In Situ IR Study on Effect of Alkyl Chain Length between Amines on Its Stability against Acidic Gases

• Main Authors: Rose Mardie Pacia, Clinton Manianglung, Young Soo Ko
• Format: Article
• Language: English
• Published: MDPI AG 2019-10-01
• Series: Catalysts
• Subjects: co₂ capture; catalytic amines; diaminosilane; propyl spacer; acidic gas; degradation; in situ ir
• Online Access: https://www.mdpi.com/2073-4344/9/11/910

For the CO₂ capture process via the cyclic adsorption/desorption method, one emerging catalyst is the use of amine-functionalized silica. This study focused on comparing the CO₂ capture performance of diamines with ethyl and propyl spacers and the degradation species formed after long-term exposure to various acidic gases such as SO₂ and NO₂ at elevated temperatures. Adsorbents were prepared via the incipient wetness technique and then subjected to thermogravimetric measurements and in situ FT-IR analyses. 2NS-P/Kona95, which contains a propyl spacer, showed fewer degradation species formed based on its IR spectra and better stability with its long-term exposure to various acidic gases. Thus, the incorporation of amines with a large number of nitrogen groups of propyl or longer spacer length could be a promising CO₂ capture material.