Preparation of graded silicalite-1 substrates for all-zeolite membranes with excellent CO2/H-2 separation performance
Number of Authors: 6
2015 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 493, 206-211 p.Article in journal (Refereed) Published
Graded silicalite-1 substrates with a high gas permeability and low surface roughness have been produced by pulsed current processing of a thin coating of a submicron silicalite-1 powder onto a powder body of coarser silicalite-1 crystals. Thin zeolite films have been hydrothermally grown onto the graded silicalite-1 support and the all-zeolite membranes display an excellent CO2/H-2 separation factor of 12 at 0 degrees C and a CO2 permeance of 21.3 x 10(-7) mol m(-2) s(-1) Pa-1 for an equimolar CO2/H-2 feed at 505 kPa and 101 kPa helium sweep gas. Thermal cracking estimates based on calculated surface energies and measured thermal expansion coefficients suggest that all-zeolite membranes with a minimal thermal expansion mismatch between the graded substrate and the zeolite film should remain crack-free during thermal cycling and the critical calcination step.
Place, publisher, year, edition, pages
2015. Vol. 493, 206-211 p.
All-zeolite membranes, Membrane separation, Gas separation, Cracking, Thermal cycling
Chemical Engineering Chemical Sciences
IdentifiersURN: urn:nbn:se:su:diva-121484DOI: 10.1016/j.memsci.2015.06.020ISI: 000360554300021OAI: oai:DiVA.org:su-121484DiVA: diva2:860624