Upgrading of biogas to renewable natural gas (RNG) can supplement conventional natural gas in the electric power sector. Biogas is composed of 50-70% methane and 30-50% CO2 with 0.05-5% H2S and trace water vapor, depending on the feed source composition to the bio digester. The corrosive, explosive and poisonous properties of H2S lead to the need for its removal from raw biogas. Moving away from conventional liquid amine absorption is the first step in improving the energy costs and reducing the loss of bio methane during biogas upgrading. The use of adsorbents has been found to improve energy efficiency but requires stable and high H2S adsorption capacity materials for its implementation. Amine-modified adsorbents suitable for performing fundamental studies are used to determine the effect of kinetics and thermodynamics during amine-H2S interactions. This work employs an array of characterization techniques to determine physicochemical properties of the adsorbents before and after the capture of H2S. Also, performance and stability studies have been examined with a thermogravimetric analyzer (TGA) and fixed bed adsorption system connected to a mass spectrometer (MS). H2S adsorption isotherms of amine adsorbents built with propyltrimethoxysilane linkers and their adsorption performance in the single component adsorption of CO2 will be described at both high and low amine loadings.

Hydrogen sulfide capture using amine-modified mesoporous adsorbents

255th National Meeting (2018)

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