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  • Changes in Limestone Sorbent Morphology during

    Two limestones were evaluated for CaO-CaCO 3 looping. Changes in the sorbent morphology during the tests were identified by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX). Changes in pore size distribution and sorbent surface area that occurred during reaction were determined by N 2 BET porosimetry ...

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  • Changes in Limestone Sorbent Morphology during

    Request PDF | Changes in Limestone Sorbent Morphology during CaO‐CaCO3 Looping at Pilot Scale | A pilot-scale dual fluidized bed combustion system was

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  • Changes in Limestone Sorbent Morphology during

    2009-3-1 · A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping. The sorbent was regenerated at high temperature using an air‐ or oxygen‐fired fluidized bed calciner with flue gas recycle firing hardwood pellets. Two limestones were evaluated for CaO‐CaCO3 looping. Changes in the sorbent morphology

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  • Morphological Changes of Limestone Sorbent Particles ...

    2019-12-12 · Carbonation and calcination looping cycles were carried out on four limestones in a thermogravimetric analyzer (TGA). The CO2 carrying capacity of a limestone particle decays very quickly in the first 10 cycles, reducing to about 20% of its original uptake capacity after 10 cycles for the four limestones studied in this work, and it decreases further to 6−12% after 50 cycles.

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  • Optimization of the structural characteristics of CaO and ...

    2018-6-19 · The sorbent prepared via the mechanical mixing of CaCO 3 and MgCO 3 exhibits a very similar trend as limestone-derived CaO, both in terms of CO 2 uptake and cyclic stability.

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  • Improvement of Limestone-Based CO2 Sorbents for Ca

    The resulting decomposition of CaCl2 to CaO during calcination caused changes in the particle morphology, which in turn decreased the CO2 diffusional resistance during carbonation.

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  • Evolution of the Surface Area of Limestone during ...

    2016-2-2 · Calcination, Sintering, Limestone, Combined Model 1. Introduction Sintering refers to changes in pore shape, pore shrinkage and the the increase in grain size that CaO particles undergo during heating. The rate of CaO sintering increases at higher temperatures, as well as at higher partial pressures of carbon dioxide and steam vapor.

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  • Enhancement of CO2 capture capacity by modifying

    2013-1-1 · The limestone used here is naturally occurring in Jinan, China. The chemical components of the limestone are shown in Table 1.The modified limestone used in this study was prepared by reaction between the calcined limestone and the propionic acid (analytically pure, > 99%).Theoretically, 1 M CaO can react with 2 M propionic acids.In order to make sure that all

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  • Calcium looping sorbents for CO2 capture - ScienceDirect

    2016-10-15 · In a small molar ratio (4:1 CaO to propionic acid), the modified sorbent exhibited a capture capacity of 0.24 after 100 cycles, approximately four times the capacity of natural limestone . Pyroligneous acid (PA) has also been investigated [99] , and it produces a primary phase of calcium acetate hydrate in the modified sorbent.

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  • Investigation of a stable synthetic sol–gel CaO sorbent ...

    2012-4-1 · In this study a synthetic calcium oxide sorbent was prepared using a sol–gel synthesis method. The synthesized CaO and a reference CaO, obtained through the calcination of commercial CaCO 3, were characterized by means of X-ray diffraction, N 2 adsorption and SEM microscopy. For the reference CaO, results from cyclic carbonation and calcination showed

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  • Optimization of the structural characteristics of CaO and ...

    2018-6-19 · The sorbent prepared via the mechanical mixing of CaCO 3 and MgCO 3 exhibits a very similar trend as limestone-derived CaO, both in terms of CO 2 uptake and cyclic stability.

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  • Investigation of natural CaO–MgO sorbent for CO2

    H2O changes the sorbent morphology producing bigger particles and pores for the sintering during calcination but makes the sorbent have more

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  • Na2CO3-modified CaO-based CO2 sorbents: the effects

    CaO (s) + CO 2 (g) 2 CaCO 3 (s), DH 0 298K = 178 kJ mol 1 and stands out due to the very high theoretical CO 2 uptake capacity of CaO (0.78 g CO 2 g sorbent 1), low predicted CO 2 capture costs(ca. 23.7 USD t CO 2 1)6 and the high abundance andinexpen-siveness of naturally-occurring CaO precursors, e.g. limestone.7 However, the Tammann ...

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  • Steam Enhanced Calcination for CO2 Capture with CaO

    2017-1-31 · Steam changes the morphology of the sorbent during calcination, likely by shifting the pore volume to larger pores, resulting in a structure which has an increased carrying capacity. This effect was then examined at the pilot scale to determine if the phase contacting patterns and solids heat-up rates in a fluidized bed were factors.

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  • Pressurised Calcination: Atmospheric Carbonation of

    2018-1-25 · changes in sorbent morphology and microstructure of calcined particles after the first and final cycles were investi-gated using scanning electron microscopy (SEM). The specific surface area, pore volume, porosity, and pore size distribu-tion of the CaO particles were also determined. More details of ...

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  • fl and the Negative Infl OonCO Capture by

    2021-2-20 · when limestone-derived CaO is used as the sorbent. Limestone is a widely available natural CaCO 3 source used in cement production, steel manufacturing, and flue gas desulfurization. The opportunity for synergy with industrial processes, coupled with the low cost of limestone, contributes to the economic

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  • Morphological analysis of sulfated Ca-based sorbents

    2018-1-11 · The sulfation process involves important changes in the sorbent morphology, which could vary depending on the operating conditions and be different to those observed in conventional air combustion. This work analyzes the morphological variations observed during limestone and dolomite sulfation at typical oxy-fuel combustion conditions (high CO2

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  • Investigation of natural CaO–MgO sorbent for CO2

    2013-4-3 · The CaO–MgO sorbent has the best cyclic activity when H 2 O is present during both carbonation and calcination. H 2 O changes the sorbent morphology producing bigger particles and pores for the sintering during calcination but makes the sorbent have more stable surface area for the taking palace of the fast kinetic carbonation reaction ...

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  • Macropore-Stabilized Limestone Sorbents Prepared by the ...

    Further investigation on microstructure changes of the sorbents showed that the macropores were relatively stable during cyclic reactions, which can be attributed to the stable behavior of the sorbent. In contrast, the natural limestone lost its micro- and macropores during initial reactions, thereby rapidly losing its sorption capacity during ...

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  • Physical and micro-structural characteristics of limestone ...

    2019-10-31 · Temperature is a major factor affecting physical and mechanical rock properties. With increasing temperature, a series of variations enlarge the internal defects within rocks, resulting in physical and mechanical rock property variations. To explore the influence of temperature on the physical and micro-structure of limestone, the weighing test and P-wave

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