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Mitigation methods for errors in oxygen measurement with redox cycling of materials for hydrogen and syngas production

Lapp, Justin and Rieping, Rene and Bulfin, Brendan and Roeb, Martin and Sattler, Christian (2018) Mitigation methods for errors in oxygen measurement with redox cycling of materials for hydrogen and syngas production. International Journal of Hydrogen Energy, 43 (19), pp. 9165-9180. Elsevier. DOI: 10.1016/j.ijhydene.2018.03.182 ISSN 0360-3199

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Official URL: https://www.sciencedirect.com/science/article/pii/S0360319918310140

Abstract

In the search for new and improved materials for hydrogen and syngas production by solar thermochemical looping, test-reactors are employed which include a temperature controlled sample chamber and adjustable gas flows through or past the sample. The experiments performed in these devices enable researchers to find limiting factors like mass transfer, heat transfer, kinetics, and material durability in a time and cost efficient manner. The devices have proven their utility by their near universal employment by groups seeking and studying new materials. A review of past studies has revealed that the measurement of oxygen partial pressure during the reduction state is key to the evaluation of material productivity, yet the methods for this measurement are varied across different publications and are often given little focus. The majority of O2 sensing is achieved using a mass spectrometer or gas chromatograph, inferring behavior at the sample from measurements of gas that has traveled for some distance and time. In this paper, we investigate the potential errors which may be introduced by taking a single measurement of oxygen production at the system outlet to infer O2 production curves, and demonstrate some methods to correct this. We also investigate some of the issues related to including an oxygen sensor near the sample. Issues discussed include temporal delays between sensors, oxygen leakage, sensing an incompletely mixed flow, diffusion, and mixing downstream from the sample. Oxygen entering the system through inlet gas or leakage accounted for the largest source of error, but these errors can be corrected by straightforward methods. Numerical simulations are employed to investigate the mixing of the flow, while diffusion is estimated with an analytical model. During an example experiment, the applied correction methods reduced differences between two sensors' data from 20% to 7%, while the corrections led to a 36% change in calculated total oxygen production from raw to corrected data.

Item URL in elib:https://elib.dlr.de/123175/
Document Type:Article
Title:Mitigation methods for errors in oxygen measurement with redox cycling of materials for hydrogen and syngas production
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lapp, JustinJustin.Lapp (at) dlr.deUNSPECIFIED
Rieping, ReneRene.Rieping (at) dlr.deUNSPECIFIED
Bulfin, Brendanbrendan.bulfin (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:19 April 2018
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:43
DOI :10.1016/j.ijhydene.2018.03.182
Page Range:pp. 9165-9180
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:Solar; Redox materials; Experimental; Oxygen sensing; Water splitting
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:19 Nov 2018 12:59
Last Modified:19 Nov 2018 12:59

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