Modification of zeolites via molecular layer deposition for CO2 capture
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Authors
Ciora, Richard John, III
Issue Date
2020-12
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Chemical engineering
Alternative Title
Abstract
A tailor-made molecular layer deposition (MLD) flow system was designed and constructed for large scale fabrication of MLD coatings on zeolites for CO2 capture. The MLD flow system was then validated by fabricating MLD coatings on two zeolites (5A and 13X) using the precursors titanium tetrachloride (TiCl4) and ethylene glycol. The pristine and MLD modified zeolites were evaluated for CO2 capture properties via CO2 and N2 isotherms at 20oC. Langmuir b-value from the CO2 isotherms of the 5A zeolite was reduced from 48.7 to 40.8 1/bar between 0 and 10 MLD cycles and displayed no further reduction between 10 and 20 MLD cycles. In contrast, the Langmuir b-value of the 13X zeolite was continuously reduced from 29.3 to 8.1 1/bar for 0 to 40 MLD cycles. Considering the molecular size of TiCl4 is between the limiting pore diameter of 5A (0.5 nm) and 13X zeolite (1.0 nm), it was hypothesized that the dramatic reduction in Langmuir b-value for 13X zeolite was due to MLD in the internal pores and a change in adsorbent-adsorbate interaction.
Description
December 2020
School of Engineering
School of Engineering
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY