## 1 Introduction
7H\({}_{2}\)O] to its highest purity of 99.2% could be deployed in medical, textile, tanning and agriculture industries [13]. A multi-year research and development by the Southern Research Company, a Sun Shot initiative of the US Department of Energy, was recently demonstrated for high-temperature thermochemical energy storage systems with the Concentrated Solar Power facilities [14; 15]. Such high-temperature thermochemical energy storage units are in demand due to the abundant availabilities of heat storage materials such as dolomite in the Central Florida's Phosphate mining sites [16; 17]. The commercial potential for the thermochemical energy storage and its marketable share predicted to be for year 2020 is \(\sim\)147 GW and for the year 2050, it is of the order of 1089 GW with energy storage cost assumed to be at least 15 USD/kWhth. The data for the thermodynamic and kinetic dissociation of dolomites are unambiguously unknown until recently [18]. The role of crystal structure on CO\({}_{2}\) capture by limestone derived CaO subjected to carbonation/re-carbonation/calcination cycles at Ca-Looping conditions were reported in the seminal paper published by [PERSON] et al. [19]. The equilibrium for the thermodynamic dissociations of dolomite is governed by the two reactiond given in equations below [20; 21]:\[\text{CaMg(CO}_{3})_{2}\leftrightarrow\text{MgO}+\text{CaO}+2\text{CO}_{2}\qquad \qquad\text{$\sim$}600\ ^{\circ}\text{C} \tag{1}\]  
High-temperature impregnation has been carried out on an alumina fabric and was thought to serve two purposes such as cumbersome-free calcination and carbonation looping [22] with a cyclic capacity increase. It has been shown that mechano-chemical synthesis [23] offers a simple, efficient, and inexpensive tool for the synthesis of highly stable CaO-containing sorbents for high-temperature CO\({}_{2}\) capture. The CO\({}_{2}\) capture behavior on the porous MgO material involves a two-stage adsorption process which is not caused by adsorbed products, and the adsorption process is minimized by inter-particle diffusion resistance [24]. An integrovernmental panel on climate change (IPCC) report [25] on reduction of greenhouse gases (GHG) emissions indicated they could be lowered by adhering to two stringent processes: (i) by sequestering and capturing atmospheric CO\({}_{2}\) or in coal power plants as produced CO\({}_{2}\) and (ii) developing thermochemical energy storage systems using earth-abundant materials. Based on such high-level recommendations, our project addresses the fundamental and applied aspects of calcium-magnesium carbonates [CaMg(CO\({}_{3}\))\({}_{2}\)] or dolomites which have previously been shown to have potential in thermal energy storage applications [8; 12; 18; 19; 20; 21; 22]. The present study is the first examination of the thermochemical energy storage feasibility in high-dolomite phosphatic pebbles obtained from the Florida Industrial and Phosphate Research (FIPR) Institute that are quite abundant in Central Florida's phosphate mining sites. Besides the earth abundancy that makes the system cost effective, these calcium-magnesium carbonates or high dolomite pebbles possesses high enthalpy of reaction which is suitable for their wide usage in sustainable and green technological applications such as thermochemical energy storage (TCES) and carbon dioxide capture (Carbon Capture and Storage, CCS) [26; 27; 28; 29; 30; 31; 32; 33; 34]. _Applications of Dolomites in Concentrated Solar Power Plants (CSPs)_  
Cheap, efficient, and non-toxic energy storage technologies are vital to handle the rapidly increasing usage of renewable energy at the power production plants, for example, grid stations, solar power plants and windmills. Solar energy-based power generation in concentrated solar power (CSP) plants often deploy phase change materials (PCMs) for storing the latent heat of the sun either received in parabolic troughs or dish-type configurations [35; 36].