1 2 The hydrothermal carbonation of calcium hydroxide (Ca(OH) 2) at high pressure of CO 2 3 (initial P CO2 = 55 bar) and moderate to high temperature (30 and 90°C) was used to synthesize 4 fine particles of calcite. This method allows a high carbonation efficiency (about 95% of 5 Ca(OH) 2-CaCO 3 conversion), a significant production rate (48 kg/m 3 h) and high purity of 6 product (about 96%). H...

We study the large-time behavior of the free boundary position capturing the one-dimensional motion of the carbonation reaction front in concrete-based materials. We extend here our rigorous justification of the √ t-behavior of reaction penetration depths by including non-linear effects due to deviations from the classical Henry’s law and time-dependent Dirichlet data.

Abstract Carbonation is a key mechanism for deterioration of reinforced concrete structures. In design resistance to carbonation, the performance mixes often specified and measured in laboratory carbonation tests where initial sometimes present specimens. The coherent interpretation results from vital as they enable more accurate prediction structures situ. This paper assesses two different app...

Carbon dioxide can react with alkaline carbonate substances in cement-based materials, which harms the durability of concrete structure. The carbonation reaction is a process releasing water, resulting an increase pore water saturation, was always neglected by previous studies. In this paper, transient saturation equation proposed and introduced into classical kinetic model, simulated finite-el...

Carbon dioxide (CO2) capture and sequestration includes a portfolio of technologies that can potentially sequester billions of tonnes of CO2 per year. Mineral carbonation (MC) is emerging as a potential CCS technology solution to sequester CO2 from smaller/medium emitters, where geological sequestration is not a viable option. In MC processes, CO2 is chemically reacted with calcium- and/or magn...

Continental flood basalts (CFB) are considered as potential CO2 storage sites because of their high reactivity and abundant divalent metal ions that can potentially trap carbon for geological timescales. Moreover, laterally extensive CFB are found in many place in the world within reasonable distances from major CO2 point emission sources.Based on the mineral and glass composition of the Columb...

Received on May 16, 2007; accepted on August 23, 2007. Correspondence concerning this article should be addressed to M. Aihara (E-mail address: [email protected]). Presented at International Symposium on Innovative Materials for Processes in Energy Systems, IMPRES, Kyoto, October, 2007. Carbonation/Decarbonation of Ca-Solid Reactant Derived from Natural Limestone for Thermal-Energy Storage and...

Experimental results are reported on the (Ca-looping) multicyclic CO2 capture of CaO and nanosilica/CaO composites derived from Ca(OH)2 and nanosilica/Ca(OH)2 dry mixtures subjected in-situ to linear and Constant Rate Thermal Analysis (CRTA) preheating programs in either air or air/CO2 atmospheres. By means of CRTA preheating the rates of the reactions taking place during pretreatment are kept ...

Flavour results from the integration of aroma, taste and chemosensory information within the brain. Understanding interactions between the anatomically separate systems which relay this information is crucial to our appreciation of how different aspects of food contribute to flavour perception and the formulation of successful products. To examine these interactions, a beverage system was creat...