Observation of Olefin/Paraffin Selectivity in Azo Compound and Its Application into a Metal-Organic Framework

Seo Yul Kim, Tae Ung Yoon, Jo Hong Kang, Ah Reum Kim, Tea Hoon Kim, Seung Ik Kim, Wanje Park, Ki Chul Kim, Youn Sang Bae

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Olefin/paraffin separation is an important and challenging issue because the two molecules have similar physicochemical properties. Although a couple of olefin adsorbents have been developed by introducing inorganic nanoparticles into metal-organic frameworks (MOFs), there has been no study on the development of an olefin adsorbent by introducing a certain organic functional group into a MOF. In this study, we posited that azo compounds could offer olefin/paraffin selectivity. We have revealed using first-principles calculations that the simplest aromatic azo compound (azobenzene, Azob) has an unusual propylene/propane selectivity due to special electrostatic interactions between Azob and propylene molecules. On the basis of this interesting discovery, we have synthesized a novel propylene adsorbent, MIL-101(Cr)-DAA, by grafting 4,4′-diaminoazobenzene (DAA) into open metal sites in a mesoporous MIL-101(Cr). Remarkably, MIL-101(Cr)-DAA exhibited enhanced propylene/propane selectivity as well as considerably higher propylene heat of adsorption compared to pristine MIL-101(Cr) while maintaining the high working capacity of MIL-101(Cr). This clearly indicates that azo compounds when introduced into MOFs can provide propylene selectivity. Moreover, MIL-101(Cr)-DAA showed good C3H6/C3H8 separation and easy regeneration performances from packed-bed breakthrough experiments and retained its propylene adsorption capacity even after exposure to air for 12 h. As far as we know, this is the first study that improves the olefin selectivity of MOF by postsynthetically introducing an organic functional group.

Original languageEnglish
Pages (from-to)27521-27530
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number32
DOIs
Publication statusPublished - 2018 Aug 15

Fingerprint

Azo Compounds
Alkenes
Paraffin
Paraffins
Olefins
Propylene
Metals
Adsorbents
Propane
Azobenzene
Functional groups
Adsorption
Molecules
Metal nanoparticles
Packed beds
Coulomb interactions
propylene
MIL-101

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Kim, Seo Yul ; Yoon, Tae Ung ; Kang, Jo Hong ; Kim, Ah Reum ; Kim, Tea Hoon ; Kim, Seung Ik ; Park, Wanje ; Kim, Ki Chul ; Bae, Youn Sang. / Observation of Olefin/Paraffin Selectivity in Azo Compound and Its Application into a Metal-Organic Framework. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 32. pp. 27521-27530.
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abstract = "Olefin/paraffin separation is an important and challenging issue because the two molecules have similar physicochemical properties. Although a couple of olefin adsorbents have been developed by introducing inorganic nanoparticles into metal-organic frameworks (MOFs), there has been no study on the development of an olefin adsorbent by introducing a certain organic functional group into a MOF. In this study, we posited that azo compounds could offer olefin/paraffin selectivity. We have revealed using first-principles calculations that the simplest aromatic azo compound (azobenzene, Azob) has an unusual propylene/propane selectivity due to special electrostatic interactions between Azob and propylene molecules. On the basis of this interesting discovery, we have synthesized a novel propylene adsorbent, MIL-101(Cr)-DAA, by grafting 4,4′-diaminoazobenzene (DAA) into open metal sites in a mesoporous MIL-101(Cr). Remarkably, MIL-101(Cr)-DAA exhibited enhanced propylene/propane selectivity as well as considerably higher propylene heat of adsorption compared to pristine MIL-101(Cr) while maintaining the high working capacity of MIL-101(Cr). This clearly indicates that azo compounds when introduced into MOFs can provide propylene selectivity. Moreover, MIL-101(Cr)-DAA showed good C3H6/C3H8 separation and easy regeneration performances from packed-bed breakthrough experiments and retained its propylene adsorption capacity even after exposure to air for 12 h. As far as we know, this is the first study that improves the olefin selectivity of MOF by postsynthetically introducing an organic functional group.",
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Observation of Olefin/Paraffin Selectivity in Azo Compound and Its Application into a Metal-Organic Framework. / Kim, Seo Yul; Yoon, Tae Ung; Kang, Jo Hong; Kim, Ah Reum; Kim, Tea Hoon; Kim, Seung Ik; Park, Wanje; Kim, Ki Chul; Bae, Youn Sang.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 32, 15.08.2018, p. 27521-27530.

Research output: Contribution to journalArticle

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AU - Kim, Seo Yul

AU - Yoon, Tae Ung

AU - Kang, Jo Hong

AU - Kim, Ah Reum

AU - Kim, Tea Hoon

AU - Kim, Seung Ik

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AU - Kim, Ki Chul

AU - Bae, Youn Sang

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