The effects of morphology on the thermal reduction of nonstoichiometric ceria

Daniel J. Keene; Wojciech Lipiński; Jane H. Davidson

doi:10.1016/j.ces.2014.01.010

The effects of morphology on the thermal reduction of nonstoichiometric ceria

Daniel J. Keene, Wojciech Lipiński^*, Jane H. Davidson

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

A numerical heat and mass transfer model is used to study the effects of the morphological features of a porous medium composed of ceria when it is placed in a cavity and exposed to high-flux solar irradiation to drive a nonstoichiometric reduction. The morphological features are described by the porosity and pore-level Sauter mean diameter. For porosities of 0.60, 0.75, and 0.90, the rate of oxygen production and the efficiency of solar-to-chemical energy conversion increase monotonically as the Sauter mean diameter is decreased from 1000 to 30. μm. For a porosity of 0.90, these performance metrics continue to increase down to 10. μm. The primary effect of the changes in porosity and Sauter mean diameter are through their influence on the permeability and the extinction coefficient of the medium. For appropriately selected time duration, an energy conversion efficiency of 10.9% is achieved with a Sauter mean diameter of 10. μm and a porosity of 0.90.

Original language	English
Pages (from-to)	231-243
Number of pages	13
Journal	Chemical Engineering Science
Volume	111
DOIs	https://doi.org/10.1016/j.ces.2014.01.010
Publication status	Published - 24 May 2014

Access to Document

10.1016/j.ces.2014.01.010

Cite this

@article{9dff261d2be143548657e14b489f1e0a,

title = "The effects of morphology on the thermal reduction of nonstoichiometric ceria",

abstract = "A numerical heat and mass transfer model is used to study the effects of the morphological features of a porous medium composed of ceria when it is placed in a cavity and exposed to high-flux solar irradiation to drive a nonstoichiometric reduction. The morphological features are described by the porosity and pore-level Sauter mean diameter. For porosities of 0.60, 0.75, and 0.90, the rate of oxygen production and the efficiency of solar-to-chemical energy conversion increase monotonically as the Sauter mean diameter is decreased from 1000 to 30. μm. For a porosity of 0.90, these performance metrics continue to increase down to 10. μm. The primary effect of the changes in porosity and Sauter mean diameter are through their influence on the permeability and the extinction coefficient of the medium. For appropriately selected time duration, an energy conversion efficiency of 10.9% is achieved with a Sauter mean diameter of 10. μm and a porosity of 0.90.",

keywords = "Ceria, Concentrating solar, Porous, Redox cycle, Synthetic fuel, Thermochemistry",

author = "Keene, {Daniel J.} and Wojciech Lipi{\'n}ski and Davidson, {Jane H.}",

year = "2014",

month = may,

day = "24",

doi = "10.1016/j.ces.2014.01.010",

language = "English",

volume = "111",

pages = "231--243",

journal = "Chemical Engineering Science",

issn = "0009-2509",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - The effects of morphology on the thermal reduction of nonstoichiometric ceria

AU - Keene, Daniel J.

AU - Lipiński, Wojciech

AU - Davidson, Jane H.

PY - 2014/5/24

Y1 - 2014/5/24

N2 - A numerical heat and mass transfer model is used to study the effects of the morphological features of a porous medium composed of ceria when it is placed in a cavity and exposed to high-flux solar irradiation to drive a nonstoichiometric reduction. The morphological features are described by the porosity and pore-level Sauter mean diameter. For porosities of 0.60, 0.75, and 0.90, the rate of oxygen production and the efficiency of solar-to-chemical energy conversion increase monotonically as the Sauter mean diameter is decreased from 1000 to 30. μm. For a porosity of 0.90, these performance metrics continue to increase down to 10. μm. The primary effect of the changes in porosity and Sauter mean diameter are through their influence on the permeability and the extinction coefficient of the medium. For appropriately selected time duration, an energy conversion efficiency of 10.9% is achieved with a Sauter mean diameter of 10. μm and a porosity of 0.90.

AB - A numerical heat and mass transfer model is used to study the effects of the morphological features of a porous medium composed of ceria when it is placed in a cavity and exposed to high-flux solar irradiation to drive a nonstoichiometric reduction. The morphological features are described by the porosity and pore-level Sauter mean diameter. For porosities of 0.60, 0.75, and 0.90, the rate of oxygen production and the efficiency of solar-to-chemical energy conversion increase monotonically as the Sauter mean diameter is decreased from 1000 to 30. μm. For a porosity of 0.90, these performance metrics continue to increase down to 10. μm. The primary effect of the changes in porosity and Sauter mean diameter are through their influence on the permeability and the extinction coefficient of the medium. For appropriately selected time duration, an energy conversion efficiency of 10.9% is achieved with a Sauter mean diameter of 10. μm and a porosity of 0.90.

KW - Ceria

KW - Concentrating solar

KW - Porous

KW - Redox cycle

KW - Synthetic fuel

KW - Thermochemistry

UR - http://www.scopus.com/inward/record.url?scp=84896521930&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2014.01.010

DO - 10.1016/j.ces.2014.01.010

M3 - Article

SN - 0009-2509

VL - 111

SP - 231

EP - 243

JO - Chemical Engineering Science

JF - Chemical Engineering Science

ER -

The effects of morphology on the thermal reduction of nonstoichiometric ceria

Abstract

Access to Document

Other files and links

Fingerprint

Cite this