The oxidation of propene over bismuth oxide, molybdenum oxide, and bismuth molybdate catalysts

Peacock, J. M.; Sharp, Marjorie J.; Parker, A. J.; Ashmore, P. G.; Hockey, J. A.

doi:10.1016/0021-9517(69)90307-8

Cited by 63 publications

(10 citation statements)

References 3 publications

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“…This type of evolution has been observed by other investigators in the case of Mo(VI) oxide supported on A120 326,28 and on Si02. 29,30 In studies performed by the XPS technique, on both type of supported catalysts, it was found that the amount of Mo(IV) increases and Mo(VI) diminishes with the time, suggesting that Mo(V) is an intermediate in the Mo(VI) reduction. In the case of A1203, the appearance of Mo(V) is attributed to a strong interaction with the support; bulk Mo03, during reduction, does not exhibit any Mo(V) signal.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical characterization of the interaction between cobalt molybdenum oxide and silicon dioxide. 1. Influence of the cobalt-molybdenum ratio

Gajardo¹,

Grange²,

Delmon³

1979

J. Phys. Chem.

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Physicochemical studies on a series of cobalt-molybdenum supported on silica catalysts containing the same amount of oxide phase with an atomic ratio r = Co/(Co + Mo) ranging from 0 to 1 and the phases obtained after reduction by hydrogen allow us a better understanding of the structure of these solids. X-ray diffraction, DRS, and XPS measurements of the oxide phase, the study of the reduction by hydrogen by use of gravimetric measurements, and ESR and DRS measurements carried out on the reduced phase show that weak interaction of the molybdenum with the silica (as compared with those on alumina) strongly modify the nature of the species presented on the support. It has been shown that cobalt and molybdenum almost stoichiometrically form C0M0O4 (a and b phases). Furthermore when Mo03 and Co304 are in excess they cover the CoMo04 crystals forming a geod structure. In conclusion, it is proposed that, when the interactions of the molybdenum with the support are weak, the CoMo "bilayer" precursor of the active sites is not easily formed. Consequently the strong interaction between cobalt and molybdenum leads to the formation of bulk CoMo04, compound which does not form, after activation, the active phase in HDS catalysts.

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Section: Resultsmentioning

confidence: 99%

Physicochemical characterization of the interaction between cobalt molybdenum oxide and silicon dioxide. 1. Influence of the cobalt-molybdenum ratio

Gajardo¹,

Grange²,

Delmon³

1979

J. Phys. Chem.

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“…Numerous examples can be given to illustrate the importance of the quantitative determination of the number of spins in interface studies (Table , E-11), e.g., the mechanism of propylene adsorption on MoO 3 was deduced from the changes of Mo(V) signal intensity as a function of temperature and pressure − Two different centers of reduced vanadium, stabilized by oxygen vacancies or by Mo(VI) ions, were identified. , …”

Section: Quantitative Approachmentioning

confidence: 99%

“…Numerous examples can be given to illustrate the importance of the quantitative determination of the number of spins in interface studies (Table 2, E-11), e.g., the mechanism of propylene adsorption on MoO 3 was deduced from the changes of Mo(V) signal intensity as a function of temperature and pressure. 53 The kinetic model of redox processes occurring in V 2 O 5 /MoO 3 catalysts upon interaction with oxygen and propylene was elaborated on the basis of quantitative EPR measurements. [54][55][56] Two different centers of reduced vanadium, stabilized by oxygen vacancies or by Mo(VI) ions, were identified.…”

Section: Quantitative Approachmentioning

confidence: 99%

EPR as a Tool To Investigate the Transition Metal Chemistry on Oxide Surfaces

1997

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“…Even though the mechanism of oxidation reactions on metal oxide catalysts is understood quite well, only a few kinetic models for the catalytic propylene oxidation are based on the MvK approach. 35−38 Many kinetic models consist of simple power law rate expressions with dependencies on the partial pressure of propylene, 2,4,13,20,39,40 oxygen, 2,4 or both. 41 Especially for the main reaction of propylene to acrolein, other studies suggest two power law rate expressions to describe the reduction step and reoxidation step separately from each other.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling of the Partial Oxidation of Propylene to Acrolein: A Systematic Procedure for Parameter Estimation Based on Non-isothermal Data

Ganzer

Freund

2019

Ind. Eng. Chem. Res.

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On the basis of non-isothermal experiments in an integral pilot-scale reactor, the heterogeneously catalyzed gas phase oxidation of propylene to acrolein was investigated at industrial relevant process conditions. From an extensive experimental data set both reaction scheme and reaction rates were derived. Beside the main components propylene, oxygen, acrolein, and water, the proposed reaction network includes a variety of side products. The reaction rates were modeled by a semi-mechanistical approach given by Mars and van Krevelen. On the basis of a two-dimensional, pseudohomogeneous reactor model, the kinetic parameters were estimated successfully by introducing a systematic procedure for a stepwise determination using different regions with different characteristics to estimate the pre-exponential factors and activation energies individually, i.e., separate from each other. The model is able to predict the data included in the parameter estimation and independent data measured at different process conditions as well. Furthermore, it provides reliable results for an industrial plant.

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The oxidation of propene over bismuth oxide, molybdenum oxide, and bismuth molybdate catalysts

Cited by 63 publications

References 3 publications

Physicochemical characterization of the interaction between cobalt molybdenum oxide and silicon dioxide. 1. Influence of the cobalt-molybdenum ratio

Physicochemical characterization of the interaction between cobalt molybdenum oxide and silicon dioxide. 1. Influence of the cobalt-molybdenum ratio

EPR as a Tool To Investigate the Transition Metal Chemistry on Oxide Surfaces

Kinetic Modeling of the Partial Oxidation of Propylene to Acrolein: A Systematic Procedure for Parameter Estimation Based on Non-isothermal Data

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