Bimetallic ions regulate pore size and chemistry of zeolites for selective adsorption of ethylene from ethane

Yuzong Liu, Ying Wu, Wanwen Liang, Junjie Peng, Zhong Li, Haihui Wang, Michael J. Janik, Jing Xiao

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The petrochemical industry currently accomplishes olefin/paraffin separation by energy-intensive cryogenic distillation at an enormous scale. We report a sequential Ca2+/Ag+ ion-exchanged zeolite that achieves nearly ideal molecular sieving of C2H4/C2H6 and superior C2H4 adsorption capacity. Sequential and partial ion exchange regulates the pore size in ±0.2 Å increments, ranging between 3.8 and 4.2 Å. The demonstrated C2H4 adsorption capacity of 3.7 mmol/g, under ambient conditions, is the highest among zeolite-based materials. Elaborated with DFT calculations, Ag+-induced the stretching of the C-H bond and reduction of H-C-H bond angle of the C2H4 molecule in confined pore, providing C2H4 with the molecular basis and favorable kinetics for selective admission to pore size even less than 4 Å. The strategy of using bimetallic ions to regulate pore aperture size and selective admission of gas molecules with favorable kinetics provides a general path to be extended to other analogous molecular separation processes.

Original languageEnglish (US)
Article number115636
JournalChemical Engineering Science
Volume220
DOIs
StatePublished - Jul 20 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Bimetallic ions regulate pore size and chemistry of zeolites for selective adsorption of ethylene from ethane'. Together they form a unique fingerprint.

Cite this