The Inactivation kinetics of alpha-glucosidase, glucoamylase, alpha-amylase, and acid carboxypeptidase in fresh sake using a continuous flow system for high-pressure carbonation were investigated. In addition, the effects of ethanol and sugar concentrations on inactivation of the enzymes in high-pressure carbonated sake were investigated. Among the enzymes investigated, alpha-glucosidase was th...

Coal combustion by-products such as fly ash (FA), brine and CO2 from coal fired power plants have the potential to impact negatively on the environment. Reaction of CO2 with FA/ brine slurry can potentially provide a viable route for CO2 sequestration through formation of mineral carbonates. Fractionated FA has varying amounts of CaO which not only increases the brine pH but can also be convert...

Retrograde metamorphism (mineral hydration, carbonation and oxidation) is important in controlling the composition and rheology of the Earth’s crust and upper mantle, particularly along tectonic plate margins, and in proposed mechanisms for geothermal power generation and engineered, geological carbon storage. Retrograde processes can lead to an increase in solid mass and volume, or can be redu...

Carbonation is the water-mediated replacement of silicate minerals, such as olivine, by carbonate, and is commonplace in the Earth's crust. This reaction can remove significant quantities of CO2 from the atmosphere and store it over geological timescales. Here we present the first direct evidence for CO2 sequestration and storage on Mars by mineral carbonation. Electron beam imaging and analysi...

Mineralogical phases of steelmaking slags have significant influences on the carbonation of the slags. In this paper, the effects of temperature and reaction time on the conversion of calcium-related phases and the carbonation degree of a slag sample were studied. The experimental conditions were a liquid-to-solid ratio of 20 mL/g, a carbon dioxide flow rate of 1 L/min and a slag particle size ...

Mineral carbonation involves the capture and storage of carbon dioxide in carbonate minerals. Mineral carbonation presents opportunities for the recycling of steel slags and other alkaline residues that are currently landfilled. The Carbstone process was initially developed to transform non-hydraulic steel slags [stainless steel (SS) slag and basic oxygen furnace (BOF) slags] in high-quality co...

The reaction CO2 +Ca(OH)2 → H2O+CaCO3 takes place in unsaturated porous concrete-based materials with separated reactants, where CO2 and H2O are diffusing and Ca(OH)2 can be assumed as immobile. The process (called carbonation) plays an important role in the service life of concrete-based structures. Our aims are threefold: (1) We study via a matched-asymptotics approach the occurrence of two d...

The potential environmental effects of increasing atmospheric CO2 levels are of major worldwide concern. One alternative for managing CO2 emissions is carbon sequestration: the capture and secure confinement of CO2 before it is emitted to the atmosphere. Successful technologies must be environmentally benign, permanent, economically viable, safe and effective. As a result, their timely developm...

B. Arias, J. C. Abanades, E. J. Anthony 1 Instituto Nacional del Carbón, (CSIC), C/Francisco Pintado Fe, No. 26, 33011 Oviedo, Spain. 2 CanmetENERGY, Natural Resources Canada, 1 Haanel Drive, Ottawa, Ontario, Canada K1A 1M1. [email protected]; [email protected]; [email protected] RECEIVED DATE (Corresponding author e-mail address: [email protected]; Phone: +34 985 119 057; Fax: +34 ...

Carbon sequestration by reacting naturally occurring Mg and Ca containing minerals with CO2 to form carbonates has many unique advantages. Most notably is the fact that carbonates have a lower energy state than CO2, which is why mineral carbonation is thermodynamically favorable and occurs naturally (e.g., the weathering of rock over geologic time periods). Secondly, the raw materials such as m...