Ionic liquid – grafted mesoporous silica exhibiting reverse selectivity for ethane/ethylene separation: Separation and Purification Technology

Fahmi Anwar, K. Suresh Kumar Reddy, Anish Mathai Varghese, M. Khaleel, K. Wang, G.N. Karanikolos

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Development of paraffin-selective adsorbents for the separation of ethane/ethylene mixtures, as an alternative technology to the energy-intensive cryogenic distillation, is challenging. Herein, we report surface-functionalized mesoporous silica adsorbents exhibiting reverse selectivity prepared by controlled in-situ synthesis of paraffin-selective ionic liquids (ILs) onto the pre-silanized surface of MCM-41 mesoporous silica. The surface modification switched the selectivity of the adsorbents from being inherently olefin-selective to becoming paraffin-selective, due to the enhanced van der Waal's interactions between the grafted IL functionalities and the ethane molecules. A range of silica-based adsorbents functionalized with ILs of different loadings and anion and cation types were synthesized, characterized and investigated for their ethane/ethylene adsorption behavior. In addition to reversing the selectivity yielding values of up to 3.4 for ethane over ethylene, the adsorbents exhibited low isosteric heat of adsorption, indicatively 12 kJ/mol for ethane, while their performance was stable upon pressure swing adsorption and breakthrough cyclic testing. Dynamic packed bed experiments with ethane/ethylene mixtures demonstrated a breakthrough ethylene productivity of up to 1.2 mmol/g with a breakthrough selectivity of 2.4. © 2023 Elsevier B.V.
Original languageBritish English
JournalSep. Purif. Technol.
Volume323
DOIs
StatePublished - 2023

Keywords

  • Adsorption
  • Ethane
  • Ethylene
  • Ionic liquid
  • MCM-41
  • Reverse selectivity
  • Distillation
  • Grafting (chemical)
  • Ionic liquids
  • Mesoporous materials
  • Packed beds
  • Silica
  • Alternative technologies
  • Cryogenic distillations
  • Energy
  • Functionalized
  • In-situ synthesis
  • Mesoporous silicas
  • Selective adsorbents
  • Silica adsorbent

Fingerprint

Dive into the research topics of 'Ionic liquid – grafted mesoporous silica exhibiting reverse selectivity for ethane/ethylene separation: Separation and Purification Technology'. Together they form a unique fingerprint.

Cite this