Scholarlink

<p>CO<sub>2</sub> emissions have raised alerts worldwide due to their contribution to global warming. Thus, many efforts have been made to develop technologies to capture CO<sub>2</sub> from the atmosphere and interest in utilizing adsorbents originating from natural raw sources increasing sustainability. In this work, Zeolite-A was synthesized from Kaolin material. Kaolin was previously calcined at 650&#xa0;°C to form the Metakaolin. The obtained Metakaolin was submitted to hydrothermal treatment in an aqueous solution of sodium hydroxide and treated at 60&#xa0;°C for 24&#xa0;h without using other sources of silica and alumina species. The materials were characterized by X-ray diffraction (XRD), <sup>27</sup>Al NMR, infrared spectroscopy (FTIR), N<sub>2</sub>-physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The synthesized Zeolite-A material was evaluated in the CO<sub>2</sub> adsorption on a fixed bed reactor using a continuous flow system. The Yoon–Nelson model was used to predict the breakthrough behavior of CO<sub>2</sub> adsorption in a fixed bed reactor using Zeolite-A material as an adsorbent. The role of pretreatment temperature of Zeolite-A prior to the CO<sub>2</sub> adsorption capacity was accessed. Three different pre-treatment temperatures were used: 100&#xa0;°C, 300&#xa0;°C, and 400&#xa0;°C. The Zeolite-A pretreated at 400&#xa0;°C (Zeolite-A-400) exhibited the highest surface area. The CO<sub>2</sub> adsorption kinetics of the Zeolite-A materials indicated a pseudo-first-order (PFO) kinetics suggesting physical adsorption of CO<sub>2</sub> species on the Zeolite materials along with an intraparticle diffusion as the rate-controlling step of the whole adsorption process. The Yoon–Nelson rate constant (k<sub>YN</sub>) values and the time (τ) required for 50% adsorbate breakthrough offered pieces of evidence for the rationalization of the superior adsorption capacity noticed for the Zeolite-A-400 sample.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Room-Temperature CO2 Capture by a Zeolite-A Synthesized from Kaolin

  • 期刊论文

  • 发表日期：

    2025年5月28日

查看全文
  • Ricardo José Chimentão,
  • Analio Dugarte-Dugarte,
  • Julio Colmenares-Zerpa,
  • Doris Ruiz

摘要

CO2 emissions have raised alerts worldwide due to their contribution to global warming. Thus, many efforts have been made to develop technologies to capture CO2 from the atmosphere and interest in utilizing adsorbents originating from natural raw sources increasing sustainability. In this work, Zeolite-A was synthesized from Kaolin material. Kaolin was previously calcined at 650 °C to form the Metakaolin. The obtained Metakaolin was submitted to hydrothermal treatment in an aqueous solution of sodium hydroxide and treated at 60 °C for 24 h without using other sources of silica and alumina species. The materials were characterized by X-ray diffraction (XRD), 27Al NMR, infrared spectroscopy (FTIR), N2-physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The synthesized Zeolite-A material was evaluated in the CO2 adsorption on a fixed bed reactor using a continuous flow system. The Yoon–Nelson model was used to predict the breakthrough behavior of CO2 adsorption in a fixed bed reactor using Zeolite-A material as an adsorbent. The role of pretreatment temperature of Zeolite-A prior to the CO2 adsorption capacity was accessed. Three different pre-treatment temperatures were used: 100 °C, 300 °C, and 400 °C. The Zeolite-A pretreated at 400 °C (Zeolite-A-400) exhibited the highest surface area. The CO2 adsorption kinetics of the Zeolite-A materials indicated a pseudo-first-order (PFO) kinetics suggesting physical adsorption of CO2 species on the Zeolite materials along with an intraparticle diffusion as the rate-controlling step of the whole adsorption process. The Yoon–Nelson rate constant (kYN) values and the time (τ) required for 50% adsorbate breakthrough offered pieces of evidence for the rationalization of the superior adsorption capacity noticed for the Zeolite-A-400 sample.

Graphical Abstract