Influence of CO2 gas on the rate and kinetics of HCl, SO2, and NO2 gas removal by Mg-Al layered double hydroxide intercalated with CO32−

Tomohito Kameda, Hiroki Uchida, Shogo Kumagai, Yuko Saito, Keiichi Mizushina, Ichirou Itou, Tianye Han, Toshiaki Yoshioka

Research output: Contribution to journalArticle

Abstract

This study investigates the influence of CO2 gas on the treatment of single acidic gases (HCl, SO2, and NO2) using Mg[sbnd]Al layered double hydroxide intercalated with CO32− (CO3·Mg-Al LDH) as the adsorbent. The gas-removal kinetics is analyzed, and the reaction mechanisms are discussed. The coexisting CO2 gas decreased the removal rate of all three acidic gases. This is likely due to the exchange reaction between intercalated CO32− and gas-phase CO2, which inhibits the exchange between intercalated CO32− and HCl, SO2, or NO2. The HCl removal by CO3·Mg-Al LDH follows pseudo first order kinetics, suggesting that the main removal mechanism is chemisorption (chemical reaction between CO3·Mg-Al LDH and HCl). Meanwhile, the removal of SO2 and NO2 by CO3·Mg-Al LDH also follows pseudo first order kinetics. However, the corresponding adsorption mechanisms are classified as physisorption onto the Mg[sbnd]Al LDH.

Original languageEnglish
Article number105725
JournalApplied Clay Science
Volume195
DOIs
Publication statusPublished - 2020 Sep 15

Keywords

  • Acidic gases
  • Adsorption
  • CO
  • CO·Mg-Al layered double hydroxide
  • Gas removal
  • Gas-removal kinetics

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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