Vibrational spectroscopy studies of external standards and carbon dioxide sorption onto coal seams
Abstract
This thesis combines work done on external standards and CO2 sorption onto coal powder. The first chapter describes a method for calibrating Raman intensities using a sapphire window as an external intensity standard. This method is demonstrated by measuring solution concentrations and Raman cross sections in various liquids. Concentration measurements are performed using the second derivative variance minimization (SDVM) algorithm to simultaneously subtract the sapphire window spectrum, normalize the solution spectral intensity and quantify solute concentration. The second chapter discusses the changes in several coals’ physical structures once exposed to CO2. The sorption of CO2 was measured using attenuated total reflectance-fourier transform infrared (ATR-FTIR) spectroscopy at constant temperature and pressure. Each coal sample was exposed to CO2, evacuated, and then exposed to CO2 for the second time. The diffusion rate of CO2 into the powdered coal was much faster for the second exposure, confirming the powdered coal underwent a physical rearrangement.
Degree
M.S.
Advisors
Ben-Amotz, Purdue University.
Subject Area
Organic chemistry|Physical chemistry
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