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<p>The present study investigated the equilibrium and kinetics of nitric oxide (NO) and nitrous oxide (N<sub>2</sub>O) adsorption at different temperatures on natural erionite from Agua Prieta, Sonora, Mexico (ZAPS), modified by ion exchange with Fe<sup>2+</sup>, Co<sup>2+</sup>, and Cu<sup>2+</sup>. UV–Vis diffuse reflectance, energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and Mössbauer spectroscopy were used to characterize the exchanged samples. The Freundlich, Langmuir, and Brunauer–Emmett–Teller (BET) models were employed to analyze the adsorption data. The isotherms of N<sub>2</sub>O and NO adsorption in the exchanged samples at the same temperature and at low equilibrium pressures showed that the adsorbed amount and irreversibility grade decrease in the order: ZAPS-Co &gt; ZAPS-Fe &gt; ZAPS-Cu, which was attributed to the increasing acidity of the cations. At high equilibrium pressures, the NO adsorption capacity changed in order due to the increased pore volume resulting from the exchange of smaller cations. At equilibrium, the ZAPS-Fe and ZAPS-Cu samples exhibited the best performance for separating NO/N<sub>2</sub>O mixtures at high temperatures and low concentrations, whereas for high concentrations, the ZAPS-Cu sample was the most effective for separation This result indicated that upon contact with the ZAPS-Cu catalyst, the NO/N<sub>2</sub>O mixture undergoes selective adsorption of NO, resulting in an increase in the relative concentration of N<sub>2</sub>O in the gas phase. Under non-equilibrium conditions at low temperatures, for the separation of N<sub>2</sub>O-NO mixtures, the N<sub>2</sub>O was adsorbed more rapidly than NO.</p>

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Adsorption equilibria and kinetics of NO and N2O on natural erionite exchanged with Fe, Co, and Cu

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Mayra Sánchez-Cruz,
  • Rosario Hernández-Huesca,
  • M. Ana Pérez-Cruz,
  • Eric Aguilar-García,
  • Hernani. Yee-Madeira,
  • Rosalía Torralba-Sánchez,
  • Diana Vargas Hernández,
  • D. Judith Caballero-Jiménez

摘要

The present study investigated the equilibrium and kinetics of nitric oxide (NO) and nitrous oxide (N2O) adsorption at different temperatures on natural erionite from Agua Prieta, Sonora, Mexico (ZAPS), modified by ion exchange with Fe2+, Co2+, and Cu2+. UV–Vis diffuse reflectance, energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and Mössbauer spectroscopy were used to characterize the exchanged samples. The Freundlich, Langmuir, and Brunauer–Emmett–Teller (BET) models were employed to analyze the adsorption data. The isotherms of N2O and NO adsorption in the exchanged samples at the same temperature and at low equilibrium pressures showed that the adsorbed amount and irreversibility grade decrease in the order: ZAPS-Co > ZAPS-Fe > ZAPS-Cu, which was attributed to the increasing acidity of the cations. At high equilibrium pressures, the NO adsorption capacity changed in order due to the increased pore volume resulting from the exchange of smaller cations. At equilibrium, the ZAPS-Fe and ZAPS-Cu samples exhibited the best performance for separating NO/N2O mixtures at high temperatures and low concentrations, whereas for high concentrations, the ZAPS-Cu sample was the most effective for separation This result indicated that upon contact with the ZAPS-Cu catalyst, the NO/N2O mixture undergoes selective adsorption of NO, resulting in an increase in the relative concentration of N2O in the gas phase. Under non-equilibrium conditions at low temperatures, for the separation of N2O-NO mixtures, the N2O was adsorbed more rapidly than NO.