Insertion of N2 into the Channels of AFI Zeolite under High Pressure

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Abstract

We present an experimental study of a new hybrid material where nitrogen is encapsulated in the channels of porous zeolite AlPO ₄-5 (AFI) single crystals by a high-pressure method. The high-pressure behavior of nitrogen confined inside the AFI nano-channels is then investigated by Raman spectroscopy up to 44 GPa. Under pressure, the Raman modes of confined nitrogen show behaviors different from those of the bulk nitrogen. After the return to atmospheric pressure, it is demonstrated that non-gaseous nitrogen can be effectively stabilized by being confined inside the intact AFI sample. This result provides new insight into nitrogen capture and storage technologies.

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Most cited references 5

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Single-bonded cubic form of nitrogen.

Mikhail I. Eremets, Ivan A. Trojan, Dymitro A Dzivenko … (2004)

Nitrogen usually consists of molecules where two atoms are strongly triple-bonded. Here, we report on an allotropic form of nitrogen where all atoms are connected with single covalent bonds, similar to carbon atoms in diamond. The compound was synthesized directly from molecular nitrogen at temperatures above 2,000 K and pressures above 110 GPa using a laser-heated diamond cell. From X-ray and Raman scattering we have identified this as the long-sought-after polymeric nitrogen with the theoretically predicted cubic gauche structure (cg-N). This cubic phase has not been observed previously in any element. The phase is a stiff substance with bulk modulus >or=300 GPa, characteristic of strong covalent solids. The polymeric nitrogen is metastable, and contrasts with previously reported amorphous non-molecular nitrogen, which is most likely a mixture of small clusters of non-molecular phases. The cg-N represents a new class of single-bonded nitrogen materials with unique properties such as energy capacity: more than five times that of the most powerfully energetic materials.

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Pressure- and heat-induced insertion of CO2 into an auxetic small-pore zeolite.

Yongjae Lee, Dan Liu, Donghoon Seoung … (2011)

When the small-pore zeolite natrolite is compressed at ca. 1.5 GPa and heated to ca. 110 °C in the presence of CO(2), the unit cell volume of natrolite expands by 6.8% and ca. 12 wt % of CO(2) is contained in the expanded elliptical channels. This CO(2) insertion into natrolite is found to be reversible upon pressure release.

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Author and article information

Journal

Journal ID (nlm-ta): Sci Rep

Journal ID (iso-abbrev): Sci Rep

Title: Scientific Reports

Publisher: Nature Publishing Group

ISSN (Electronic): 2045-2322

Publication date (Electronic): 18 August 2015

Publication date Collection: 2015

Volume: 5

Electronic Location Identifier: 13234

Affiliations

[1 ]State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, P. R. China

[2 ]Institute of New Energy, Bohai University , Jinzhou, Liaoning, 121000, China

[3 ]Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, China

[4 ]GeoScience Department, Stony Brook University, Stony Brook , New York 11794, United States

Author notes

[a ] liubb@ 123456jlu.edu.cn

Article

Publisher Item ID: srep13234

DOI: 10.1038/srep13234

PMC ID: 4539611

PubMed ID: 26282881

SO-VID: 237fc7a3-5701-4540-a83e-7153e569b8b0

License:

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

History

Date received : 16 May 2015

Date accepted : 06 July 2015

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