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Title: Exploration of the Role of Heat Activation in Enhancing Serpentine Carbon Sequestration Reactions

Abstract

As compared with other candidate carbon sequestration technologies, mineral carbonation offers the unique advantage of permanent disposal via geologically stable and environmentally benign carbonates. The primary challenge is the development of an economically viable process. Enhancing feedstock carbonation reactivity is key. Heat activation dramatically enhances aqueous serpentine carbonation reactivity. Although the present process is too expensive to implement, the materials characteristics and mechanisms that enhance carbonation are of keen interest for further reducing cost. Simultaneous thermogravimetric and differential thermal analysis (TGA/DTA) of the serpentine mineral lizardite was used to isolate a series of heat-activated materials as a function of residual hydroxide content at progressively higher temperatures. Their structure and composition are evaluated via TGA/DTA, X-ray powder diffraction (including phase analysis), and infrared analysis. The meta-serpentine materials that were observed to form ranged from those with longer range ordering, consistent with diffuse stage-2 like interlamellar order, to an amorphous component that preferentially forms at higher temperatures. The aqueous carbonation reaction process was investigated for representative materials via in situ synchrotron X-ray diffraction. Magnesite was observed to form directly at 15 MPa CO{sub 2} and at temperatures ranging from 100 to 125 C. Carbonation reactivity is generally correlated with the extent ofmore » meta-serpentine formation and structural disorder.« less

Authors:
; ; ; ;  [1]
  1. ASU
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1008915
Resource Type:
Conference
Resource Relation:
Conference: 29th International Technical Conference on Coal Utilization & Fuel Systems ;April 18-22, 2004;Clearwater, Florida
Country of Publication:
United States
Language:
ENGLISH
Subject:
01 COAL, LIGNITE, AND PEAT; 43 PARTICLE ACCELERATORS; CARBON SEQUESTRATION; CARBONATES; COAL; DIFFERENTIAL THERMAL ANALYSIS; DIFFRACTION; EXPLORATION; FUEL SYSTEMS; HYDROXIDES; SERPENTINE; SYNCHROTRONS; X-RAY DIFFRACTION

Citation Formats

McKelvy, M J, Chizmeshya, A V.G., Diefenbacher, J, Bearat, H, and Wolf, G. Exploration of the Role of Heat Activation in Enhancing Serpentine Carbon Sequestration Reactions. United States: N. p., 2005. Web.
McKelvy, M J, Chizmeshya, A V.G., Diefenbacher, J, Bearat, H, & Wolf, G. Exploration of the Role of Heat Activation in Enhancing Serpentine Carbon Sequestration Reactions. United States.
McKelvy, M J, Chizmeshya, A V.G., Diefenbacher, J, Bearat, H, and Wolf, G. 2005. "Exploration of the Role of Heat Activation in Enhancing Serpentine Carbon Sequestration Reactions". United States.
@article{osti_1008915,
title = {Exploration of the Role of Heat Activation in Enhancing Serpentine Carbon Sequestration Reactions},
author = {McKelvy, M J and Chizmeshya, A V.G. and Diefenbacher, J and Bearat, H and Wolf, G},
abstractNote = {As compared with other candidate carbon sequestration technologies, mineral carbonation offers the unique advantage of permanent disposal via geologically stable and environmentally benign carbonates. The primary challenge is the development of an economically viable process. Enhancing feedstock carbonation reactivity is key. Heat activation dramatically enhances aqueous serpentine carbonation reactivity. Although the present process is too expensive to implement, the materials characteristics and mechanisms that enhance carbonation are of keen interest for further reducing cost. Simultaneous thermogravimetric and differential thermal analysis (TGA/DTA) of the serpentine mineral lizardite was used to isolate a series of heat-activated materials as a function of residual hydroxide content at progressively higher temperatures. Their structure and composition are evaluated via TGA/DTA, X-ray powder diffraction (including phase analysis), and infrared analysis. The meta-serpentine materials that were observed to form ranged from those with longer range ordering, consistent with diffuse stage-2 like interlamellar order, to an amorphous component that preferentially forms at higher temperatures. The aqueous carbonation reaction process was investigated for representative materials via in situ synchrotron X-ray diffraction. Magnesite was observed to form directly at 15 MPa CO{sub 2} and at temperatures ranging from 100 to 125 C. Carbonation reactivity is generally correlated with the extent of meta-serpentine formation and structural disorder.},
doi = {},
url = {https://www.osti.gov/biblio/1008915}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 29 00:00:00 EST 2005},
month = {Tue Mar 29 00:00:00 EST 2005}
}

Conference:
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