Kinetic modeling of the total oxidation of propane over CuO-CeO2/γ-Al2O3

Heynderickx, Philippe M.; Thybaut, Joris W.; Poelman, Hilde; Poelman, Dirk; Marin, Guy

doi:10.1016/j.apcatb.2009.11.018

Cited by 77 publications

(60 citation statements)

References 62 publications

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“…Adsorption entropy and enthalpy should meet the following list of 11 of 37 37 37 37 criteria in Eqs. (6) and (7) for catalytic reactions [42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

Novel mechanistic view of catalytic ozonation of gaseous toluene by dual-site kinetic modelling

Yao

Hui

et al. 2017

Chemical Engineering Journal

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe catalytic ozonation of VOCs is a promising approach for degradation of indoor VOCs, such as gaseous toluene. However, the mechanism and relevant kinetic steps involved in this reaction remain unclear. In this study, the catalytic ozonation of toluene over MnO 2 /graphene was investigated using the empirical power law model and classic Langmuir-Hinshelwood single-site (denoted as L-H s ) mechanism. The apparent activation energy determined using the power law model was 29.3±2.5 kJ mol −1 . This finding indicated that the catalytic ozonation of toluene over MnO 2 /graphene was a heterogeneous reaction, and the Langmuir-Hinshelwood mechanism was applicable. However, the L-H s mechanism did not fit the experimental data, suggesting that the reaction was non-single-site governed. A novel Langmuir-Hinshelwood dual-site (denoted as L-H d ) mechanism was then proposed to explain the experimental observations of the catalytic ozonation of toluene over MnO 2 /graphene through a steady-state kinetic study. This mechanism was based on the hypothesis that MnO 2 was responsible for ozone decomposition and toluene adsorption on graphene; these two types of adsorption were coupled by an adjacent attack. Furthermore, XPS results confirmed the presence of a strong connection between MnO 2 and graphene sites on the surface of MnO 2 /graphene. This connection allowed the adjacent attack and validated the dual-site mechanism. The L-H d model was consistent with the predicted reaction rate of toluene removal with a correlation coefficient near unity (r 2 = 0.9165). Moreover, the physical criterion was in accordance with both enthalpy and entropy of toluene adsorption constraints. Fulfillment of mathematical and physical criteria indicated the catalytic ozonation of toluene over MnO 2 /graphene can be well described by the L-H d mechanism. This study helps understand the catalytic ozonation of toluene over MnO 2 /graphene in a closely mechanistic view.

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“…Adsorption entropy and enthalpy should meet the following list of 11 of 37 37 37 37 criteria in Eqs. (6) and (7) for catalytic reactions [42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

Novel mechanistic view of catalytic ozonation of gaseous toluene by dual-site kinetic modelling

Yao

Hui

et al. 2017

Chemical Engineering Journal

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show abstract

“…Experimental data were scattered almost horizontally implying a slightly negative dependence on steam flow rate under the reaction conditions used. It is reported that total oxidation of propane is inhibited by the presence of steam over alumina supported catalysts [16,17]. A similar general agreement on the effect of steam in SR reactions is not present; although some studies on SMR over precious metal catalysts indicate an inhibiting effect by steam [18], others describe a non-monotonic dependence of reaction rate on steam partial pressure [19].…”

Section: Propane Autothermal Reformingmentioning

confidence: 77%

Power-law type rate equation for propane ATR over Pt–Ni/Al2O3 catalyst

Gökaliler

Önsan

Aksoylu

2012

International Journal of Hydrogen Energy

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“…For instance, the standard adsorption enthalpy of oxygen is reported from -19 to -98 kJ mol -1 [75] and the adsorption heat of water, measured on various metal oxides surfaces, ranges between -36 and -113 kJ mol -1 [76,77]. According to the estimated activation energies, the rate of formation of ethylene from ethane, vide Eq.…”

Section: Kineticsmentioning

confidence: 99%

“…The estimated values for the adsorption equilibrium constants for oxygen and water, vide [57,[75][76][77]. For instance, the standard adsorption enthalpy of oxygen is reported from -19 to -98 kJ mol -1 [75] and the adsorption heat of water, measured on various metal oxides surfaces, ranges between -36 and -113 kJ mol -1 [76,77].…”

Section: Kineticsmentioning

confidence: 99%