Developing an Atomic-Level Understanding to Enhance CO 2 Mineral Sequestration Reaction Processes via Materials and Reaction Engineering

Hamdallah Bearat's picture
Research Title: 
Fuel and Energy Abstracts, Volume: 43
Michael J. McKelvy
Andrew V.G. Chizmeshya
Hamdallah Bearat
Renu Sharma
R.W. Carpenter
Sat, 2001-12-01
Developing_an_Atomic-Level_Understanding_to_Enhance_CO_2_Mineral_Sequestration_Reaction_Processes_via_Materials_and_Reaction_Engineering.pdf930.75 KB
Research Abstract: 
Over the last decade, discussion has evolved from whether exponentially increasing anthropogenic CO 2 emissions will adversely affect the global environment, to the timing and magnitude of their impact. A variety of sequestration technologies are being explored to mitigate CO 2 emissions. These technologies must be both environmentally benign and economically viable. Mineral carbonation is an attractive candidate technology as it disposes of CO 2 as geologically stable, environmentally benign mineral carbonates, clearly satisfying the first criteria. The primary challenge for mineral carbonation is cost-competitive process development. Mg-rich lamellar hydroxides offer exciting potential as widely available, low-cost feedstock materials (e.g., serpentines). Furthermore, dehydroxylation offers the intriguing potential to disrupt these materials down to the atomic level, substantially enhancing their carbonation reactivity, a key component in reducing process cost. Over the past year and a half, we have been studying dehydroxylation/carbonation reaction processes for the prototype Mg-rich lamellar-hydroxide: Mg(OH) 2. The primary goal is to develop the fundamental mechanistic understanding needed to enhance carbonation reactivity. Recently, we discovered Mg(OH) 2 dehydroxylation is best described as a lamellar nucleation and growth process, which can access a range of new, potentially high-surface-area, lamellar oxyhydroxide intermediate materials, Mg x+y O x (OH) 2y. These materials provide access to a broad range of new carbonation reaction pathways via dehydroxylation/rehydroxylation, which can dramatically increase carbonation reactivity. Similar mechanisms may be more broadly applicable to Mg/Ca-rich lamellar-hydroxide-based mineral (e.g., serpentine) carbonation processes, offering substantial potential for reducing CO 2 mineral sequestration process costs. This effort is a part of the Mineral Carbonation Study Program managed by DOE, which also includes participants from the  ...
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