Scholarlink

<p>Capturing, harnessing, and securely storing carbon dioxide (CO<sub>2</sub>) are pivotal strategies for achieving lasting reductions in CO<sub>2</sub> emissions. Efficiently converting CO<sub>2</sub> into valuable products like CaCO<sub>3</sub> is a promising method for CO<sub>2</sub> mineralization in carbon capture and utilization (CCU) technologies. This study introduces an alkaline catalyst mediated (ACM) method to form CaCO<sub>3</sub> at basic pH under ambient conditions, facilitating carbonate ion (HCO<sub>3</sub><sup>−</sup> &amp; CO<sub>3</sub><sup>2−</sup>) interaction with calcium ions from CaCl<sub>2</sub> to precipitate calcium carbonate. Alkaline solutions prepared using Tris base, NaOH, KOH, and EtNH<sub>2</sub> were compared for their efficacy in converting CO<sub>2</sub> to CaCO<sub>3</sub>. Results indicate that the Cu-BTC-MOF catalyst boosts efficiency in NaOH solution showing the highest CaCO<sub>3</sub> yield (93.98%) and accelerated reaction rate with R<sup>2</sup> = 0.99692, following pseudo-second-order kinetics. The rate constant (K) for the alkaline catalyst mediated (ACM) system is 0.5082&#xa0;min<sup>−1</sup> which is higher by a factor of 1.376 and 1947.147 as compared to the rate constant (K) of 0.3692 and 0.000261 for CO<sub>2</sub> mineralisation in control systems without catalyst alkaline mediated system and blank system respectively. The CO<sub>2</sub> sequestration capacity of (ACM) system is 2210&#xa0;mg/g, which is higher by a factor of 1.2923 as compared to CO<sub>2</sub> mineralisation in the control system of the “no catalyst” alkaline mediated system. The study elucidates CO<sub>2</sub> mineralization mechanisms and parameters crucial for CCUS.</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

Catalyst-Mediated Efficient Sequestration of Gaseous CO2 to Solid CaCO3

  • 期刊论文

  • 发表日期：

    2025年4月28日

查看全文
  • Vaishnavi Palwe,
  • Uktika Panbude,
  • Shubham Tembhare,
  • Karthik Raghunathan,
  • Damodar Y. Maskare,
  • Sadhana Rayalu,
  • Penumaka Nagababu

摘要

Capturing, harnessing, and securely storing carbon dioxide (CO2) are pivotal strategies for achieving lasting reductions in CO2 emissions. Efficiently converting CO2 into valuable products like CaCO3 is a promising method for CO2 mineralization in carbon capture and utilization (CCU) technologies. This study introduces an alkaline catalyst mediated (ACM) method to form CaCO3 at basic pH under ambient conditions, facilitating carbonate ion (HCO3− & CO32−) interaction with calcium ions from CaCl2 to precipitate calcium carbonate. Alkaline solutions prepared using Tris base, NaOH, KOH, and EtNH2 were compared for their efficacy in converting CO2 to CaCO3. Results indicate that the Cu-BTC-MOF catalyst boosts efficiency in NaOH solution showing the highest CaCO3 yield (93.98%) and accelerated reaction rate with R2 = 0.99692, following pseudo-second-order kinetics. The rate constant (K) for the alkaline catalyst mediated (ACM) system is 0.5082 min−1 which is higher by a factor of 1.376 and 1947.147 as compared to the rate constant (K) of 0.3692 and 0.000261 for CO2 mineralisation in control systems without catalyst alkaline mediated system and blank system respectively. The CO2 sequestration capacity of (ACM) system is 2210 mg/g, which is higher by a factor of 1.2923 as compared to CO2 mineralisation in the control system of the “no catalyst” alkaline mediated system. The study elucidates CO2 mineralization mechanisms and parameters crucial for CCUS.