Highly Selective Separation of C2H2 from CO2 by a New Dichromate-Based Hybrid Ultramicroporous Material

Hayley S Scott; Mohana Shivanna; Alankriti Bajpai; David G Madden; Kai-Jie Chen; Tony Pham; Katherine A Forrest; Adam Hogan; Brian Space; John J Perry Iv; Michael J Zaworotko

doi:10.1021/acsami.6b15250

Highly Selective Separation of C₂H₂ from CO₂ by a New Dichromate-Based Hybrid Ultramicroporous Material

ACS Appl Mater Interfaces. 2017 Oct 4;9(39):33395-33400. doi: 10.1021/acsami.6b15250. Epub 2017 Jan 27.

Affiliations

¹ Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick, Republic of Ireland.
² Department of Chemistry, University of South Florida , 4202 East Fowler Avenue, Tampa, Florida 33620, United States.

PMID: 28128918
DOI: 10.1021/acsami.6b15250

Abstract

A new hybrid ultramicroporous material, [Ni(1,4-di(pyridine-2-yl)benzene)₂(Cr₂O₇)]_n (DICRO-4-Ni-i), has been prepared and structurally characterized. Pure gas sorption isotherms and molecular modeling of sorbate-sorbent interactions imply strong selectivity for C₂H₂ over CO₂ (S_AC). Dynamic gas breakthrough coupled with temperature-programmed desorption experiments were conducted on DICRO-4-Ni-i and two other porous materials reported to exhibit high S_AC, TIFSIX-2-Cu-i and MIL-100(Fe), using a C₂H₂/CO₂/He (10:5:85) gas mixture. Whereas CO₂/C₂H₂ coadsorption by MIL-100(Fe) mitigated the purity of trapped C₂H₂, negligible coadsorption and high S_AC were observed for DICRO-4-Ni-i and TIFSIX-2-Cu-i.

Keywords: acetylene; adsorption; carbon dioxide; separation; ultramicroporous materials.