Effect of coke deposition over microporous and hierarchical ZSM-23 zeolite

Silva, Bruno J. B.; Sousa, Lenivaldo V.; Sarmento, Lais R.A.; Melo, Ana C. S.; Silva, Deidiane S.; Quintela, Paulo Henrique Leite; Alencar, Soraya Lira; Silva, Antônio Osimar Sousa da

doi:10.1007/s10973-021-10740-3

Cited by 5 publications

(2 citation statements)

References 50 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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“…Therefore, the mesopores generated in the Z22-HS40-Des sample allowed an increase in molecular diffusion, and with this, the micropores were more slowly blocked due to the greater accessibility to the interior of the zeolite structure (Silva, et al, 2022). The products distribution obtained in the n-heptane catalytic cracking is listed in Table 3.…”

Section: Catalytic Performancementioning

confidence: 99%

Different approaches to the synthesis of ZSM-22 zeolite with application in n-heptane cracking

Júnior

Ribeiro

Silva

et al. 2022

RSD

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The synthesis of ZSM-22 zeolite has been extensively studied due to its properties of form selectivity, acidity and hydrothermal stability, which is applied in important reactions in the areas of petroleum refining and petrochemicals. In view of this, the present work studied different approaches of synthesis of ZSM-22 using: 1-diaminohexane as a structure directing agent, (ii) methanol and seed crystals, (iii) aging of the synthesis gel with addition of polymer, surfactant and silane and (iv) starch, calcium carbonate and silanized silica with subsequent desilication. Thus, the effects of these methodologies on the textural properties, acidity and catalytic activity of the zeolites obtained were evaluated. The samples were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption, scanning electron microscopy (SEM), ammonia desorption at programmed temperature (NH3-TPD) and thermal analysis (TG/DTG). The catalytic activity and selectivity of the catalysts were evaluated in the model catalytic cracking reaction of n-heptane at 650 °C for 180 min. The synthesis route using methanol and seed crystals allowed obtaining ZSM-22 in 3 h of crystallization, drastically reducing the synthesis time compared to other methodologies. Despite this, the use of 1-diaminohexane led to the obtaining of zeolite with textural properties, acidity and catalytic activity superior to the other samples. The generation of mesoporosity was obtained through the use of silanized silica and subsequent desilication, leading to greater catalytic stability and less deactivation by coke. All catalysts showed similar selectivity to the formation of compounds in the range C2 to C4.

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Kinetic study of coke decomposition formed on modified Beta zeolite with zinc and lanthanum

Silva

Almeida

Santos

et al. 2023

Braz. J. Chem. Eng.

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Effect of coke deposition over microporous and hierarchical ZSM-23 zeolite

Cited by 5 publications

References 50 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

Different approaches to the synthesis of ZSM-22 zeolite with application in n-heptane cracking

Kinetic study of coke decomposition formed on modified Beta zeolite with zinc and lanthanum

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