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

Rose Mardie Pacia,Young Soo Ko,Clinton Manianglung

doi:10.3390/catal9110910

Abstract

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.

Highlights

A significant amount of research has been conducted on ways to mitigate the continuous increase in CO2 emissions [1]
There are three major technologies that are considered to be viable processes to address CO2 emission issues, one of which is postcombustion capture (PCC), which is a set of end-pipe technologies that appears to be a promising method of capturing CO2 from combustion process exhaust [2,3]
Several materials have been investigated as supports for preparing these organic/inorganic hybrid adsorbents, such as activated carbon, carbon nanotubes, zeolites, molecular sieves, metal–organic frameworks (MOFs), alkali metal carbonate-based solid sorbents, and amine-functionalized silica [10,11,12]

Summary

Introduction

A significant amount of research has been conducted on ways to mitigate the continuous increase in CO2 emissions [1]. Several materials have been investigated as supports for preparing these organic/inorganic hybrid adsorbents, such as activated carbon, carbon nanotubes, zeolites, molecular sieves, metal–organic frameworks (MOFs), alkali metal carbonate-based solid sorbents, and amine-functionalized silica [10,11,12]. Among these, the latter has emerged as a promising material, as it possesses a high adsorption capacity, fast adsorption kinetics, facile regeneration, and high selectivity [12,13]. One of the most widely used amines is polyethyleneimine (PEI) and diaminosilane, which contains diamine

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Conclusion