Extrusion and Characterization of High Si/Al Ratio ZSM-5 Using Silica Binder

Ana Almeida, Rui P. P. L. Ribeiro, José P. B. Mota and Carlos Grande
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Ana Almeida: SINTEF Industry, Forskningsveien 1, 0373 Oslo, Norway
Rui P. P. L. Ribeiro: LAQV-REQUIMTE, Department of Chemistry, Faculty of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
José P. B. Mota: LAQV-REQUIMTE, Department of Chemistry, Faculty of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Carlos Grande: SINTEF Industry, Forskningsveien 1, 0373 Oslo, Norway

Energies, 2020, vol. 13, issue 5, 1-15

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 CO 2 /CH 4 selectivity and an almost linear CO 2 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 CO 2 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 CO 2 , CH 4 , and H 2 O 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 CO 2 /CH 4 selectivity.

Keywords: zeolite; ZSM-5; adsorption; biogas upgrading; shaping; extrusion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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