changes in limestone sorbent morphology during cao

Calcium Looping for Carbon Dioxide and Sulfur Dioxide Co ...

is a high temperature separation process that utilizes limestone-derived CaO to simultaneously concentrate CO 2 and capture SO 2 from flue gas. The solid CaO particles ... support with the various equipment used during the course of this work, and those ... 3.3.4 The Influence of Sorbent Cycling on Morphology and Capture

Energies | Free Full-Text | The Zr-Doped CaO CO2 Sorbent ...

We fabricated the Zr-doped CaO sorbent for high-temperature CO2 capture by the wet high-energy co-milling of calcium carbonate and natural zirconium dioxide (baddeleyite) for the first time. The morphology of the material was examined by scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. Its CO2 uptake capacity was determined using thermogravimetric analysis.

Mechanistic Understanding of CaO‐Based Sorbents for High ...

 · 2 Morphological and Structural Evolution of CaO−CaCO 3 Sorbents During Operation . The carbonation reaction of CaO occurs in two stages (Figure 2a): I) a fast, kinetically-controlled regime, that is followed by II) a significantly slower, diffusion-controlled regime. 28, 29 The transition between the two regimes has been linked to a critical product layer thickness. 29 Most works report a ...

Post-combustion CO2 capture by formic acid-modified CaO ...

 · The performance of CaO-based sorbents modified with formic acid in both its liquid and vapor phase has been investigated for high-temperature post-combustion CO 2 capture in calcium-looping cycles. The treatment of limestone with aqueous solutions containing 10 or 30 vol% formic acid was found to promote crystal growth contrast, higher acid concentrations produced smaller crystals.

Edward Anthony

 · Edward Anthony studies Greenhouse Gas Emissions, Biomass energy, and Air Pollution Control. A practising scientist.

Influence of High-Temperature Steam on the Reactivity of ...

 · Calcium looping is a high-temperature CO2 capture technology applicable to the postcombustion capture of CO2 from power station flue gas, or integrated with fuel conversion in precombustion CO2 capture schemes. The capture technology uses solid CaO sorbent derived from natural limestone and takes advantage of the reversible reaction between CaO and CO2 to form …

Changes in physical structure during calcination of ...

Calcite during calcination is decarbonized according to the reaction CaCO3 → CaO + CO2. The quality of such sorbent is usually being related to its total uptake of sulfur dioxide, which is frequently considered to depend mainly on chemical composition of the sorbent, especially CaCO3 content.

fl and the Negative Infl OonCO Capture by Metamorphosed ...

limestone-derived sorbents is expected to differ from that of unmetamorphosed limestone-derived sorbents because lime-stone-derived sorbent activities and reactivities are determined by sorbent morphology, specifically, crystalline structure, porosity, and surface area.23−25 The primary sintering mechanisms responsible for reducing

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ...

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 ...

Dual Anti‐Sintering Mechanism of Highly Stable CaO‐Based ...

 · After 30 cycles, the limestone-derived sorbents with 12.5 wt % MgO loading show about 180 % higher carbonation conversion together with a nearly six times faster rate of CO 2 sorption in the diffusion-controlled step, compared to unmodified samples. The incorporating MgO using magnesium basic carbonate can partially dissolve into CaO during ...

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ...

 · Changes in Limestone Sorbent Morphology during CaO‐CaCO3 Looping at Pilot Scale Changes in Limestone Sorbent Morphology during CaO‐CaCO3 Looping at Pilot Scale Hughes, R. W.; Macchi, A.; Lu, D. Y.; Anthony, E. J. 2009-03-01 00:00:00 A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping.

Preparation and Application of the Sol-Gel Combustion ...

›› 2014, Vol. 22 ›› Issue (9): 991-999. doi: 10.1016/j.cjche.2014.06.034. • • . Preparation and Application of the Sol-Gel Combustion Synthesis-Made CaO/CaZrO 3 Sorbent for Cyclic CO 2 Capture Through the Severe Calcination Condition . Baowen Wang 1,2, Xiaoyong Song 1, ZonghuaWang 3, Chuguang Zheng 2

Fedunik-Hofman 2019. Kinetics of Solid-Gas Reactions and ...

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R. W. Hughes | Semantic Scholar

Semantic Scholar profile for R. W. Hughes, with 26 highly influential citations and 77 scientific research papers.

(PDF) SO 2 Retention by CaO-Based Sorbent Spent in CO 2 ...

SO 2 Retention by CaO-Based Sorbent Spent in CO 2 Looping Cycles. Industrial & Engineering Chemistry Research, 2009. Edward J Anthony. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

[PDF] Morphological analysis of sulfated Ca-based sorbents ...

Abstract The use of Ca-based sorbents in circulating fluidized beds (CFB) allows the in-situ desulfurization in oxy-fuel combustion processes. 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 ...

Improved Long-Term Conversion of Limestone-Derived ...

 · Changes in Limestone Sorbent Morphology during CaO-CaCO 3 Looping at Pilot Scale. Chemical Engineering & Technology 2009, 32 (3), 425-434. DOI: 10.1002/ceat.200800590.

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ...

Two limestones were evaluated for CaO-CaCO3 looping. Changes in the sorbent morphology during the tests were identified by scanning electron microscopy (SEM) with energy dispersive X-ray ...

