Preparation and characterization of silica–amine hybrid aerogels containing ionic liquid for the capture of carbondioxide (CO2)
Küçük Resim Yok
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Ege Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu proje ile yanma sonrası oluşan gazlardan CO2 yakalamak amacıyla amin hibrid silika aerojellerin kullanıldığı adsorpsiyon temelli bir sürecin geliştirilmesi hedeflenmiştir. Bu amaçla silika temelli amin hibrid aerojeller farklı kompozisyonlarda sentezlenmiş ve üretilen aerojellerin CO2 yakalama performansları, tasarlanan sabit yatak dolgulu adsorpsiyon düzeneğinde incelenmiştir. Aerojeller, silika başlatıcı olarak tetraetil ortosilikat (TEOS) ve amin kaynağı olarak da (3-Aminopropil) trietoksisilan (APTES) kullanılarak tek aşamalı sol-jel yöntemi izlenerek hazırlanmıştır. Hazırlanan aerojellerin CO2 yakalama performansını arttırmak amacıyla yüksek CO2 çözünürlüğüne ve seçiciliğine sahip, amin içeren (1-Etil-3-metilimidazolyum bis (triflorometilsülfonil) imit) türü bir iyonik sıvı da sol ajanı olarak kullanılmıştır. Sol-jel hazırlama yöntemi sırasında, TEOS mol oranı sabit tutularak, değişik mol oranlarında APTES ve iyonik sıvı değerleri parametre olarak seçilmiştir. Hazırlanan silika aerojellerinin kimyasal yapıları Fourier Dönüşümlü Infirared Spektrometre (FT-IR), ısıl davranışları Termo Gravimetrik Analizler (TGA), yüzey morfolojisi ise Taramalı Elektron Mikroskobu (SEM) analizleri ile incelenmiştir. Ayrıca yüzey alanı ve gözenek çap değerleri Brunauer Emmett ve Teller (BET) teorisi kullanılarak bulunmuştur. Yapılan bir dizi adsorpsiyon denemeleri sonucunda kullanılan amin kaynağı ve iyonik sıvı eklentisinin CO2 tutma kapasitelerini arttırdığı görülmüştür. Yapılan iyileştirme çalışmaları ile 368 saniyede 414.31 mg/g (9.41 mmol/g) CO2 tutma kapasitesine ulaşılmıştır. Elde edilen sonuçlar literatürde yer alan amin içerikli tutucuların kapasiteleriyle kıyaslanmıştır. Böylelikle bu çalışmada üretilen amin hibrid silika aerojellerin CO2 yakalama süreçleri için ümit vaat edici adaylar olabileceği sonucuna varılmıştır
With this project, it is aimed to develop an adsorption based process using amine hybrid silica aerogels to capture CO2 from post-combustion gases. For this purpose, silica based aerogels was synthesized in different compositions and CO2 capture performances of prepared aerogels were investigated in a designed fixed bed column of experimental set-up for adsorption. Aerogels were prepared by following single-step sol-gel method using tetraethoxysilane (TEOS) as silica precursor and (3-Aminopropyl) triethoxysilane (APTES) as amine source. To enhance CO2 capture performance of the prepared aerogels, amine containing ionic liquid (1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) was also used as sol agent because of high CO2 solubility and selectivity. During the sol-gel preparation, the mol ratio of TEOS was kept constant and various mol ratios of APTES and ionic liquid were chosen as preparation parameters. The chemical structure properties were characterized by Fourier Transform Infirared Spectroscopy (FT-IR analysis), the thermal behaviours were analyzed by Thermogravimetric Analysis (TGA), the surface morphologies were examined by Scanning Electron Microscopy (SEM) of prepared silica aerogels. Furthermore, surface area and pore diameter values were also determined by using Brunauer Emmett and Teller (BET) theory. As a result of a series of adsorption experiments, it was shown that amine source and ionic liquid addition were increased CO2 capture capacities. With the implemented improvement studies, the CO2 capture capacity of 414.31 mg/g (9.41 mmol/g) was reached in 368 seconds. Obtained capacity results were compared with capacities of amine containing sorbents in the literature. Thus, it was concluded that amine hybrid silica aerogels produced in this study might be up-and-coming candidates for CO2 capture processes.
With this project, it is aimed to develop an adsorption based process using amine hybrid silica aerogels to capture CO2 from post-combustion gases. For this purpose, silica based aerogels was synthesized in different compositions and CO2 capture performances of prepared aerogels were investigated in a designed fixed bed column of experimental set-up for adsorption. Aerogels were prepared by following single-step sol-gel method using tetraethoxysilane (TEOS) as silica precursor and (3-Aminopropyl) triethoxysilane (APTES) as amine source. To enhance CO2 capture performance of the prepared aerogels, amine containing ionic liquid (1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) was also used as sol agent because of high CO2 solubility and selectivity. During the sol-gel preparation, the mol ratio of TEOS was kept constant and various mol ratios of APTES and ionic liquid were chosen as preparation parameters. The chemical structure properties were characterized by Fourier Transform Infirared Spectroscopy (FT-IR analysis), the thermal behaviours were analyzed by Thermogravimetric Analysis (TGA), the surface morphologies were examined by Scanning Electron Microscopy (SEM) of prepared silica aerogels. Furthermore, surface area and pore diameter values were also determined by using Brunauer Emmett and Teller (BET) theory. As a result of a series of adsorption experiments, it was shown that amine source and ionic liquid addition were increased CO2 capture capacities. With the implemented improvement studies, the CO2 capture capacity of 414.31 mg/g (9.41 mmol/g) was reached in 368 seconds. Obtained capacity results were compared with capacities of amine containing sorbents in the literature. Thus, it was concluded that amine hybrid silica aerogels produced in this study might be up-and-coming candidates for CO2 capture processes.
Açıklama
Anahtar Kelimeler
Kimya, Chemistry, Kimya Mühendisliği, Chemical Engineering, Çevre Mühendisliği, Environmental Engineering
