Coke combustion kinetics of spent Pt-Sn/Al2O3 catalysts in propane dehydrogenation

Jacobalis, Samsi; Jung, Jin Chul; Oh, Ki Keun; Koh, HyeJung

doi:10.1007/s11814-020-0536-z

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…It can obtain a reliable E a without involving kinetic mode functions, can verify the results of the Coats–Redfern method, and can verify the consistency of the reaction mechanism throughout the process. Therefore, the Flynn–Wall–Ozawa (FWO) and Vyazovkin integral methods [ 29 , 30 ] were used for calculation, and their kinetic equations are shown in Equations (6) and (7), respectively.

…”

Section: Resultsmentioning

confidence: 99%

Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Qin

Ling

et al. 2022

Materials

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The combustion characteristics and kinetics of high- and low-reactivity metallurgical cokes in an air atmosphere were studied by thermogravimetric instrument. The Coats–Redfern, FWO, and Vyazovkin integral methods were used to analyze the kinetics of the cokes, and the kinetic parameters of high- and low-reactivity metallurgical cokes were compared. The results show that the heating rate affected the comprehensive combustion index and combustion reaction temperature range of the cokes. The ignition temperature, burnout temperature, combustion characteristics, and maximum weight-loss rate of low-reactivity coke (L-Coke) were better than high-reactivity coke (H-Coke). Low-reactivity coke had better thermal stability and combustion characteristics. At the same time, it was calculated via three kinetic analysis methods that the combustion activation energy gradually decreased with the progress of the reaction. The coke combustion activation energy calculated by the Coats–Redfern method was larger than the coke combustion activation energy calculated by the FWO and Vyazovkin methods, but the laws were consistent. The activation energy of L-Coke was about 4~8 kJ/mol more than that of H-Coke.

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…”

Section: Resultsmentioning

confidence: 99%

Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Qin

Ling

et al. 2022

Materials

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“…Figure 5 plots the TGA and differential thermogravimetric (DTG) curves of the 10V-XCe/Al samples (X = 0, 1, 3, 5, 7) as the temperature was increased from 50 °C to 800 °C in inert nitrogen gas. The DTG curves (Figure 5b) present a weight-loss peak at 90-120 °C, which probably represents the evaporation of physical water molecules from the sample surfaces [21]. The oxygen carrier with the highest cerium content (7 Ce) shows the least weight loss (Figure 5).…”

Section: Thermal Stabilities Of the Oxygen Carriersmentioning

confidence: 99%

Effect of Ce Content on the Chemical Looping Oxidative Dehydrogenation of Propane to Propylene over a VOx-CeO2/γ-Al2O3 Oxygen Carrier

et al. 2023

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The chemical looping oxidative dehydrogenation of propane to propylene (CL-ODHP) replaces molecular oxygen with lattice oxygen (Olatt) in oxygen carriers. This method boosts propylene selectivity by avoiding the deep oxidation of propane. Herein, a series of 10V-XCe/Al oxygen carriers with different Ce contents were prepared to realize different VOx-CeOy interactions. The effect of the Ce content in 10V-XCe/Al oxygen carriers on the CL-ODHP reaction was studied and the optimal Ce content was determined. CeO2 prevents the outward diffusion and evolution of Olatt in VOx carriers to the adsorbed electrophilic oxygen species (Oelec), effectively inhibiting the loss of Olatt, improving the selectivity of propylene, and extending the lifetime and activity of the oxygen carriers. After characterizing and analyzing the oxygen carriers, it was found that 10V-3Ce/Al has the highest specific surface area, highest oxygen capacity, and lowest reducibility. The 10V-3Ce/Al also delivers the highest oxidative dehydrogenation performance. At 550 °C, the average propylene and COx selectivity values of 10V-3Ce/Al were 81.87% and 7.28%, respectively (vs. 62.79% and 25.64% respectively, for 10V/Al). It is demonstrated that 10V-3Ce/Al exhibits good cycle stability with no significant decrease in catalytic performance after 15 cycles. In situ diffuse-reflectance infrared Fourier-transform spectroscopy indicates that CL-ODHP on 10V-3Ce/Al undergoes the Mars-van Krevelen mechanism. The migration and evolution of Olatt in oxygen carriers is controlled by reasonably modifying the metal oxide interactions to improve propylene yield. This work will thus guide the subsequent development of novel and efficient CL-ODHP oxygen carriers.

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“…Thermal gravimetric analysis has been used to study the non-isothermal kinetics of coke combustion, generated from the PDH process in presence of Pt-Sn/Al 2 O 3 catalysts [97]. Four different catalysts were prepared by varying the Pt/Sn ratio from 3/0.5 to 3/3 by weight, the catalytic activity was evaluated with a reactant mixture of C 3 H 8 (30 mL/min) and H 2 (30 mL/min) at 893 K for 5 h and the kinetic parameters for coke combustion were calculated by evaluating the coke deposited through a thermogravimetric analyzer in the presence of air.…”

Section: Catalyst Regeneration and Coke Combustion Kineticsmentioning

confidence: 99%

Propylene Synthesis: Recent Advances in the Use of Pt-Based Catalysts for Propane Dehydrogenation Reaction

et al. 2021

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Propylene is one of the most important feedstocks in the chemical industry, as it is used in the production of widely diffused materials such as polypropylene. Conventionally, propylene is obtained by cracking petroleum-derived naphtha and is a by-product of ethylene production. To ensure adequate propylene production, an alternative is needed, and propane dehydrogenation is considered the most interesting process. In literature, the catalysts that have shown the best performance in the dehydrogenation reaction are Cr-based and Pt-based. Chromium has the non-negligible disadvantage of toxicity; on the other hand, platinum shows several advantages, such as a higher reaction rate and stability. This review article summarizes the latest published results on the use of platinum-based catalysts for the propane dehydrogenation reaction. The manuscript is based on relevant articles from the past three years and mainly focuses on how both promoters and supports may affect the catalytic activity. The published results clearly show the crucial importance of the choice of the support, as not only the use of promoters but also the use of supports with tuned acid/base properties and particular shape can suppress the formation of coke and prevent the deep dehydrogenation of propylene.

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Coke combustion kinetics of spent Pt-Sn/Al2O3 catalysts in propane dehydrogenation

Cited by 4 publications

References 28 publications

Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study

Effect of Ce Content on the Chemical Looping Oxidative Dehydrogenation of Propane to Propylene over a VOx-CeO2/γ-Al2O3 Oxygen Carrier

Propylene Synthesis: Recent Advances in the Use of Pt-Based Catalysts for Propane Dehydrogenation Reaction

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