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Abstract
Biogas upgrading is a key operation for transforming raw biogas into valuable biomethane that can be used as fuel or transported through pipelines. Pressure swing adsorption (PSA) is one possible technique that can be used for upgrading. ZSM-5 with high silica/aluminum (Si/Al) ratio has a reasonable CO2/CH4 selectivity and an almost linear CO2 adsorption isotherm, which can reduce power consumption. Extrusion of zeolites uses Al-based binders which can result in a denaturation and in a decrease of Si/Al ratio, promoting a steeper CO2 isotherm and also impacting the water adsorption. In this work, we have extruded a ZSM-5 (with a Si/Al = 200) using only silica-based binder. Different samples were obtained using different extrusion paste compositions and operating conditions and their textural properties characterized. The mechanical strength of the samples as well as the CO2, CH4, and H2O adsorption equilibrium isotherms at 303–343 K were measured. Our results show that it is possible to produce extrudates with mechanical resistance comparable to (or higher than) commercial zeolite materials with surface area reductions lower than 10% and little or no impact on the CO2/CH4 selectivity.
Highlights
IntroductionThe vast possibilities of surface customization have boosted the research on separation technologies, like membranes and adsorption-based processes [1,2]
Over the last 50 years, there has been an enormous expansion of the available porous materials.The vast possibilities of surface customization have boosted the research on separation technologies, like membranes and adsorption-based processes [1,2]
This study has focused on the extrusion of zeolite ZSM-5 with high Si/Al ratios using silica
Summary
The vast possibilities of surface customization have boosted the research on separation technologies, like membranes and adsorption-based processes [1,2]. For new materials, there is a large gap between discovery and its utilization in industrial applications. Such gap lays primarily in having a good knowledge of proper practices for the shaping of powders into millimeter-scale particles [3,4,5,6,7]. Particles are in the mm-scale to keep the pressure drop controlled while limiting diffusion effects. The typical shapes of industrial porous materials are pellets, extrudates, laminates, and monoliths [9]
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