Global climate change resulting from the emission of greenhouse gases has become a widespread concern in the recent years. Carbon dioxide alone contributes roughly two-thirds to the enhanced greenhouse effect. Carbon capture and storage (CCS), an approach for mitigating potential global climate change, is widely known as a selected track towards sustainable application of fossil fuels. Technologies to separate and compress CO 2 from power plant flue gases are commercially available. Absorption, using monoethanolamine (MEA), is the most common technology applied to capture CO 2 from flue gas of fossil fuel power plants. However, the efficiency penalty induced by carbon capture within energy conversion systems poses a threat to the economic viability of these systems. The adsorption technology due to the ability to operate at moderate temperature and pressure, the increase of the capacity of CO 2 adsorption and the compliance with the environmental safety are the trickiest in the adsorbent design. The primary objective of this work was to design an adsorbent with ability of adsorbing large quantity CO 2 at efficient energy. A long chain polymer was grafted with a diamine to provide a large CO 2 anchoring site for carbamate formation, covering multiwalled carbon nanotubes (MWNTs) to enhance the surface area and pore volume. Thus, an advanced adsorbent was made after polycondensation of aspartic acid between 190°C-210°C in phosphoric acid medium and the use of dicyclohexylcarbodiimide (DCC) as the coupling agent; this resulted in long chain polysuccinimide (PSI) synthesis. A ethylenediamine (EDA) was grafted to the PSI to give a polyaspartamide (PAA), which, covering the MWNTs, has achieved an adsorbent with 100% EDA incorporation as showed 1 H NMR. The chemical surface of the PAA-MWNTs showed with FTIR analysis the primary amine group and the amide group as CO 2 anchoring sites and biodegradable bonds respectively. As evaluated via BET, the low surface area and pore volume of PAA have increased by 31 and 41 times respectively with the inclusion of MWNTs (8nm). Thus, the surface area, pore volume, and pore size of the synthesized adsorbent (PAA-MWNTs) were 60.4m 2 /g, 0.4cm 3 / respectively. Transmission electron microscope (TEM) analysis and the decrease of graphitized carbon as shown with Raman spectra have shown that the covering of MWNTs by the polymer PAA increased the diameter size from 8nm 2 adsorption using PAA-MWNTs as an adsorbent. The CO 2 th the use of TGA in order to evaluate the CO 2 adsorption capacity of the 2231 adsorbents. The PAA-MWNTs showed a higher CO 2 adsorption capacity of 70gCO 2 /kg compared to PAA, PSI, and MWNTs alone, where the adsorption capacity showed 46.17gCO 2 /kg, 26.90gCO 2 /kg, and 15.20gCO 2 /kg respectively.

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As a preliminary investigation towards obtaining carbon nanotube composite adsorbent for CO 2 capture, in this study CO 2 adsorption performance of three commercial carbon nanotubes (CNTs) one single-walled carbon nanotubes (SWCNTs), and two (2) different multi-walled carbon nanotubes (referred to as A-MWCNTs and B-MWCNTs) were evaluated and compared. The purpose of this study was to compare the different types of CNTs and select the best to serve as the solid anchor in the development of a hydrophobic composite adsorbent material for CO 2 capture. The N 2 physisorption of the CNTs was conducted to determine their surface area, pore volume and pore size. In addition, morphology and purity of the CNTs were checked with Transmission Electron Microscopy and Raman Spectroscopy, respectively. The CO 2 adsorption capacity of the CNTs was evaluated using Thermo-gravimetric analysis (TGA) at 1.1 bar, at operating temperature ranged from 25 to 55°C and at different CO 2 feed flow rates, in order to evaluate the effects of these variables on the CO 2 adsorption capacity. The results of CO 2 adsorption with the TGA show that CO 2 adsorption capacity for both SWCNTs and MWCNTs was the highest at 25°C. Changing the CO 2 flowrates had no significant effect on the adsorption capacity of MWCNTs, but decreasing the CO 2 flow rate resulted in the enhancement of the CO 2 adsorption capacity of SWCNTs. Overall, it was found that the SWCNTs displayed the highest CO 2 adsorption capacity (29.97 gCO 2 /kg adsorbent) when compared to the MWCNTs (12.09 gCO 2 /kg adsorbent), indicating a 150% increase in adsorption capacity over MWCNTs.