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<p>Hydrogen production through steam methane reforming or gasification produces syngas (composed mainly of H₂, CO, CO₂, and N₂). The separation of these gases can be achieved through adsorptive separation processes using suitable adsorbent materials such as zeolites and geopolymers. This study examines the CO₂, CO, and H₂ adsorption performance of commercial zeolite 13X and a geopolymer synthesized from phosphate waste and kaolin. Equilibrium adsorption isotherms for pure gases (CO₂, CO, or H₂) were measured at 30, 50, and 100 ºC. Additionally, comprehensive characterization was conducted using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance (NMR), BET surface area analysis, and porosity assessment. The phosphate waste-based geopolymer exhibited a CO₂ adsorption capacity of 3.41&#xa0;mmol/g, and thereof zeolite 13X was 3.94&#xa0;mmol/g at 30 ºC and 760&#xa0;mmHg, with minimal H₂ adsorption. BET surface area analysis revealed values of 574 m<sup>2</sup>/g for the geopolymer and 629 m<sup>2</sup>/g for zeolite 13X, with corresponding pore volume values of 0.173 and 0.207 cm<sup>3</sup>/g. Furthermore, FTIR and NMR analyses confirmed the completion of the geopolymer reaction and identified characteristic aluminosilicate peaks. These findings highlight the potential of industrial waste geopolymers as cost-effective and sustainable adsorbents for CO₂ separation.</p>

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Comparative Study on CO₂ Adsorption Capacity of Phosphate Waste-Based Geopolymer and Zeolite 13X for Sustainable Hydrogen Purification

  • 期刊论文

  • 发表日期：

    2025年5月3日

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  • Mariana Schneider,
  • Denise Gomes da Silva Costa,
  • Alisson Lopes Freire,
  • Enrique Rodríguez-Castellón,
  • Maria Olga Guerrero-Pérez,
  • Dachamir Hotza,
  • Agenor De Noni Junior,
  • Regina de Fátima Peralta Muniz Moreira

摘要

Hydrogen production through steam methane reforming or gasification produces syngas (composed mainly of H₂, CO, CO₂, and N₂). The separation of these gases can be achieved through adsorptive separation processes using suitable adsorbent materials such as zeolites and geopolymers. This study examines the CO₂, CO, and H₂ adsorption performance of commercial zeolite 13X and a geopolymer synthesized from phosphate waste and kaolin. Equilibrium adsorption isotherms for pure gases (CO₂, CO, or H₂) were measured at 30, 50, and 100 ºC. Additionally, comprehensive characterization was conducted using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance (NMR), BET surface area analysis, and porosity assessment. The phosphate waste-based geopolymer exhibited a CO₂ adsorption capacity of 3.41 mmol/g, and thereof zeolite 13X was 3.94 mmol/g at 30 ºC and 760 mmHg, with minimal H₂ adsorption. BET surface area analysis revealed values of 574 m2/g for the geopolymer and 629 m2/g for zeolite 13X, with corresponding pore volume values of 0.173 and 0.207 cm3/g. Furthermore, FTIR and NMR analyses confirmed the completion of the geopolymer reaction and identified characteristic aluminosilicate peaks. These findings highlight the potential of industrial waste geopolymers as cost-effective and sustainable adsorbents for CO₂ separation.