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High performance carbon dioxide capture using cation exchanged 2D layered vanadosilicate

초록

Zeolites are porous materials that are used in a wide range of applications, including gas separation, ion exchange, and catalysis, due to their unique properties. A 2D zeolite is a type of zeolite that has a two-dimensional layered structure, this layered structure leads to unique properties that are not present in traditional three- dimensional zeolites, such as enhanced selectivity and accessibility to molecules. Several techniques have been discovered to create these materials, and the synthesis of 2D zeolites has been a focus of study in recent years. The properties and potential applications of 2D zeolites are still being explored, but they appear to have potential for usage in processes like gas separation and catalysis. The increase of atmospheric carbon dioxide levels has sparked a search for a breakthrough technology to reduce carbon dioxide's influence on the climate. Adsorption of CO2 was used to study ion exchange on Na-SGU-7 layered zeolites with mono and divalent cations. Among the materials assessed, Sr-SGU-7 is a microporous vanadosilicate material that demonstrated excellent stability and recyclability as an adsorbent under different gaseous environments. Ion exchange is a common process in zeolites, which are porous materials that can trap and exchange ions with surrounding solutions. In this study, we investigated how the presence of different cations in the zeolite affected its ion exchange properties and CO2 adsorption capacity. The findings demonstrated that Sr-SGU-7 had a high selectivity for CO2 and that the type of cation in the zeolite had an impact on its capacity for adsorption. Sr-SGU-7 exhibited a highly enhanced CO2 adsorption capacity of 3.58 mmol/g with an internal pressure of 1 bar at 25 °C which was higher than those of the many reported two-dimensional layered zeolite materials. Finally, a dynamic breakthrough experiment was carried out on Sr-SGU-7, and certain layered zeolite and Sr-SGU-7 were shown to be the most effective adsorbent among them. Because of its high adsorption performance and superior adsorption characteristics, the findings imply that a layered zeolite is ideal for CO2 capture. Overall, this study highlights the potential of microporous vanadosilicates like Sr- SGU-7 as effective adsorbents for capturing CO2 and other gases from the environment.

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목차

Chapter 1. Introduction 1
1.1 The Earth's climate is getting warmer 1
1.2 Way to Cut CO2 Emissions 3
1.3 CO2 Capture Routes 6
1.4 References 8
Chapter 2. Zeolite 10
2.1 Zeolite Overview 10
2.1.1 Titanosilicate (ETS-4) 12
2.1.2 Coppersilicate, (SGU-29) 13
2.2 Properties and Applications 15
2.2.1 Catalysis and adsorption 15
2.2.2 Ion exchange properties of zeolite 17
2.2.1.1 Basic concept 18
2.2.1.2 Ion exchange isotherm of zeolite 19
2.2.1.3 Ion selectivity of zeolite 22
2.2.1.4 Distribution coefficient, 25
2.3 Types of Zeolites 26
2.4 References 28
Chapter 3. 2D Layered Zeolite 30
3.1 Why 2D zeolite materials is good for CO2 capture 31
3.2 Objectives 32
3.3 2D zeolites prepared by different approaches 34
3.4 Properties of 2D layered Zeolite 36
3.5 Contributions to the field of 2D layered zeolites 38
3.6 Summary and prospective views 40
3.7 References 42
Chapter 4. Material and Methods 44
4.1 Materials 44
4.2 Methods 44
4.2.1 Synthesis of Na-SGU-7 44
4.2.2 Ionic exchange of Na-SGU-7 47
4.2.3 Preparation of Sr-SGU-7 47
4.2.4 Strontium (II) Ion Exchange Material Preparation (Sr-SAPO-34) 47
4.2.5 Preparation of MCM-22 48
4.2.6 Preparation of IPC-3 Zeolite 49
4.3 Characterization of samples 50
4.3.1 X-ray powder diffraction analysis 50
4.3.2 Analysis of electron microscopy data 51
4.3.3 Analysis of Transmission Electron microscopy data 52
4.3.4 Thermogravimetric study 53
4.3.5 Infrared Spectrum 53
4.4 Gas sorption measurements 54
4.5 Dynamic column CO2 breakthrough experiments 56
4.6 Structural configuration of SGU-7 57
Chapter 5. Result and Discussion 61
5.1 Transmission Electron microscopy (TEM) Images 62
5.2 Scanning Electron Microscopy (SEM) Images 63
5.3 X-ray Powder Diffraction Patterns 66
5.4 TGA analysis 69
5.5 FTIR spectroscopy 70
5.6 BET adsorption isotherm 76
5.7 Dynamic CO2 breakthrough profiles 83
5.7.1 Breakthrough profile for dry and humid flue gas 85
5.8 Breakthrough profile for atmospheric gas 89
5.9 References 91
Chapter 6. Conclusions and Future outlooks 97
6.1 Conclusions 97
6.2 Future research directions for 2D layered zeolite materials in CO2 capture 98
6.3 Implications for CO2 capture technology 99
Publications 102

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