Dynamic CO oxidation over Pt/Al2O3

RACINE, B; Sally, Mark J.; Wade, Bruce; Herz, Richard K.

doi:10.1016/0021-9517(91)90228-v

Cited by 17 publications

(6 citation statements)

References 60 publications

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“…Additional experiments were performed with an inert support material. Pt-Re/C catalyst was first contacted with CO at 300 8C and then heated to 400 8C in a flow of He, in order to desorb CO completely from both Pt [31,32] as well as Re (separate in situ IR measurements showed that CO desorption on Pt-Re/TiO 2 was complete at 390 8C). After this, pulsing H 2 O resulted in formation of H 2 exclusively (Fig.…”

Section: Transient Pulse Experiments Over Pt/c and Pt-re/c Catalytic ...mentioning

confidence: 99%

Role of Re in Pt–Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study

Azzam

Babich

Seshan

et al. 2008

Applied Catalysis B: Environmental

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Section: Transient Pulse Experiments Over Pt/c and Pt-re/c Catalytic ...mentioning

confidence: 99%

Role of Re in Pt–Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study

Azzam

Babich

Seshan

et al. 2008

Applied Catalysis B: Environmental

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“…The rate enhancement can be explained in terms of storage by the surface of adsorbed reactants in one-half of a cycle and desorption and reaction of the stored reactants in the other half of the cycle, with CO and O 2 being stored in successive halves of the cycle. 6,27 The magnitude and location of the mean rate vs frequency curve for a porous catalyst will vary with many factors, including layer thickness, active site concentration, and shape of the composition forcing function.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Scaling Parameters for Dynamic Diffusion-Reaction over Porous Catalysts

Herz

2015

Ind. Eng. Chem. Res.

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The e↵ect of di↵usion resistance in porous solid catalysts on reaction rate during periodic cycling of CO concentration is shown for CO oxidation over Pt/Al 2 O 3 by numerical simulation. At some cycling frequencies, the average reaction rate during cycling is higher than the steady-state rate at the mean CO concentration, as expected for this nonlinear, reactant-inhibited reaction. In order to identify major aspects of dynamic di↵usion-reaction behavior, a simple kinetic mechanism that shows the main features of CO oxidation and other reactions with significant inhibition by reactants is investigated. A single dimensionless parameter group, the dynamic di↵usion coe cient, is added when going from steady-state to unsteady-state di↵usion-reaction equations. In the dynamic di↵usion coe cient, the rate at which gas-phase reactant di↵uses is reduced by the surface adsorption capacity of the catalyst. The frequency at which the peak average rate occurs is controlled by the dynamic di↵usion coe cient.

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“…The kinetics of CO combustion in the presence of platinum as catalysts has been discussed considerably in some articles. − However, most of these studies focus mainly on the reaction mechanisms under relatively low temperature and pressure conditions as compared to the conditions in the regenerator. Thus, these kinetic models cannot be directly incorporated into the modeling of the heterogeneous CO combustion in the regenerator.…”

Section: Introductionmentioning

confidence: 99%

Economic and Control Performance of a Fluid Catalytic Cracking Unit: Interactions between Combustion Air and CO Promoters

Wang

Luo

2013

Ind. Eng. Chem. Res.

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The presence of CO combustion promoters significantly affects the heterogeneous CO combustion in the regenerator of a fluid catalytic cracking (FCC) unit. Neglecting the quantitative correlation between the heterogeneous CO combustion and the amount of added CO combustion promoters in the previous models makes it impossible to predict the steady-state and the dynamic behaviors of the system with respect to the CO combustion promoters. Therefore, an augmented dynamic model of an FCC unit with high-efficiency regenerator incorporating the quantitative correlation between heterogeneous CO combustion and the CO combustion promoters is developed, and the corresponding closed-loop dynamic responses are obtained. Since CO combustion in the regenerator is affected by both the combustion air flow rate and the CO combustion promoters, a sensitivity analysis of some important variables related to the combustion air flow rate and the amount of added CO combustion promoters is carried out and the overall operating map of the system is developed by selecting the conversion of the riser, the integrated absolute errors of the controllers, and the temperature rise between the dense bed and the outlet of the freeboard to represent the concerns of economics, control, and safety.

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Dynamic CO oxidation over Pt/Al2O3

Cited by 17 publications

References 60 publications

Role of Re in Pt–Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study

Role of Re in Pt–Re/TiO2 catalyst for water gas shift reaction: A mechanistic and kinetic study

Scaling Parameters for Dynamic Diffusion-Reaction over Porous Catalysts

Economic and Control Performance of a Fluid Catalytic Cracking Unit: Interactions between Combustion Air and CO Promoters

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