Theoretical analysis of hydrogen production by variable volume membrane batch reactors with direct liquid fuel injection

Yun, Thomas M.; Kottke, Peter A.; Anderson, David M.; Fedorov, Andrei G.

doi:10.1016/j.ijhydene.2015.04.051

Cited by 1 publication

(1 citation statement)

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“…The Maxwell-Stefan approach is adopted, as opposed to using a pseudobinary Fickian approach, because it is rigorous in treating multiple component mixtures and has been found to be more accurate especially in the limit of large disparity in molecular weights of the mixture components . In a previous study by Yun et al, the use of the Maxwell-Stefan formulation was critical in achieving quantitative agreement between simulation and experimental results in a sorption-free CHAMP reactor with methanol as fuel. According to Maxwell-Stefan formalism, the diffusive flux , where is a column vector representing the diffusive fluxes of N s – 1 species, and [ B ] is an ( N s – 1) × ( N S – 1) matrix with terms where x l is the mole fraction of species l , and is the pairwise binary diffusion coefficient of species l in species m .…”

Section: Reactor Modelmentioning

confidence: 99%

Comprehensive Analysis of Sorption Enhanced Steam Methane Reforming in a Variable Volume Membrane Reactor

Anderson

Yun

Kottke

et al. 2017

Ind. Eng. Chem. Res.

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The use of combined reaction-separation processes in steam methane reforming (SMR) has recently received significant attention as an enticing route to meet the challenging requirements of distributed hydrogen production for fuel cell vehicles. While many of the investigations in recent literature focus solely on either CO 2 adsorption or selective H 2 membrane permeation to reduce the reactor footprint and the temperature required to drive the endothermic reaction in continuous flow reactors, the CHAMP-SORB is a new variable volume, transient batch reactor technology that utilizes both strategies simultaneously. Building upon our prior study in which we experimentally demonstrated the viability of CHAMP-SORB reactor concept on bench scale, this work focuses on understanding the heat/mass transfer and reaction/separation interactions to develop guidelines for the reactor scale-up. A combined transport-kinetic model is developed, including spatial variations of SMR reaction and CO 2 adsorption rates within the mixed catalyst/sorbent bed along with hydrogen removal via membrane separation. Insights gained by application of the model are used to improve the large scale reactor performance by concentrating the catalyst near the H 2 permeable membrane, as compared to the baseline reactor configuration with spatially uniform catalyst/ sorbent. Additionally, the modeling methodology and an approach to numerical solution of governing equations are comprehensive, including Maxwell-Stefan formalism for treating multicomponent species transport, and are generally applicable to any reactors with homogeneous and heterogeneous chemical reactions, membrane separation, and time-dependent volume change for a wide variety of chemical processes.

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