Experimental evaluation of Mg- and Ca-based synthetic sorbents for CO2 capture

Zhenissova, A. Zh.; Micheli, F.; Rossi, Leucio; Stendardo, Stefano; Foscolo, P.U.; Gallucci, Katia

doi:10.1016/j.cherd.2013.11.005

Cited by 19 publications

(12 citation statements)

References 47 publications

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“…In the presence of water, CO 2 is hydrolyzed to form HCO 3 – and CO 3 2– , which further interact with the protonated amine to form the salts ammonium bicarbonate (RNH 3 + HCO 3 – ) and ammonium carbonate ((RNH 3 + ) 2 CO 3 2– ). As it is found that chemical adsorption plays an important role during CO 2 adsorption on modified adsorbents, the surface basicity should be the key parameter . The enhanced basicity of catalyst will lead to an increase in chemisorption of acidic carbon dioxide.…”

Section: Resultsmentioning

confidence: 99%

“…As it is found that chemical adsorption plays an important role during CO 2 adsorption on modified adsorbents, the surface basicity should be the key parameter. 25,26 The enhanced basicity of catalyst will lead to an increase in chemisorption of acidic carbon dioxide. In template-containing MCM-41, the basic sites consist of ࣕSiO − siloxyanions associated with CTA + cations.…”

Section: Hydration and Sequestration Of Comentioning

confidence: 99%

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The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration

2017

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Magnesium and nickel incorporated MCM‐41 were prepared by two approaches: direct synthesis (DS) and wet impregnation (WI). The ionic template was removed by calcination. In some experiments, the ionic template was removed by calcination process and in the others it was preserved to investigate the template effect. For comparison, MgO and NiO nanoparticles were also synthesized. The catalysts were characterized by XRD, EDX‐SEM, and FT‐IR. The catalysts obtained were evaluated for hydration of CO2 and its precipitation as CaCO3 at room temperature. The results showed that template‐containing Mg/MCM‐41 and Ni/MCM‐41 prepared by the DS approach have high CO2 hydration activity. This high activity is due to the presence of strong basic sites. Nano MgO and NiO also exhibited a high yield of CaCO3. It was also found that template‐containing MCM‐41 can be recovered easily from the reaction mixture and reused without deactivation. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Hydration and Sequestration Of Comentioning

confidence: 99%

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration

2017

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“…These compounds are characterized by a double-layered they can be used as antacids, ion exchangers and sorbents, catalysts and catalyst supports, polymer stabilizers, molecular sieves, pharmaceutical products, electrodes conducting materials [11] and cosmetics [12] and can be synthesized through different methods, depending on the properties required [13][14][15]. Literature attention has been focused especially on HTs for SEWGS processes, because they display relatively fast reversible adsorption/desorption rates, a stable capacity for CO 2 during long-term cyclic experiments, fairly good mechanical strength in high-pressure steam and no interaction with the physically mixed water gas shift catalyst.…”

Section: Introductionmentioning

confidence: 99%

CO2 Sorption by Hydrotalcite-Like Compounds in Dry and Wet Conditions

Gallucci

Micheli

Poliandri

et al. 2015

International Journal of Chemical Reactor Engineering

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A pre-combustion removal option, coupling water-gas shift and CO 2 capture is the well-known sorption-enhanced water-gas shift (SEWGS): the removal of CO 2 produced by WGS reaction, shifting the thermodynamic equilibrium, enhances H 2 production. Among the different CO 2 sorbents, hydrotalcite-like compounds work at the required intermediate temperature (T ¼ 200-400°C). Using low supersaturation method, three different sorbents were synthesized. Sieved fractions were impregnated with 20% w/w K 2 CO 3 and then dried and subjected to thermal treatment. Sample characterization was performed by means of FT-IR spectroscopy, XRD analysis and TG-DTA analysis. Sample analysis was carried out after synthesis, thermal treatment (calcination) and after fixed bed reactor capture tests. Sorption and desorption tests were performed in a fixed bed microreactor, under cyclic conditions, at temperature level of T ¼ 350°C and P ¼ 5 bar in dry and wet condition. The amount of CO 2 captured by the sorbent in each test was quantified by means of a first order with dead time flow distribution model applied to the experimental system. Sorption capacity of sorbents in dry conditions increases of 30% with respect to previous atmospheric pressure results obtained in fluidized bed. These sorbents seem to be good candidates to be used as a bi-functional sorbent-catalyst for SEWGS.

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“…Furthermore, a large number of works about novel synthetic solids suitable for Ca-Cu applications have been reported. Synthetic calcium-based sorbents (Martavaltzi et al, 2011;Valverde et al, 2012;Broda et al, 2013;Zhenissova et al, 2014), hybrid reforming catalyst-CaO materials (Martavaltzi and Lemonidou, 2010;García-Lario et al, 2015;Aloisi et al, 2017) and CaO-CuO composites (Manovic and Anthony, 2011;Kierzkowska and Müller, 2012;Rahman et al, 2015;Kazi et al, 2017) have shown a good reactivity and stable performance after multiple cycles. The feasibility of the reaction steps described in Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental testing and model validation of the calcination of calcium carbonate by the reduction of copper oxide with CH4

Fernández

Abanades

2019

Chemical Engineering Science

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The reduction reaction of copper oxide with CH 4 is highly exothermic and can be arranged to generate sufficient heat to in-situ calcine calcium carbonate and produce a highly concentrated stream of CO 2. This concept is tested at TRL4 in a packed-bed reactor operated close to adiabatic conditions. The impact of the initial solids temperature and the inlet flowrate of the gases is evaluated. A 50/50 (vol.%) mixture of methane and hydrogen (i.e., a possible composition of the PSA-off gas generated in a reforming process) has also been used as reducing gas. The presence of H 2 reduces the CuO/CaCO 3 proportion required in the bed and promotes the calcination at temperatures lower than 870 ºC. The experimental measurements are well predicted by a onedimensional fixed-bed reactor model, in which the steam methane reforming, water-gasshift, carbon deposition and carbon gasification reactions are also considered. Different characterization techniques (i.e., SEM, XRD, N 2 adsorption, TPR) demonstrate that both commercial CuO-and CaO-based materials show good stability after successive cyclic experiments.

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Experimental evaluation of Mg- and Ca-based synthetic sorbents for CO2 capture

Cited by 19 publications

References 47 publications

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration

CO2 Sorption by Hydrotalcite-Like Compounds in Dry and Wet Conditions

Experimental testing and model validation of the calcination of calcium carbonate by the reduction of copper oxide with CH4

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Experimental evaluation of Mg- and Ca-based synthetic sorbents for CO2 capture

Cited by 19 publications

References 47 publications

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO2 sequestration

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO2 sequestration

CO2 Sorption by Hydrotalcite-Like Compounds in Dry and Wet Conditions

Experimental testing and model validation of the calcination of calcium carbonate by the reduction of copper oxide with CH4

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The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration

The remarkable activity of template‐containing Mg/MCM‐41 and Ni/MCM‐41 in CO₂ sequestration