Study of Ga modified Cs2.5H1.5PV1Mo11O40 heteropolyoxometallates for propane selective oxidation

Dimitratos, Nikolaos; Védrine, J.C.

doi:10.1016/j.molcata.2006.03.075

Cited by 20 publications

(15 citation statements)

References 34 publications

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“…One of them is in the range of -3.60 to -3.54 ppm and the other is in the range of −4.44 to −4.35 ppm, representing two different phosphorous nucleus environments in the samples. The latter can be assigned to Cs4PMo11VO40 as has been reported in the literature [26], and the former is assigned to hydrated acidic ammonium salts of H3PMo12O40 or H4PMo11VO40. This confirms that the initial precipitates and the evaporation residues are mixtures of cesium and ammonium salts of heteropolyacids, which is in agreement with the XRD measurement.…”

Section: Structure Analysis Of the Initial Precipitates And The Evaposupporting

confidence: 57%

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

Zhang

Wang

et al. 2016

Catalysts

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Abstract:The composition, structural evolution and the related property variations of mixed cesium/ammonium acidic salts of heteropolyacids were investigated in detail by tracking and analyzing the initial precipitates, evaporation residues and the calcined products in their preparation process. Results show that V cannot completely enter the heteropolyanions in the initial precipitates when the Cs + added amount is low, and the increase in Cs + adding amount improves the substitution of V for Mo in the heteropolyanions. Both the initial precipitates and the evaporation residues are mixtures of cesium and ammonium salts of heteropolyacids before calcination. Thermal treatment causes the decomposition of the ammonium salts and the formation of single-phase solid solutions from mechanical mixtures. The calcined products of the initial precipitates and the evaporation residues vary greatly in textural properties. The determinants of the catalytic performance for the oxidation of methacrolein to methacrylic acid are acidity and specific surface area of the compounds. The increase in specific surface area mainly improves the conversion of methacrolein, but not the selectivity of methacrylic acid. Insufficient acidity caused by high Cs + content in the compounds is responsible for the low selectivity.

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Section: Structure Analysis Of the Initial Precipitates And The Evaposupporting

confidence: 57%

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

Zhang

Wang

et al. 2016

Catalysts

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“…The preparation of only one bi-cationic heteropoly salt containing both cesium and gallium cations Cs 2.5 Ga x H y PVMo 11 O 40 was described in the past [18]. In that study the appropriate amounts of Ga(NO 3 ) 3 and Cs 2 CO 3 were added to the aqueous solution of heteropolyacid H 4 PVMo 11-x W x O 40 .…”

Section: Introductionmentioning

confidence: 99%

Ethanol conversion over cesium-doped mono- and bi-cationic aluminum and gallium H3PW12O40 salts

Filek

Kirpsza

Micek‐Ilnicka

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…This is primarily due to the low cost of methane compared to other hydrocarbons [1]. Development of new efficient catalysts for the selective oxidation of light alkanes is still at the research and development stage [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Conversion of Methane Into Syngas and Ethylene

Talasbayeva¹,

Kazhdenbek²,

Zhang³

et al. 2019

OF THE ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHSTAN

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Study of Ga modified Cs2.5H1.5PV1Mo11O40 heteropolyoxometallates for propane selective oxidation

Cited by 20 publications

References 34 publications

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

Composition, Structural Evolution and the Related Property Variations in Preparation of Mixed Cesium/Ammonium Acidic Salts of Heteropolyacids

Ethanol conversion over cesium-doped mono- and bi-cationic aluminum and gallium H3PW12O40 salts

Catalytic Conversion of Methane Into Syngas and Ethylene

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