View in EDS

ThermalReduction of Ceria within an Aerosol Reactorfor H2O and CO2Splitting.

Saved in:
Bibliographic Details
Title: ThermalReduction of Ceria within an Aerosol Reactorfor H2O and CO2Splitting.
Authors: Scheffe, Jonathan R.1, Welte, Michael1, Steinfeld, Aldo1
Source: Industrial & Engineering Chemistry Research. Feb2014, Vol. 53 Issue 6, p2175-2182. 8p.
Subjects: Cerium oxides, Thermal stability, Chemical reduction, Chemical reactors, Carbon dioxide, Thermochemistry, Thermodynamics
Abstract: An aerosol reactorwas tested for the thermal reduction of ceriaas part of a solar thermochemical redox cycle for producing H2and CO from H2O and CO2. The designis based on the downward aerosol flow of ceria particles, counterto an argon sweep gas, which are rapidly heated and thermally reducedwithin residence times of less than 1 s. When operating in the temperaturerange of 1723–1873 K and at oxygen partial pressures between5 × 10–5and 1.2 × 10–4atm, reduction extents of small particles (Dv50= 12 μm) approached those predicted by thermodynamics.However, heat- and mass-transfer effects were found to limit theirconversion when the ceria mass flow rate was increased above 100 mgs–1. This reactor concept inherently results inseparation of the reduced ceria and evolved O2(g), operatesisothermally throughout the day, and decouples the reduction and oxidationsteps in both space and time for potential 24-h syngas generation. [ABSTRACT FROM AUTHOR]
Copyright of Industrial & Engineering Chemistry Research is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:An aerosol reactorwas tested for the thermal reduction of ceriaas part of a solar thermochemical redox cycle for producing H2and CO from H2O and CO2. The designis based on the downward aerosol flow of ceria particles, counterto an argon sweep gas, which are rapidly heated and thermally reducedwithin residence times of less than 1 s. When operating in the temperaturerange of 1723–1873 K and at oxygen partial pressures between5 × 10–5and 1.2 × 10–4atm, reduction extents of small particles (Dv50= 12 μm) approached those predicted by thermodynamics.However, heat- and mass-transfer effects were found to limit theirconversion when the ceria mass flow rate was increased above 100 mgs–1. This reactor concept inherently results inseparation of the reduced ceria and evolved O2(g), operatesisothermally throughout the day, and decouples the reduction and oxidationsteps in both space and time for potential 24-h syngas generation. [ABSTRACT FROM AUTHOR]
ISSN:08885885
DOI:10.1021/ie402620k