Determination of Mechanism in Heterogeneous Catalysis

Burwell, Robert L.

doi:10.1007/978-3-642-75956-7_1

Cited by 3 publications

(2 citation statements)

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“…There have been several mechanisms presented in the literature that describe the role of various metal-based homogeneous and heterogeneous catalysts in CWO. [240][241][242] Some of the most-common mechanisms proposed include homolytic catalysis, coordination catalysis, redox catalysis (such as Mars-Van Krevelen), 94 or adsorption models (such as Eley-Rideal (EL) and Langmuir-Hinshelwood-Hougen-Watson (LHHW)).…”

Section: Catalytic Wet Oxidation Reaction Mechanismssmentioning

confidence: 99%

Wet Oxidation and Catalytic Wet Oxidation

Bhargava

Tardio

Prasad

et al. 2006

Ind. Eng. Chem. Res.

436

334

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This review article explores three major aspects of the wet oxidation (WO) and catalytic wet oxidation (CWO) processes (with the major focus being on WO and CWO, using air or oxygen as an oxidant). These aspects are (a) the fundamental chemistry of WO/CWO; (b) important aspects of catalysts, with regard to the CWO process; and (c) engineering aspects of the WO/CWO process. The applications of WO and CWO technology to treat industrial wastewater clearly illustrate the potential of these processes for treating wastewater from a wide number of industries. WO/CWO is a fertile area of research with significant scope for further research and innovation, particularly in the areas of catalyst development, the understanding of catalytic mechanisms, and the fundamental chemistry that occurs during WO/CWO. Selected examples of findings to date are discussed in this review.

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Section: Catalytic Wet Oxidation Reaction Mechanismssmentioning

confidence: 99%

Wet Oxidation and Catalytic Wet Oxidation

Bhargava

Tardio

Prasad

et al. 2006

Ind. Eng. Chem. Res.

436

334

View full text Add to dashboard Cite

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“…It is commonly believed that the relationship between kinetic data and mechanism model is unidirectional, in the sense that a mechanism can be used to derive a rate expression, but kinetic data alone cannot be used to establish a mechanism. Usually more than one model can give a reasonably good fit to kinetic data.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Ozone Decomposition on a Manganese Oxide Catalyst. 2. Steady-State and Transient Kinetic Studies

1998

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This paper presents an in-depth study of the mechanism of ozone decomposition on a manganese oxide catalyst as studied by in situ Raman spectroscopy and kinetic measurements. In the companion paper, the reaction intermediate was identified to be a peroxide species by using isotopic substitution and ab initio calculations. To ascertain the role of the intermediate in the catalytic reaction, we investigated its steady-state and transient kinetics, as well as the steady-state kinetics of the overall decomposition reaction, at temperatures from 281 to 340 K and ozone partial pressures from 4.7 Pa to 2.1 kPa. The steady-state and transient kinetics were found to be well-represented by a two-step sequence consisting of (i) adsorption of ozone to form the peroxide species, and (ii) desorption of molecular oxygen. The surface was found to be nonuniform, with activation energies that varied linearly with amount of surface coverage. At zero surface coverage the activation energy for ozone adsorption was 6.2 kJ mol -1 ; that for molecular oxygen desorption was 69.0 kJ mol -1 . The steady-state surface coverages derived from the transient results are in excellent agreement with those measured at steady-state conditions, and the transient desorption kinetics are well-described by the kinetic parameters obtained from the steady-state data, indicating that the proposed reaction sequence accurately describes the mechanism of decomposition.

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