Abstract
In the present work, the potential of polyPOSS-imide membranes designed for the purification of H2 from a coke gas (utilized in the steelmaking industry) is investigated. Aiming at upscaling the membrane fabrication, tubular single-channel and multi-channel membranes were prepared, using polyhedral oligomeric silsesquioxane (POSS) nanostructures and 6FDA as reactive precursors. The gas separation performance has been investigated by means of single gas and quaternary (H2, CH4, CO2, N2) mixtures, the latter used to simulate the conditions expected at the membrane module inlet in the process of upgrading H2 from a coke oven gas. Preliminary results obtained on tubular membranes showed that the fabricated membranes can achieve high H2 permeance (>2000 GPU), displaying also suitable selectivity towards CO2, N2 and CH4. The selectivity of these upscaled tubular membrane samples meets the performance of those previously obtained for the disc-shaped lab-scale membranes. These results revealed the promising potential in the upscaling of polyPOSS-imide membranes fabricated via interfacial polymerization on ceramic porous supports for H2 upgrading.
Highlights
The growing concerns on climate changes and the limited avail ability of fossil fuels worldwide is expected to lead to fundamental changes in the energy sectors
The performance of the fabricated membranes has been investigated in a wide range of operating conditions, looking both at the effect of operating temperature and pressure, and mixed gas permeation measurements are reported for polyPOSS-imide membranes for the first time
The membrane thickness is controlled by the contact time between the aqueous polyhedral oligomeric silsesquioxane (POSS) and the dianhydride solution
Summary
The growing concerns on climate changes and the limited avail ability of fossil fuels worldwide is expected to lead to fundamental changes in the energy sectors. Climate neutrality [1] is on the agenda of most of the global governments, and carbon-rich energy carriers are expected to be phased out and be replaced with more sus tainable solutions. Hydrogen can store and deliver a considerable amount of energy and its carbon-free nature makes it the most attractive option as energy carrier and electricity storage to pursue the achieve ment of a more sustainable society in the future. In the long-term, a complete elimination of fossil fuels in transport and industry without resorting to hydrogen may be hard to achieve. In the IEA 2DS–high H2 scenario [4], a significant increase in the H2 use is projected, from the current annual energy use of ca. 7 EJ to nearly 30 EJ in 2050
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