Selective oxidation of ethane over hydrothermally synthesized Mo–V–Al–Ti oxide catalyst

Chen, Ning Fang; Oshihara, Kenzo; Ueda, Wataru

doi:10.1016/s0920-5861(00)00516-2

Cited by 23 publications

(12 citation statements)

References 11 publications

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“…However their basicity is very different (Table 4). Multicomponent Mo-V for C 3 H 8 oxidation [29,30] are very acidic (e.g., Mo 6 V 2 O 22 , K = 0.549), and this acidity may be tempered by the presence of more basic cations like Te (K VI Te 6? = 1.173, K III Te 4?…”

Section: Correlations Between Optical Basicity and Theoretical Selectmentioning

confidence: 99%

“…= 0.60). For example, the material obtained by adding Al and Te to the raw formula Mo 6 V 2 O 22 [29,30] becomes less and less acidic along Mo 6 V 2 AlO 22.5 \ Mo 6 V 2 AlTe 0.5 O 23.5 \ Mo 6 V 2 AlTe 0.5 O 24 (Table 4). Mixed 'M1, M2' phases based on Mo,V,Nb with Te or Sb are known as good catalysts [31][32][33][34][35][36].…”

Section: Correlations Between Optical Basicity and Theoretical Selectmentioning

confidence: 99%

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Multicomponent Oxides in Selective Oxidation of Alkanes Theoretical Acidity versus Selectivity

Bordes‐Richard

2008

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Semi-empirical relationships between the 'optical basicity' K (so-called after Duffy) of solid oxides and the 'thermodynamic' selectivity in mild and total oxidation of hydrocarbons have recently been set up. They can be used to determine the optimum acidity of a solid catalyst or to account for its observed selectivity in a given reaction. The oxidic M x O z catalysts were ranked by means of the electron-donor power of oxygen which is represented by the optical basicity K. The difference of ionization potential I of molecules when the reactant becomes the product, which represents the variation of electron-donor power during the reaction, was used to rank reactions. Plotting DI against K for each 'reaction/selective catalyst' couple results in straight lines, the equation of which depends on the chemical nature of reactant (alkane and alkyl-aromatics, alkenes and aromatics, alcohols) and on the deepness of oxidation (ammoxidation, mild oxidation, total oxidation). The correlations are used to discuss the behaviour of V-and Mo-based, simple and multicomponent oxide catalysts, in the mild oxidation of C 2 and C 3 hydrocarbons.

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Section: Correlations Between Optical Basicity and Theoretical Selectmentioning

confidence: 99%

Section: Correlations Between Optical Basicity and Theoretical Selectmentioning

confidence: 99%

Multicomponent Oxides in Selective Oxidation of Alkanes Theoretical Acidity versus Selectivity

Bordes‐Richard

2008

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“…State-of-the-art catalysts for the partial oxidation of short alkanes are typically based on molybdenum and vanadium mixed oxides, which have been shown to preferentially form value-added products such as acrylic acid and acetic acid [9,[12][13][14][15][16][17][18][19][20]. Elements such as niobium and antimony have been added to these Mo-V-O structures with the objective of increasing their structural stability and maintaining the desired Mo-V phase [10].…”

Section: Introductionmentioning

confidence: 99%

Statistically Guided Synthesis of MoV-Based Mixed-Oxide Catalysts for Ethane Partial Oxidation

et al. 2018

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The catalytic performance of Mo 8 V 2 Nb 1 -based mixed-oxide catalysts for ethane partial oxidation is highly sensitive to the doping of elements with redox and acid functionality. Specifically, control over product distributions to ethylene and acetic acid can be afforded via the specific pairing of redox elements (Pd, Ni, Ti) and acid elements (K, Cs, Te) and the levels at which these elements are doped. The redox element, acid element, redox/acid ratio, and dopant/host ratio were investigated using a three-level, four-factor factorial screening design to establish relationships between catalyst composition, structure, and product distribution for ethane partial oxidation. Results show that the balance between redox and acid functionality and overall dopant level is important for maximizing the formation of each product while maintaining the structural integrity of the host metal oxide. Overall, ethylene yield was maximized for a Mo 8 V 2 Nb 1 Ni 0.0025 Te 0.5 composition, while acetic acid yield was maximized for a Mo 8 V 2 Nb 1 Ti 0.005 Te 1 catalyst.

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“…Grasselli et al have reported that the Mo-V-Nb-Te catalyst is comprised of at least two phases (M1 and M2) and that M1 is the paraffin-activating phase while M2 is the olefin conversion phase [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Our research group has developed a method of preparing pure orthorhombic phase of Mo-V-O oxides under hydrothermal conditions [27][28][29][30][31][32][33][34][35]. Although the complete understanding of the crystalline structure of Mo-V-O oxides has not been realized yet, it is classified that the unique pore and its neighbor area is necessary for the prominent catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have reported the selective oxidation of ethane to acetic acid and propane to acrylic acid by the doped Mo-V-O oxide catalysts (doped metal: Al, Cr, Fe, Te, Sb, and Nb) [28][29][30][31][32][33][34][35], and have discussed that the a layer-type material constructed mainly with six-or sevenmember rings is responsible for the high selectivity for the desired products. However, the catalytic applications using the Mo-V-O crystal were mainly focused on the selective oxidation of small molecules (carbon number is \5) at elevated temperature higher than 200°C.…”

Section: Introductionmentioning

confidence: 99%

Steric Effect on the Catalytic Performance of the Selective Oxidation of Alcohols Over Novel Crystalline Mo–V–O Oxide

Wang

Ueda

2008

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The Mo-V-O crystalline oxide with novel pore structure and consisting uniform six-and seven-member rings on the a-b plane is investigated for the selective oxidation of alcohols of different steric hindrance in liquid phase. The research target is to correlate catalytic activity with the pore structure of the crystal. Specially, substituted pyridines are employed as probe molecules to study poison effect which is closely related to the steric hindrance. As a result, the oxidation of benzyl alcohol, 1-hexanol and cyclohexanol produces aldehydes or ketones as main products. The oxidation of substrates with methyl groups on the carbon next to alcohol group mainly affords dehydrated products as olefins. The catalytic results with adding substituted pyridines in the oxidation of benzyl alcohol, 1-hexanol and 2-hexanol suggest that the active sites are located around the pore area, and are reachable by pyridine, not by substituted pyridines, such as 2-methylpyridine, 2-ethylpyridine and 2, 6-dimethylpyridine. Competitive adsorption on active sites between pyridine and benzyl alcohol remarkably decreases catalytic activity, which 2, 6-dimethylpyridine affects slightly. We have discussed that the adsorption-activation model of substrate is greatly dependent on its steric hindrance.

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Selective oxidation of ethane over hydrothermally synthesized Mo–V–Al–Ti oxide catalyst

Cited by 23 publications

References 11 publications

Multicomponent Oxides in Selective Oxidation of Alkanes Theoretical Acidity versus Selectivity

Multicomponent Oxides in Selective Oxidation of Alkanes Theoretical Acidity versus Selectivity

Statistically Guided Synthesis of MoV-Based Mixed-Oxide Catalysts for Ethane Partial Oxidation

Steric Effect on the Catalytic Performance of the Selective Oxidation of Alcohols Over Novel Crystalline Mo–V–O Oxide

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