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Related Concept Videos

Sampling Methods: Sample Types01:18

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Sampling materials are classified into three main types: solid, liquid, and gas.
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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
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Direct Air Capture with Integrated Electrochemical Conversion through Combined Solid and Liquid Sorbents.

Iris A E Burgers1, Tim M J Nijssen1, Saartje Feith1

  • 1Department of Process & Energy, Faculty of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 39, Delft 2628 CB, The Netherlands.

ACS Sustainable Chemistry & Engineering
|March 6, 2026
PubMed
Summary

This study presents a novel integrated system for direct air capture and carbon dioxide conversion using solid and liquid sorbents. The system demonstrates technical feasibility for a circular carbon economy, highlighting key design trade-offs.

Keywords:
bicarbonate electrolysiscarbon capture and utilizationdirect air captureelectrochemical CO2 reductionprocess integrationsustainable syngas production

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Materials Science

Background:

  • Direct air capture (DAC) and CO2 conversion are crucial for a circular carbon economy.
  • Integrated systems offer potential for efficient CO2 utilization.

Purpose of the Study:

  • To propose and demonstrate the technical feasibility of a novel integrated CO2 capture and conversion system.
  • To investigate the effects of scaling and identify dominant design parameters.

Main Methods:

  • Utilizing an amine-functionalized solid sorbent for initial CO2 capture.
  • Regenerating the solid sorbent with an aqueous carbonate-rich solution.
  • Converting the bicarbonate-rich solution to syngas via electrolysis.

Main Results:

  • Demonstrated technical feasibility of the dual-sorbent capture and conversion system.
  • Identified pH-swing as a dominant design parameter, governed by electrolyzer sizing.
  • Revealed trade-offs between electrolyzer performance, syngas composition, sorbent efficiency, and water loss.

Conclusions:

  • The proposed integrated system is technically feasible for CO2 capture and conversion.
  • Electrolyzer sizing significantly impacts system performance through pH-swing control.
  • Fundamental trade-offs must be considered in the design of integrated capture and conversion systems.