Transport Mechanism and Modeling of Microporous Zeolite Membranes

Vaezi, Mohammad Javad; Kojabad, Mahdi Elyasi; Beiragh, Masoud Majidi; Babaluo, Ali Akbar

doi:10.1016/b978-0-12-816350-4.00008-8

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…In contrast, when the configurational diffusion is significant, experimental techniques or molecular simulations are required to determine the effectivity diffusion . Xiao and Wei proposed two theoretical models, the solid vibration (SV) model and the gas translation (GT) model, which require complex data to obtain such activation energies …”

Section: Resultsmentioning

confidence: 99%

Calculation of Mass Transfer Limitations for a Gas-Phase Reaction in an Isothermal Fixed Bed Reactor: Tutorial and Sensitivity Analysis

et al. 2023

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The study of the reactivity of catalysts requires one to assess chemical kinetics and mechanisms in the absence of mass transport artifacts. Despite the existence of models and criteria for assessing the presence of mass transfer limitations during catalytic tests for gas-phase reactions in isothermal fixed bed reactors, the literature does not present straightforward protocols for performing the latter calculations. In this work, we present a systematic protocol for the calculations above. Particularly, we present protocols for estimating the effectiveness factor for external and the Weisz-Prater number for the internal mass transfer limitations. Data previously published on the oxidation of propane over mixed vanadium–aluminum (hydr)oxides was taken as a case study. Based on these protocols, we did a sensitivity study of the models used for calculations. Results showed that the model for calculating the effectiveness factor was poorly sensitive to all the above modifications. Meanwhile, the Weisz-Prater number was much more sensitive to the studied modifications, even reaching deviations up to ∼200%.

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Section: Resultsmentioning

confidence: 99%

Calculation of Mass Transfer Limitations for a Gas-Phase Reaction in an Isothermal Fixed Bed Reactor: Tutorial and Sensitivity Analysis

et al. 2023

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“…Left: transport mechanism of gas separation membrane. Reproduced with permission from Vaezi et al [220] . Right: principle of (a) gas separation membrane and (b) gas absorption membrane.…”

Section: Membrane Separation Processmentioning

confidence: 99%

Recent progress in carbon dioxide capture technologies: A review

Lu,

Wang,

Bhatti

et al. 2023

CEST

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The continuous increase in anthropogenic CO2 emissions is widely acknowledged as one of the main reasons for global climate change. To address this issue, significant advancements have been made in developing CO2 capture and utilization technologies that offer new solutions for mitigating carbon emissions and promoting a carbon economy. In this review, we summarize the recent research progress in CO2 capture and separation technologies, including pre-combustion, post-combustion, oxy-fuel combustion, chemical looping combustion and calcium looping combustion. Among these technologies, post-combustion is seen as one of the most promising options for reducing CO2 emissions from existing power plants, as it can be easily integrated into existing facilities without requiring major modifications. Therefore, the second section of this article focuses on the various post-combustion processes and technologies, such as physical absorption, amine scrubbing, dual-alkali absorption, chilled ammonia, membrane separation, and solid adsorption, with a particular emphasis on most recent research reports. As amine-based chemical absorption is the most leading post-combustion CO2 capture technique, the third section summarizes the recent development in amine-based absorption technology by covering conventional and emerging types of absorbents such as single amine, blended amine, biphasic amine, and non-aqueous amine processes. The different liquid absorption-based process is compared in terms of regeneration energy consumption, CO2 intake capacity, and optimal operating conditions, and the comparison data is summarized in tables. A critical literature review and comparison of various techniques show that non-aqueous amine absorbents can be promising alternatives to the conventional monoethanolamine (MEA) process. The goal of this review is to provide strategies and perspectives for accelerating the further study and development of CCS technologies.

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“…3 Xiao and Wei 37 proposed two theoretical models, the solid vibration (SV) model, and the gas translation (GT) model, which require data such as complex activation energies to obtain. 39 Finally, it is possible to obtain the value of the Weisz-Prater number using Equation 3. The procedure is exemplified in Replacement 34.…”

Section: Adjustable Parameters Systemmentioning

confidence: 99%

Calculation of mass transfer limitations of a gas-phase reaction in an isothermal fixed bed reactor: tutorial and sensitivity analysis

García-Sánchez

Valderrama-Zapata

Acevedo-Córdoba

et al. 2022

Preprint

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The study of the reactivity of solid catalysts requires assessing chemical kinetics and mechanism in the absence of mass transport artifacts. These artifacts consist of the formation of concentration gradients either on the external or internal (inside nanopores) surface of the solid. Despite the existence of models and criteria for assessing the presence of mass transfer limitations during catalytic tests for gas-phase reactions in isothermal fixed bed reactors, the literature does not present straightforward protocols for performing the latter calculations. In this work, we present a systematic and complete protocol for the calculations above. The developed protocol serves as a tutorial for students and researchers. Particularly, the effectiveness factor for external and the Weisz-Prater number for the internal mass transfer limitations were developed. The oxidation of propane over mixed vanadium-aluminum (hydr)oxides was taken as a case study. Based on these protocols we perform a sensitivity study of the models for the following modifications: (i) the equation of state for modeling the thermodynamic properties of the gas phase, (ii) the particle size, (iii) the conversion of propane at two different temperatures and, (iv) the reactant used as a basis of the calculations; i.e., switching from propane to oxygen. Results showed that the model for calculating the effectiveness factor was poorly sensitive to all the above modifications. Meanwhile, the Weisz-Prater number was much more sensitive to the studied modifications, even reaching deviations up to ~200%.

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Transport Mechanism and Modeling of Microporous Zeolite Membranes

Cited by 5 publications

References 15 publications

Calculation of Mass Transfer Limitations for a Gas-Phase Reaction in an Isothermal Fixed Bed Reactor: Tutorial and Sensitivity Analysis

Calculation of Mass Transfer Limitations for a Gas-Phase Reaction in an Isothermal Fixed Bed Reactor: Tutorial and Sensitivity Analysis

Recent progress in carbon dioxide capture technologies: A review

Calculation of mass transfer limitations of a gas-phase reaction in an isothermal fixed bed reactor: tutorial and sensitivity analysis

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