Characterization and evaluation of synthetic Dawsonites as CO2 sorbents

Lundvall, Fredrik; Kalantzopoulos, Georgios N.; Wragg, David S.; Arstad, Bjørnar; Blom, Richard; Sjåstad, Anja Olafsen; Fjellvåg, Helmer

doi:10.1016/j.fuel.2018.09.057

Cited by 11 publications

(6 citation statements)

References 39 publications

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“…In situ XRD can also give insight into specific structural evolution during carbonation. Lundvall et al 584 These studies demonstrate that in situ XRD can provide information complementary to that of more commonly used techniques such as TGA and provide insights that would not be possible without its use.…”

Section: In Situ Experimental Methods For New Mechanistic Insightsmentioning

confidence: 99%

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CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

et al. 2021

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Carbon dioxide capture and mitigation form a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, with promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at medium to high temperature: how their structure, chemical composition, and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines, including materials discovery, synthesis, and in situ characterization, to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.

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Section: In Situ Experimental Methods For New Mechanistic Insightsmentioning

confidence: 99%

“…In situ XRD can also give insight into specific structural evolution during carbonation. Lundvall et al . employed the technique to monitor CO 2 absorption by Dawsonite, NaAl(OH) 2 CO 3 , which forms a poorly crystalline intermediate phase upon carbonation at ∼280 °C.…”

Section: Mechanistic Insights Into Parameters Influencing Co2 Absorpt...mentioning

confidence: 99%

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

et al. 2021

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“…The original Al peaks should then also change intensity as well. By comparing 27 Al NMR spectra of the K-promoted Co 1.5 Mg 1.5 Al material with K–dawsonite reported in the literature, we can see a resemblance, see Supporting Information Figure S2, albeit not completely . The maxima in these samples are actually at the same chemical shift, but curve fitting including models for quadrupolar couplings has so far not given any conclusive evidence for similar phases in the two materials.…”

Section: Resultsmentioning

confidence: 67%

“…By comparing 27 Al NMR spectra of the K-promoted Co 1.5 Mg 1.5 Al material with K−dawsonite reported in the literature, we can see a resemblance, see Supporting Information Figure S2, albeit not completely. 24 The maxima in these samples are actually at the same chemical shift, but curve fitting including models for quadrupolar couplings has so far not given any conclusive evidence for similar phases in the two materials. A third possible explanation to our observation is that promotion of the base material with K decouples Al from the influence of paramagnetic Co(II).…”

mentioning

confidence: 93%

Synthesis and Evaluation of K-Promoted Co_3-xMg_xAl-Oxides as Solid CO₂ Sorbents in the Sorption-Enhanced Water−Gas Shift (SEWGS) Reaction

Arstad

Blom

Håkonsen

et al. 2020

Ind. Eng. Chem. Res.

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Hydrogen is essential in a variety of large-scale chemical processes. As a carbon-free energy carrier, hydrogen has a potential for wide use within power production and transportation. However, most of the recent production methods involve the release of CO2 as a by-product. Hence, decarbonization of hydrogen production is one step to reduce CO2 emission into the Earth’s atmosphere. Several process schemes have been suggested for low-carbon emission production of hydrogen. In this work, we show how to improve solid sorbents for the sorption-enhanced water–gas shift (SEWGS) process, which is a process that exploits a solid sorbent in the water–gas shift reactor to capture CO2 in situ and drive the process toward an improved hydrogen yield. We report herein a series of Co x Mg3‑x Al materials based on hydrotalcites, promoted with various loadings of K. The materials have been characterized by BET, XRD, and NMR and tested for their CO2 adsorption performance in three adsorption–desorption cycles in a lab-scale fixed-bed reactor (20–22 bar, CO2 + steam as reactant gas, and isothermal conditions at 375 and 400 °C). The most promising material was subjected to a long-term test (120 adsorption–desorption cycles at similar conditions). This test indicates that a K-promoted Co1.5Mg1.5Al (22 wt % of added K2CO2 to the oxide) material has a higher cyclic capacity for CO2 than standard reference cases. We have estimated that the volumetric capacity (in mol/L unit) of this sorbent will be 23–26% higher than a standard reference material at 400 °C and 30–39% higher at 375 °C. This would, in fixed-bed columns, lead to significant reduction in the needed column volumes in the final process and reduce costs.

