Direct and continuous conversion of flue gas CO2 into green fuels using dual function materials in a circulating fluidized bed system

Kosaka, Fumihiko; Sasayama, Tomone; Liu, Yanyong; Chen, Shih‐Yuan; Mochizuki, Takehisa; Matsuoka, Koichi; Urakawa, Atsushi; Kuramoto, Koji

doi:10.1016/j.cej.2022.138055

Cited by 37 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar conclusion has been reached by Bermejo-Lopez et al, namely, that Na 2 CO 3 dispersed over Al 2 O 3 can more effectively bind CO 2 at this mid-temperature range. They also attempted to shed light on the CO 2 adsorption chemistry over Na 2 CO 3 /Al 2 O 3 , which involves Na 2 CO 3 , Na 2 O, NaOH, and possibly NaHCO 3 species. , In general, the basic strength of metal oxides/carbonates tends to increase as we move down the group in the periodic table. The fact that this trend is not followed here can be attributed to the contribution of the Al 2 O 3 support in the formation of active CO 2 -philic sites for the adsorption process.…”

Section: Resultsmentioning

confidence: 99%

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Tsiotsias,

Georgiadis,

Charisiou

et al. 2024

ACS Omega

View full text Add to dashboard Cite

CO 2 adsorbents comprising various alkaline sorption active phases supported on mesoporous Al 2 O 3 were prepared. The materials were tested regarding their CO 2 adsorption behavior in the mid-temperature range, i.e., around 300 °C, as well as characterized via XRD, N 2 physisorption, CO 2 -TPD and TEM. It was found that the Na 2 O sorption active phase supported on Al 2 O 3 (originated following NaNO 3 impregnation) led to the highest CO 2 adsorption capacity due to the presence of CO 2 -philic interfacial Al−O − −Na + sites, and the optimum active phase load was shown to be 12 wt % (0.22 Na/Al molar ratio). Additional adsorbents were prepared by dispersing Na 2 O over different metal oxide supports (ZrO 2 , TiO 2 , CeO 2 and SiO 2 ), showing an inferior performance than that of Na 2 O/Al 2 O 3 . The kinetics and thermodynamics of CO 2 adsorption were also investigated at various temperatures, showing that CO 2 adsorption over the best-performing Na 2 O/Al 2 O 3 material is exothermic and follows the Avrami model, while tests under varying CO 2 partial pressures revealed that the Langmuir isotherm best fits the adsorption data. Lastly, Na 2 O/Al 2 O 3 was tested under multiple CO 2 adsorption−desorption cycles at 300 and 500 °C, respectively. The material was found to maintain its CO 2 adsorption capacity with no detrimental effects on its nanostructure, porosity and surface basic sites, thereby rendering it suitable as a reversible CO 2 chemisorbent or as a support for the preparation of dual-function materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Tsiotsias,

Georgiadis,

Charisiou

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“… 4 Monoliths already play a key role in steady-state catalytic pollution control applications, like the NOx, and can be applied to DFMs in order to process large quantities of gas (especially for DAC applications) with minimal pressure drop. Microchannel reactors 120 and fluidized bed reactors 121 are also alternatives.…”

Section: Dual-function Materialsmentioning

confidence: 99%

The Need for Flexible Chemical Synthesis and How Dual-Function Materials Can Pave the Way

et al. 2023

View full text Add to dashboard Cite

Since climate change keeps escalating, it is imperative that the increasing CO 2 emissions be combated. Over recent years, research efforts have been aiming for the design and optimization of materials for CO 2 capture and conversion to enable a circular economy. The uncertainties in the energy sector and the variations in supply and demand place an additional burden on the commercialization and implementation of these carbon capture and utilization technologies. Therefore, the scientific community needs to think out of the box if it is to find solutions to mitigate the effects of climate change. Flexible chemical synthesis can pave the way for tackling market uncertainties. The materials for flexible chemical synthesis function under a dynamic operation, and thus, they need to be studied as such. Dual-function materials are an emerging group of dynamic catalytic materials that integrate the CO 2 capture and conversion steps. Hence, they can be used to allow some flexibility in the production of chemicals as a response to the changing energy sector. This Perspective highlights the necessity of flexible chemical synthesis by focusing on understanding the catalytic characteristics under a dynamic operation and by discussing the requirements for the optimization of materials at the nanoscale.

show abstract

“…Kosaka et al 29 discussed carbon capture and utilization technologies, which require energy‐intensive processes of CO 2 capture and separation before CO 2 catalytic conversion. In contrast, carbon capture and recycling (CCR) technologies using dual‐functional materials directly convert low‐concentration CO 2 in the flue gas or atmosphere to CH 4 or CO.…”

Section: Literature Reviewmentioning

confidence: 99%

Optimizing carbon capture efficiency with direct capturing and amine: Insights from exegetic analysis

Majnoon,

Moosavian,

Hajinezhad

2023

Energy Science & Engineering

View full text Add to dashboard Cite

With climate change concerns on the rise, finding efficient and sustainable ways to separate carbon dioxide from industrial gas mixtures has become increasingly important. Membrane‐based gas separation technologies offer a promising solution due to their low energy consumption, low emissions, and ease of operation. In this study, we dug deep into theoretical energy consumption and practical optimization strategies for CO2 separation using such technologies. Our results showed that CO2 separation can be achieved with relatively low specific energy consumption, ranging from 0.09 to 0.27 MJe/kg CO2, depending on feed CO2 concentration. By conducting process simulations, we determined the optimal feed gas pressure and membrane surface area required to achieve a CO2 absorption ratio of 90% (mol). We also analyzed the effects of CO2 permeation and selectivity on energy consumption and membrane area, revealing that increasing both can significantly reduce energy consumption, albeit with more membrane surface area required. Using seepage flow circulation was found to be a particularly effective way to improve feed CO2 concentration and reduce energy consumption. To optimize and improve the capturing process, we conducted exergy analysis in each of the five stages of optimization, reporting Cooling Utilities (MW), Heating Utilities (MW), and Total Utilities (MW) for each step. Our results showed that in the optimal mode, Total Utilities (MW) were reported as 228.1, highlighting the potential of membrane‐based CO2 separation for carbon capture and storage applications. This study provides valuable insights and practical strategies for achieving efficient and sustainable CO2 separation.

show abstract

Direct and continuous conversion of flue gas CO2 into green fuels using dual function materials in a circulating fluidized bed system

Cited by 37 publications

References 29 publications

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

The Need for Flexible Chemical Synthesis and How Dual-Function Materials Can Pave the Way

Optimizing carbon capture efficiency with direct capturing and amine: Insights from exegetic analysis

Contact Info

Product

Resources

About

Direct and continuous conversion of flue gas CO2 into green fuels using dual function materials in a circulating fluidized bed system

Cited by 37 publications

References 29 publications

Mid-temperature CO2 Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al2O3

Mid-temperature CO2 Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al2O3

The Need for Flexible Chemical Synthesis and How Dual-Function Materials Can Pave the Way

Optimizing carbon capture efficiency with direct capturing and amine: Insights from exegetic analysis

Contact Info

Product

Resources

About

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