Morphological Changes of Limestone Sorbent Particles ...

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. A new steam ...

Study on the interaction between CaO-based sorbents and ...

 · Changes in limestone sorbent morphology during CaO CaCO 3 looping at pilot scale Chem. Eng. Technol., 32 ( 2009 ), pp. 425 - 434 CrossRef View Record in Scopus Google Scholar

IJERPH | Free Full-Text | Lime-Based Sorbents for High ...

A portion of the CaO sorbent is, therefore, lost as CaSO 4, and the CaO reaction surface is covered by this product, preventing contact of CaO and CO 2 [15,16]. Attrition of sorbent is a significant problem for FBC systems, leading to sorbent elutriation from the reactor [ 17 ].

(PDF) Influence of calcination conditions on carrying ...

The loss of activity is caused by sorbent sintering, i.e., 10 change in particle morphology due to CaO sub-grain growth as 0 well as melting at micro-surfaces that contain impurities, such as 0 …

Reactivity of CaO-based sorbent for Calcium Looping ...

Reactivity of CaO-based sorbent for Calcium Looping Technology in presence of steam ... conditions such as temperature and pressure causes changes in the sorbent initial morphology, responsible for the sorbent decay. ... in order to understand the evolution of the sorbent morphology during cycles. The Random Pore Model was applied to the

Spray water reactivation/pelletization of spent CaO-based ...

 · This paper presents a novel method for reactivation of spent CaO-based sorbents from calcium looping (CaL) cycles for CO(2) capture. A spent Cadomin limestone-derived sorbent sample from a pilot-scale fluidized bed (FBC) CaL reactor is used for reactivation. The calcined sorbent is sprayed by water in a pelletization vessel.

Limestone as a sorbent for CO2 capture and its application ...

Calcium oxide-based CO₂ capture is a relatively mature technology, ready for implementation. Limestone CaO precursor is relatively low-cost and readily available. A thorough understanding of the CaO-CO₂ reaction and its reversibility over multiple cycles is required to aid in design, improve efficiency and reduce costs of industrial capture ...

Morphological Changes of Limestone Sorbent Particles ...

It was observed that during CO 2 cycles, the sorbent morphology changes, and the sorbent loses surface area and small pores which are the main contributors to the rapid carbonation necessary for ...

SO2 retention by reactivated CaO-based sorbent from ...

This paper examines the reactivation of spent sorbent, produced from multiple CO2 capture cycles, for use in SO2 capture. CaO-based sorbent samples were obtained from Kelly Rock limestone using three particle size ranges, each containing different impurities levels. Using a thermogravimetric analyze …

Novel synthetic sol–gel CaO based pellets using porous ...

 · During the process, the sorbent weight and temperature were monitored using Pyris software. 2.3. Characterization of the sorbents. An energy-dispersive X-ray (EDX) analyzer was used for the elemental analysis of the samples. The changes in sorbent morphology over different number of cycles were observed by scanning electron microscopy (SEM).

Optimization of the structural characteristics of CaO and ...

The cyclic CO 2 capture performance of the sorbents was evaluated in a TGA and compared to the benchmark sorbent, i.e., CaO derived from limestone. ... changes during cyclic operations ...

Spray water reactivation/pelletization of spent CaO-based ...

This paper presents a novel method for reactivation of spent CaO-based sorbents from calcium looping (CaL) cycles for CO(2) capture. A spent Cadomin limestone-derived sorbent sample from a pilot-scale fluidized bed (FBC) CaL reactor is used for reactivation. The calcined sorbent is sprayed by water in a pelletization vessel.

Full Length Research Paper Microstructure ...

The micro morphology of limestone sorbent is a key for improving the SO 2 removal efficiency in the coal-fired power plant. The tube furnace system was built for imitating the indirect desulfurization reaction in traditional boiler atmosphere (65%N 2, 15%CO 2, 4.7%O 2, 15%H 2 O, 0.3%SO 2) and the direct

(PDF) Parametric Study on the CO 2 Capture Capacity of CaO ...

Introduction The chemistry of the process is simple, and it is based on the carbonation reaction: CaO-based sorbents, in particular lime (CaO) produced from limestone, have been intensively investigated as sorbents for CaO(s) + CO2(g) f CaCO3(s) ∆H < 0 (1) CO2 capture during the last several years.

Steam Hydration Reactivation of CaO-Based Sorbent in ...

The morphology changes of spent sorbent after calcination under various conditions were observed by a scanning electron microscope. The results revealed that the reactivity and durability of the spent sorbent is significantly recovered by separate hydration after calcination.

Surface and Bulk Carbonate Formation in Calcium Oxide ...

Surface and Bulk Carbonate Formation in Calcium Oxide during CO 2 Capture Dr David Vega-Maza ... sorbent deactivation related to morphological and reactivity changes. CaO molar conversion decays to ... (Borgwardt, 1989) and provides a stable porous sorbent morphology when compared to calcination without steam (Donat et al., 2012). ...

(PDF) The effects of limestone type on the sulphur capture ...

The heat of hydration for fully calcined dolomite is 880 kJ/kg of CaO AE MgO [12]. This is low compared to 1138 kJ/kg reported for CaO [16]. SEM analysisThe surface morphology of the sorbent material in its raw form, after calcination, after hydration, and after the SO 2 capture was studied through SEM.