Modification of Porous Materials by Saturated Fatty Amine as CO2 Capturer

Abstract

the common porous materials being used as CO 2 capturer. In this work, saturated fatty amine (octadecylamie,ODA) was evaluated as a potential source of basic sites for CO 2 capture. Both commercial SiO 2 and AC were used as preliminary supports in order to study the effect of loading. The amine-modified samples were characterized using x-ray diffractometer (XRD), attenuated total reflextance/fourier transform infrared spectroscopy (ATR/FTIR), and Brunauer-Emmet-Teller (BET). Reactivity of solid sorbents towards CO 2 was evaluated using isothermal CO 2 adsorption by BET technique. This study shows that the order of CO 2 adsorption capacity by SiO 2 type adsorbents are 25 ODA/SiO 2 > SiO 2 > 15 ODA/SiO 2 > 5 ODA/SiO 2 whereas AC > 5 ODA/AC > 15 ODA/AC > 25 ODA/AC for AC type adsorbents. However, the promotion of ODA compounds on the AC was not improving the CO 2 uptake significantly due to pore blockage and drastic reduction in microporous surface area and pore volume of AC.Index Terms-Adsorption, amine impregnation, CO 2 capture. I. INTRODUCTIONCarbon dioxide is one of green house gases, known as main anthropogenic contributors to climate change which has drawn significant attention to researchers in looking to develop strategies for reducing the CO 2 emissions and concentration. Increasing concentration of CO 2 contributes to global warming and climate changes that give critical effects to environment, infrastructures and human. There were several works reported in reducing CO 2 concentration by capture and separate the CO 2 gas. There are different unit operations such as liquid absorption, cryogenic techniques [6], and selective diffusion through polymer, metallic or ceramic membranes [7].The development of solid sorbents has focused on the modification of solid surfaces with usually having amine compounds. The solid sorbents should have a porous structure to be filled with amine compounds to enable the retention of CO 2 molecules. The commonly used porous solid supports are silica fume [8] [12], and hydrotalcyte [13]. However, application of solid sorbents together with octadecylamine (ODA) as CO 2 capturer is still limited. Selected porous materials for this study are silica dioxide (SiO 2 ) and activated carbon (AC). SiO 2 and AC surfaces will be modified with ODA compounds by impregnation method to develop high dispersion of amine and thus will give better CO 2 adsorption performance. Hence, the objective of this study is to characterize and explore the effect of ODA compounds supported on the surface of SiO 2 and AC towards CO 2 adsorption capacity. II. PROCEDURES AND METHODSSilica-amine adsorbent was prepared by use of wet impregnation. Firstly, commercial silica dioxide, SiO 2 received from Fluka was calcined at 400 °C for 4 hours in air before impregnated with octadecylamine, ODA (ALDRICH ® , 97%). Chloroform, CHCl 3 (SYSTERM ® , 99-99.4%) was added to dissolve the ODA. After stirring for 4 hours in a close system, the mixture was rested for 1 hour before sonicate (S 4000-010 Sonicator 4000). The mixtu...

Carbon Dioxide Sorption by Tetradecylamine Supported on Silica Gel

“…Meanwhile, capacity of physisorption was reduced gradually with increasing percent of TDA. This clarified as amine was loaded onto SG, the pores of SG are filled with amine layers hence increasing the steric hindrance for physisorption of CO 2 to occur and more CO 2 affinity sites were exposed for chemisorption to take place [14]. Thus, it is suggested that the higher sorption of CO 2 on modified SG also due to more chemisorption process occurred in the internal channels and external surfaces (CO 2 -TDA chemical interaction/reaction).…”