1, which would provide a unique guide to design and discover new catalysts for selective oxidation.In general, MoVTeNb oxide catalysts are prepared by coprecipitation with subsequent rapid evaporation of the solvent [3,27] or by hydrothermal synthesis. [6,16,[28][29][30][31][32][33][34][35] Subsequent annealing in an inert atmosphere is necessary to crystallize the solids and to derive balanced oxidation states of the key elements. [36,37] At the state of the art, it is still a nontrivial experimental task to synthesize phase-pure M1 catalysts in a controlled manner. Particularly, it is difficult to avoid an intrinsic formation of the byproducts, such as the M2 phase, Te, (Mo 0.93 V 0.

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The investigation of chemical and phase composition of solid precursor of MoVTeNb oxide catalyst and its transformation during the thermal treatment

Cited by 36 publications

References 29 publications

Preparation, characterization and catalytic behavior for propane partial oxidation of Ga-promoted MoVTeO catalysts

Preparation, characterization and catalytic behavior for propane partial oxidation of Ga-promoted MoVTeO catalysts

Effect of Drying on the Synthesis and Characterizationc MoVTeNbOx Mixed Metal Oxide Catalysts Prepared by Reflux

Synthesis of MoVTeNb Oxide Catalysts with Tunable Particle Dimensions

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