Mechanical Activation of CaO‐Based Adsorbents for CO<sub>2</sub> Capture

Sayyah, Maryam; Lu, Yongqi; Masel, Richard I.; Suslick, Kenneth S.

doi:10.1002/cssc.201200454

Cited by 53 publications

(37 citation statements)

References 23 publications

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“…Third, the reduction of inorganic carbonates with MHs can be considered as an indirect CO 2 utilization approach as well as a means of storing or synthesizing fuels. Furthermore, the produced inorganic metal oxides can be used as CO 2 sorbents . To the best of our knowledge, CO 2 methanation and the synthesis of hydrogen/methane fuel mixtures by solid–solid reactions of metal carbonates and MHs have not been reported so far, despite the fact that mechanochemical syntheses are simple, efficient, inexpensive, and easily accessible methods of preparing compounds at room temperature, as exemplified by the widespread use of ball milling–induced, gas–gas, solid–gas, or solid–solid reactions in the recent years …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the produced inorganic metal oxides can be used as CO 2 sorbents. [31,32] To the best of our knowledge, CO 2 methanation and the synthesis of hydrogen/methane fuel mixtures by solid-solid reactions of metal carbonates and MHs have not been reported so far, despite the fact that mechanochemical syntheses are simple, efficient, inexpensive, and easily accessible methods of preparing compounds at room temperature, [31,33] as exemplified by the widespread use of ball milling-induced, gas-gas, solid-gas, or solid-solid reactions in the recent years. [34] Herein, we aimed at realizing CO 2 methanation and preparing CO x -free hydrogen/methane fuel mixtures using metal carbonates and MHs as carbon and hydrogen sources instead of gaseous CO 2 and H 2 , respectively, and investigated for the first time noncatalyzed mechanochemical reactions of metal carbonates with MHs at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

et al. 2019

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The realization of effective CO2 conversion into valuable hydrocarbons is a promising way of addressing the current environmental and energy issues. A convenient, highly selective, and efficient method of CO2 methanation and the synthesis of COx‐free hydrogen/methane fuel mixtures by ball milling‐induced reactions of alkaline carbonates with metal hydrides (MHs) is reported. The natural resources of MgCO3/CaCO3 and MgH2/CaH2 are used as carbon and hydrogen sources, respectively. Mechanochemical investigations of the room‐temperature reactions indicate that some alkaline carbonates can be reduced by MHs under catalyst‐free conditions to selectively afford CH4 as the sole hydrocarbon product in yields of up to 73%. Moreover, the contents of methane in the gaseous products and its yield are shown, which mainly depend on the nature of metal carbonates/hydrides, rate and duration of ball milling, and reaction mixture composition. Thus, this study opens new ways to achieve the CO2 utilization and synthesize of COx‐free hydrogen and methane fuel mixtures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

et al. 2019

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“…[20,21] One example is the use of metal oxides and hydroxides that can capture CO 2 by chemical reaction to form solid carbonates. [22][23][24][25][26][27] However, the high temperatures typically required for their regeneration is a disadvantage for the two CO 2 capture applications considered here. Alternatively, a variety of porous solids have also been developed and used for such CO 2 capture applications.…”

Section: Introductionmentioning

confidence: 99%

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties

et al. 2014

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Solid oxide-supported amine sorbents for CO2 capture are amongst the most rapidly developing classes of sorbent materials for CO2 capture. Herein, basic γ supports are used as hosts for amine sites through the grafting of 3-aminopropyltrimethoxysilane to the alumina surface under a variety of conditions, yielding the expected surface-grafted alkylamine groups, as demonstrated by FTIR spectroscopy and (29)Si and (13)C cross-polarization magic-angle spinning (CPMAS NMR) spectroscopy. Grafting amine sites on the surface in the presence of water leads to a high density of amine sites on the surface whereas simultaneously creating a unique type of aluminum species on the surface, as demonstrated by both 1D and 2D (27)Al MAS NMR spectroscopy. The thus prepared sorbents result in higher CO2 adsorption capacities and amine efficiencies compared to sorbents prepared in the absence of water or similar amine loading sorbents prepared using silica supports. In situ FTIR spectra of the sorbents exposed to CO2 at various pressures show no distinct difference in the nature of the adsorbed CO2 species on alumina- versus silica-supported amines, whereas water adsorption isotherms show that the improved performance of the amine-grafted alumina support is not a consequence of retained water on the more hydrophobic aminoalumina materials. The findings demonstrate that amine-grafted, basic alumina materials can be tuned to be more efficient than the corresponding silica-supported materials at comparable amine loadings, further demonstrating that the properties of amine sites can be tuned by controlling or adjusting the support surface properties.

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“…Therefore, in order to apply CaCO 3 natural minerals to TCES system, the future research should focus on avoiding pore plugging. It is found that some treatment methods such as thermal activation, hydration, and mechanical activation or milling can improve the cycle stability of CaO. The structure of CaO can also be stabilized by the addition of inert materials …”

Section: Brief Introduction Of Tces Systemmentioning

confidence: 99%

Progress in thermochemical energy storage for concentrated solar power: A review

et al. 2018

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Summary Energy plays an important role in a fast‐paced modern society. With the depletion of fossil energy, effective utilization of solar energy is getting increasingly urgent. Thermal energy storage is an inevitable choice for effective utilization of renewable energy sources. As one of the most promising renewable energy sources, solar energy is inexhaustible. But it has some shortcomings such as instability and intermittency, affected by time, climate, and geographical location. Thermal energy storage technology, which can effectively reduce the cost of concentrated solar power generation, plays a crucial role in bridging the gap between energy supply and demand. In addition, thermal energy storage subsystem can improve performance and reliability of the whole energy system. According to different principles, thermal storage technology is generally classified as sensible heat storage, latent heat storage, and thermochemical energy storage. Most solar thermal power generation systems, currently demonstrated and operated in the world, adopt the method of sensible thermal energy storage. In contrast, thermochemical energy storage is a relatively new concept, which is still in the stage of basic test and verification. Thermochemical energy storage technology stores and releases energy through endothermic and exothermic reversible reactions. A closed system with separated reactants and products, in theory, can store energy indefinitely. The main thermochemical energy storage systems include redox system, metal hydride system, carbonate decomposition system, ammonia decomposition system, methane reforming system, and inorganic hydroxide system.

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Mechanical Activation of CaO‐Based Adsorbents for CO₂ Capture

Cited by 53 publications

References 23 publications

Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties

Progress in thermochemical energy storage for concentrated solar power: A review

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Mechanical Activation of CaO‐Based Adsorbents for CO2 Capture

Cited by 53 publications

References 23 publications

Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

Highly Selective Room‐Temperature Catalyst‐Free Reduction of Alkaline Carbonates to Methane by Metal Hydrides

Aminosilanes Grafted to Basic Alumina as CO2 Adsorbents—Role of Grafting Conditions on CO2 Adsorption Properties

Progress in thermochemical energy storage for concentrated solar power: A review

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Mechanical Activation of CaO‐Based Adsorbents for CO₂ Capture

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties