An unprecedented c-oriented DDR@MWW zeolite hybrid membrane: new insights into H2- permselectivities via six membered-ring pores

Title
An unprecedented c-oriented DDR@MWW zeolite hybrid membrane: new insights into H2- permselectivities via six membered-ring pores
Authors
최낙원장은희이정현홍성원정양환김진철김동재Hionsuck Baik김은주남재욱조성준곽상규최정규
Issue Date
2020-07
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 8, NO 28-14081
Abstract
Despite the success of several types of homogeneous zeolite membranes, the manufacturing based on only one type of zeolite largely limits the flexible, reliable synthetic route toward the formation of continuous zeolite membranes. Herein, we demonstrate heterogeneous epitaxial growth of a seed layer using two structurally compatible zeolites. Specifically, MCM-22 (MWW type zeolites) seed layers were epitaxially grown with a synthetic precursor that leads to the DDR type zeolite. The resulting heterogeneous films, referred to as DDR@MWW hybrid films, were continuously formed on porous supports. Furthermore, heteroepitaxial growth of the c-oriented MCM-22 seed layer yielded a preferential c-out-of-plane orientation; accordingly, six membered-ring (6-MR) pores (having a maximum size of ∼0.28 nm) along the c-axis of the MWW and DDR zeolites were, for the first time, aligned in the out-of-plane direction. Subsequently, this good model sample was adopted for determining the H2-permselectivities of the 6-MR pores; surprisingly, the 6-MR pores were rather impermeable to both H2 and CO2 molecules up to ∼200 °C so that the c-oriented hybrid membrane exhibited modest CO2-permselectivities over N2 (0.364 nm) or CH4 (0.38 nm) at the expense of reduced CO2 molar flux. Lastly, this experimental observation was further complemented with rigorous molecular dynamics simulations on well-designed DDR zeolite membranes.
URI
http://pubs.kist.re.kr/handle/201004/72523
ISSN
2050-7488
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE