Title: Scalable One‐Step Gel Conversion Route to High‐Performance CHA Zeolite Hollow Fiber Membranes and Modules for CO ₂ Separation

Abstract

Efficient separation of CO ₂ from other molecules such as CH ₄ , N ₂ , and hydrocarbons is a key problem in many energy production and greenhouse gas reduction schemes. Zeolite materials demonstrate attractive gas separation properties, but their industrial application as membranes in gas separation are elusive because of high cost and low reproducibility of conventional fabrication techniques. A facile method is demonstrated for the fabrication of high‐silica CHA zeolite membranes on low‐cost alumina hollow fiber substrates by a one‐step direct gel conversion method, along with a detailed characterization of the CHA hollow fiber membranes. To demonstrate the scalability of the method, 20 hollow fiber (710 μm OD and 390 μm ID) membranes are synthesized in the same batch and assembled into a module. Under dry conditions, the membranes show an excellent CO ₂ permeance up to 3500 GPU (1 Gas Permeation Unit = 3.348 × 10 ⁻¹⁰  mol m ⁻²  s ⁻¹  Pa ⁻¹ ) and an excellent CO ₂ separation performance (e.g., CO ₂ /CH ₄ separation factors up to 210 in the 1–7 bar feed pressure range). In addition, the membranes exhibit a considerable increase in CO ₂ selectivity under humid (saturated water vapor) conditions with moderate permeance drops. This study opensmore » a promising new path for accelerated development of low‐cost zeolitic membranes for gas separation technology.« less

Authors:

Yang, Shaowei ^[1]; Chiang, Yadong ^[1]; Nair, Sankar  ^[1]

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• Search DOE PAGES for ORCID "0000-0001-5339-470X"

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+ Show Author Affiliations

1. School of Chemical &, Biomolecular Engineering Georgia Institute of Technology 311 Ferst Drive NW Atlanta GA 30332 USA

Publication Date:

Sun Jun 23 00:00:00 EDT 2019

Sponsoring Org.:

USDOE

OSTI Identifier:

1559366

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Energy Technology

Additional Journal Information:

Journal Name: Energy Technology Journal Volume: 7 Journal Issue: 9; Journal ID: ISSN 2194-4288

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

Germany

Language:

English