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“…Thus, for the time being, reducing CO2 released into the atmosphere from post-combustion sources is a topic of considerable interest to scientists. [7][8][9][10] Aqueous pollution, too, is of primary relevance to the continued health of the environment. Emerging in the past two decades as a quickly growing source of pollution, waste micro-and nanoplastic particles (MPs) present a serious ecological concern.…”

Section: Introductionmentioning

confidence: 99%

Solid, aqueous, and gaseous: functional materials and advancements to reduce pollution in three forms

Siercks¹

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Growing environmental concerns require new and novel materials to combat the glut of anthropogenic pollution produced. Solid waste polymer pollution chokes the planet and, concerningly, has been found to generate a new class of pollutant in microplastics; these microplastics, and also waste pharmaceuticals and dyes, accumulate in our water with deleterious effects on animal life. Simultaneously, CO2 and other greenhouse gases threaten us with climate change causing loss of habitable land, destroyed ecosystems, and prevalent extreme weather events. For a sustainable future, pollution in all three forms must be combatted. In this dissertation, I present works related to the pursuit of this goal. In all cases, I have striven to produce research and materials that are creative and multifunctional. In as much as possible, I have given thought to the feasible real-world applicability of this work. Firstly, I have produced and characterized an extensive series of activated carbons using waste plastics in proportions that mimic those found in real world mixed plastic recycling. The carbons were activated by tube furnace pyrolysis at three different temperatures with both common and atypical activating agents. The materials were rigorously characterized and their abilities to adsorb both three aqueous compounds - a cationic dye, an anionic dye, and a neutral pharmaceutical - and gaseous CO2 were investigated. It was found that the materials were extremely diverse with materials activated with KOH and citric acid being the most performant at capturing CO2 (1.86 and 1.91 mmol CO2/g sorbent, respectively). As far as the adsorption of aqueous pharmaceuticals or dyes is concerned, the materials tested displayed differing capacities for each adsorbate that appeared mostly independent of surface area and activating agent. For cationic methylene blue (MB), Sodium Citrate-600 was the most performant, capturing a maximum of 89.59 mg/g; for anionic methyl orange (MO), Zinc Chloride-500 performed best and captured a maximum of 123.8 mg/g; for neutral tetracycline (TC), Zinc Chloride-500 was again the most effective and captured a maximum of 189.7 mg/g. Further, a series of amine-loaded silica materials were created using a variety of silica supports (SBA-15, PE-MCM-41, COK-19, HPS, and fumed silica) and one amine (Jeffamine T-403) to elucidate the most crucial support property on the overall CO2 capacity of the loaded material. Results suggest that surface area is the most important predictor of CO2 capacity for these materials. It was also found that pore expanded MCM-41 performed the best, capturing 1.81 mmol CO2/g sorbent under atmospheric pressure of 100 percent CO2 at 45 degreesC. This support was additionally co-loaded with a different -- high capacity but poorly regenerating -- amine to optimize the low temperature regeneration of the material; the resultant co-loaded material displayed the favorable regenerable capacity of 2.04 mmol CO2/g sorbent under the same conditions as above. Finally, a recently published procedure for the low-cost removal of microplastics from water using calcium carbonate co-precipitation was expanded by testing the method using common polystyrene microspheres and found to be 56.59 percent and 91.66 percent effective when using 1 µm and 25 µm spheres, respectively. To add to this method, a novel procedure exploring the use of CO2 to release captured microplastics was explored. Overall, it is my hope that these works as a whole will help pave the way for the feasible reduction of pollution in solid, aqueous, and gaseous forms.

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Characterization and evaluation of synthetic Dawsonites as CO2 sorbents

Cited by 11 publications

References 39 publications

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Synthesis and Evaluation of K-Promoted Co_3-xMg_xAl-Oxides as Solid CO₂ Sorbents in the Sorption-Enhanced Water−Gas Shift (SEWGS) Reaction

Solid, aqueous, and gaseous: functional materials and advancements to reduce pollution in three forms

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Characterization and evaluation of synthetic Dawsonites as CO2 sorbents

Cited by 11 publications

References 39 publications

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Synthesis and Evaluation of K-Promoted Co3-xMgxAl-Oxides as Solid CO2 Sorbents in the Sorption-Enhanced Water−Gas Shift (SEWGS) Reaction

Solid, aqueous, and gaseous: functional materials and advancements to reduce pollution in three forms

Contact Info

Product

Resources

About

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Synthesis and Evaluation of K-Promoted Co_3-xMg_xAl-Oxides as Solid CO₂ Sorbents in the Sorption-Enhanced Water−Gas Shift (SEWGS) Reaction