Abstract
The synthesis of mesoporous materials in macroscopic scale, as for example, the monoliths, has been of great interest in view of the wide range of applications that this material holds. Thus, this work consists of the production of silica monoliths for the purpose of they being used in the carbon dioxide (CO2) adsorption process. The adsorbents were prepared in pure form and also with addition of heteroatoms: Al, Ti and Zr. The samples were then functionalized with pentaethylenehexamine (PEHA) by the wet impregnation method. The materials were characterized by the following techniques: X-ray diffraction (XRD), textural analysis, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Thermogravimetry (TG/DTG). The analyses indicated that the materials synthesized with heteroatom incorporation presented a disordered pore structure and high surface area (1387 m2/g for sample Ti/M1). In addition, they showed a significant increase in adsorption of CO2 relative to their parent sample, a fact that is not much explored in the literature. The CO2 adsorption performance tests were carried out at 30 oC and atmospheric pressure. All functionalized materials demonstrated improved CO2 adsorption capacity relative to their starting samples. Adsorption capacities up to 111.3 mg/g were found in this work, which makes the materials developed promising candidates for the capture of CO2.
Highlights
According to the IPCC 1, the carbon capture and storage (CCS) technology is one of the options, among the mitigation actions, that most contributes to the equilibrium of the levels of anthropogenic greenhouse gases in the atmosphere
The energy dispersive X-ray spectrometry (EDS) analysis confirmed the presence of the metal heteroatoms in the composition of the chemical elements present in the samples, ratifying the results obtained by the Fourier transform infrared spectroscopy (FTIR) analysis
The presence of these peaks was described by Liu et al 42, who synthesized the material MCM-41 impregnated with PEHA and Ji et al 55, which have developed a porous silica material supported with PEHA
Summary
According to the IPCC 1, the carbon capture and storage (CCS) technology is one of the options, among the mitigation actions, that most contributes to the equilibrium of the levels of anthropogenic greenhouse gases in the atmosphere. The most used technique currently in the separation of CO2 from a gas mixture is the absorption using amines It is effective for its purpose, it presents some disadvantages due to the high energy cost for solution regeneration and oxidative degradation. Different adsorbent materials are currently under study for the CO2 capture process, among them are mesoporous silicas 9 This material can be synthesized in the form of powders , 10,11 films , 12,13 fibers 14,15 and monoliths . This scarcity can be justified by the fact that the works found in the literature on the incorporation of heteroatoms do not perform this procedure with the purpose of contributing directly with the increase of the CO2 adsorption capacity, since the materials obtained from that are not analyzed in CO2 capture applications. The materials were characterized by the following techniques: XRD, textural analysis, FTIR, SEM and TG/DTG
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