Doktorarbeit / Dissertation, 2015
171 Seiten, Note: 1
This dissertation investigates the synthesis and characterization of silicon oxycarbonitride ceramics for gas capture and separation. The work focuses on the development of novel materials with tailored properties for efficient storage and separation of gases like hydrogen (H₂) and carbon dioxide (CO₂).
Chapter 1 provides a comprehensive literature review on the synthesis of silicon nitrides and carbonitrides, focusing on ammonia-assisted methods. It also explores the use of microporous materials for gas capture and storage, highlighting current research trends and perspectives for both H₂ and CO₂. The chapter concludes with a discussion on gas separation methods and the role of membranes in H₂ separation, emphasizing the importance of polymer-derived ceramics (PDCs) in this field.
Chapter 2 outlines the experimental procedures employed in the dissertation. It details the materials used, the synthesis parameters, and the characterization techniques applied. The chapter covers various analytical methods, including elemental analysis, Fourier transform infrared spectroscopy (FTIR), simultaneous thermal analysis (STA), X-ray scattering, solid-state nuclear magnetic resonance (NMR), transmission electron microscopy (TEM), and gas adsorption experiments.
Chapter 3 delves into the structure and porosity characteristics of the synthesized silicon oxycarbonitride ceramics. It explores the thermal transformation of ceramers to ceramics, investigates nitrogen incorporation, and elucidates the local structures using NMR spectroscopy. The chapter further analyzes the homogeneity of elemental distribution, porosity development, and the nature of the adsorbing surfaces. It concludes with a discussion on the relationship between structure and porosity.
Chapter 4 focuses on the application of silicon oxycarbonitride ceramics for gas capture and separation. It examines the CO₂ capture capacity of ultramicroporous silicon nitride based ceramics, investigating the physical nature of adsorption and its dependence on pore size. The chapter also presents H₂ adsorption isotherms and discusses the gas permeation properties of ceramic membranes derived from polycarbosilane and polysiloxane.
Silicon oxycarbonitride ceramics, ammonia-assisted synthesis, gas capture, gas separation, hydrogen storage, carbon dioxide capture, microporous materials, polymer-derived ceramics, ceramic membranes, gas permeation, structure-property relationship.
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