Abstract
The improvement of sodium ions added in the synthesis solution is verified for fabrication of high quality pure-silica MFI zeolite membranes. The effects of sodium ions on separation performance, growth and hydrophobicity of MFI membranes are thoroughly characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) spectroscopy, infrared (IR) spectra, thermogravimetric (TG) analysis, water contact angle test, pervaporation and gas permeation test. It is found that small amounts of sodium ions can result in denser and more hydrophobic membranes with higher pervaporation performance. Large amounts of sodium ions will retard the nucleation and bring about the formation of gel particles, hence resulting in lower pervaporation performance. For separation of 5wt% ethanol feed at 60°C, the separation factor of 76 is achieved at the Na+/Si ratio of 0.1, while it is only 52 without sodium ions in the synthesis solution.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
