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Processing and Characterisation of Fe-based oxygen carriers for chemical looping processes

Yoran De Vos UGent, Marijke Jacobs, Pascal Van Der Voort UGent, Isabel Van Driessche UGent, Frans Snijkers and An Verberckmoes UGent (2016) Annual Meeting of the Belgian and French Ceramic Societies, Abstracts.
abstract
Chemical looping reforming (CLR) and chemical looping combustion (CLC) are promising technologies with inherent CO2 capture for transforming fuels into syngas and energy respectively. Circulating oxygen carriers (OC) are used to transfer oxygen from mostly air to the fuel inside the process. Over the past years a variety of materials have been proposed for the role of oxygen carriers, ranging from bulk mineral powders to ceramic oxygen carrier particles engineered for shape, size and composition. A lot of attention has been focused towards the development of Ni-based oxygen carriers due to their good reactivity, conversion and mechanical stability. However the cost, susceptibility towards S-containing impurities and their toxicity are key drivers to develop Ni-free materials. Oxygen carriers based on Fe-oxides are promising because of their lower cost and diminished impact on health and environment. Nevertheless, they also need good thermo-chemo-mechanical properties and thus a sufficient lifetime to be applicable in industrial CL-processes. The longevity of the oxygen carriers in the coupled fluidised bed reactors can be limited by two factors, such as their fragmentation and attrition leading to smaller particles inhibiting their fluidisation as well as their chemical deactivation. Granulation by the industrial spray drying technique appears to yield oxygen carrier particles with high sphericity and good fluidization properties. In addition, a microstructure is obtained that on the one hand aims at thermo-chemo-mechanical integrity and high attrition resistance, and on the other hand at intimate contact between the solid and gaseous phases. However, spray-drying does not appear to be used for producing Fe-based OC thus far. This work emphasises the colloid chemistry of concentrated suspensions used for spray-drying, the development of ceramic Fe-based OC by granulation of primary raw materials and the subsequent processing and heat treatment of the oxygen carriers for hydrogen production by chemical looping. To reach the objectives, a systematic approach is used. At first the role of the preparation of the spray dry suspension and the granulation conditions on the morphology of the particles has been investigated. Secondly, the effect of the sinter process was studied. A correlation between tapped density, strength and attrition resistance of the heat-treated materials was observed. Finally, the chemical performance of these Fe-based oxygen carriers was examined in a small scale batch reactor. The chemical composition of the OC was (ex situ) monitored in view of the enhancement of the chemical properties and long term stability thereof by altering the composition and microstructure of synthesised oxygen carriers.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
Oxygen carriers, Chemical looping, spray drying
in
Annual Meeting of the Belgian and French Ceramic Societies, Abstracts
place of publication
Valenciennes, France
conference name
Annual Meeting of the Belgian and French Ceramic Societies
conference location
Valenciennes, France
conference start
2016-03-22
conference end
2016-03-24
language
English
UGent publication?
yes
classification
C3
id
7178346
handle
http://hdl.handle.net/1854/LU-7178346
date created
2016-04-08 13:19:45
date last changed
2018-01-29 12:12:38
@inproceedings{7178346,
  abstract     = {Chemical looping reforming (CLR) and chemical looping combustion (CLC) are promising technologies with inherent CO2 capture for transforming fuels into syngas and energy respectively. Circulating oxygen carriers (OC) are used to transfer oxygen from mostly air to the fuel inside the process. Over the past years a variety of materials have been proposed for the role of oxygen carriers, ranging from bulk mineral powders to ceramic oxygen carrier particles engineered for shape, size and composition. A lot of attention has been focused towards the development of Ni-based oxygen carriers due to their good reactivity, conversion and mechanical stability. However the cost, susceptibility towards S-containing impurities and their toxicity are key drivers to develop Ni-free materials. Oxygen carriers based on Fe-oxides are promising because of their lower cost and diminished impact on health and environment. Nevertheless, they also need good thermo-chemo-mechanical properties and thus a sufficient lifetime to be applicable in industrial CL-processes. The longevity of the oxygen carriers in the coupled fluidised bed reactors can be limited by two factors, such as their fragmentation and attrition leading to smaller particles inhibiting their fluidisation as well as their chemical deactivation.

Granulation by the industrial spray drying technique appears to yield oxygen carrier particles with high sphericity and good fluidization properties. In addition, a microstructure is obtained that on the one hand aims at thermo-chemo-mechanical integrity and high attrition resistance, and on the other hand at intimate contact between the solid and gaseous phases. However, spray-drying does not appear to be used for producing Fe-based OC thus far.

This work emphasises the colloid chemistry of concentrated suspensions used for spray-drying, the development of ceramic Fe-based OC by granulation of primary raw materials and the subsequent processing and heat treatment of the oxygen carriers for hydrogen production by chemical looping. To reach the objectives, a systematic approach is used. At first the role of the preparation of the spray dry suspension and the granulation conditions on the morphology of the particles has been investigated. Secondly, the effect of the sinter process was studied. A correlation between tapped density, strength and attrition resistance of the heat-treated materials was observed. Finally, the chemical performance of these Fe-based oxygen carriers was examined in a small scale batch reactor. The chemical composition of the OC was (ex situ) monitored in view of the enhancement of the chemical properties and long term stability thereof by altering the composition and microstructure of synthesised oxygen carriers.},
  author       = {De Vos, Yoran and Jacobs, Marijke and Van Der Voort, Pascal and Van Driessche, Isabel and Snijkers, Frans and Verberckmoes, An},
  booktitle    = {Annual Meeting of the Belgian and French Ceramic Societies, Abstracts},
  keyword      = {Oxygen carriers,Chemical looping,spray drying},
  language     = {eng},
  location     = {Valenciennes, France},
  title        = {Processing and Characterisation of Fe-based oxygen carriers for chemical looping processes},
  year         = {2016},
}

Chicago
De Vos, Yoran, Marijke Jacobs, Pascal Van Der Voort, Isabel Van Driessche, Frans Snijkers, and An Verberckmoes. 2016. “Processing and Characterisation of Fe-based Oxygen Carriers for Chemical Looping Processes.” In Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France.
APA
De Vos, Y., Jacobs, M., Van Der Voort, P., Van Driessche, I., Snijkers, F., & Verberckmoes, A. (2016). Processing and Characterisation of Fe-based oxygen carriers for chemical looping processes. Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Presented at the Annual Meeting of the Belgian and French Ceramic Societies, Valenciennes, France.
Vancouver
1.
De Vos Y, Jacobs M, Van Der Voort P, Van Driessche I, Snijkers F, Verberckmoes A. Processing and Characterisation of Fe-based oxygen carriers for chemical looping processes. Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France; 2016.
MLA
De Vos, Yoran, Marijke Jacobs, Pascal Van Der Voort, et al. “Processing and Characterisation of Fe-based Oxygen Carriers for Chemical Looping Processes.” Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France, 2016. Print.