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Preparation and CO2 adsorption performance of CGCS based zeolite molecular sieves

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  • Zhang, Duo
  • Du, Yang
  • Wen, Hu
  • Liu, Chun
  • Deng, Jun

Abstract

In order to cope with the environmental problems caused by the accumulation of Coal Gasification Slag (CGS), and to achieve its high value utilization and carbon neutrality. Coal Gasification Coarse Slag (CGCS) produced by the coal-to-oil process was used as the raw material, and after pre-treatment by high temperature calcination and acid leaching, the alkali-melting-hydrothermal synthesis method was adopted to prepare CGCS-based 4A-type zeolite molecular sieves and test their CO2 adsorption performance. The results showed that the ash-base ratio of 1:1.5, the aluminium-silicon ratio of 1:1.2, the crystallization temperature of 80 °C and the crystallization time of 8 h were the optimal synthesis parameters for the CGCS-based 4A zeolite molecular sieves, and the specific surface area of 47.6153 m2/g, the pore volume of 0.1741 cm3/g, and the average pore size of 8.2648 nm were obtained by adsorption profiling experiments. The maximum adsorption amount of CO2 of CGCS-based A-type zeolite molecular sieve at 25 °C was 67.80 cm3/g; the adsorption index after 5 adsorption analysis cycles was 90.3 %, which is still with high adsorption property. It provides the feasibility for the high value-added use of coal gasification slag and CO2 adsorption and storage.

Suggested Citation

  • Zhang, Duo & Du, Yang & Wen, Hu & Liu, Chun & Deng, Jun, 2025. "Preparation and CO2 adsorption performance of CGCS based zeolite molecular sieves," Energy, Elsevier, vol. 330(C).
    • Handle: RePEc:eee:energy:v:330:y:2025:i:c:s0360544225026428
    DOI: 10.1016/j.energy.2025.137000
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