Novel zeolite/carbon monolith adsorbents for efficient CH4/N2 separation

Jiaqi Liu, Hua Shang, Jiangfeng Yang, Jun Wang, Jinping Li, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

The Si/Al ratio in zeolite will be altered and the porous structure will be diluted by the traditional silica/aluminum-based binder in the granulation process. Here, a novel zeolite/activated carbon monolith (Z/AC) was prepared by adding coal-tar pitch in silicalite-1 (Si/Al greater than 400), where the pure silica characteristic is well maintained and the coal-tar pitch transforms to porous carbon with a uniform pore structure, in comparison, the aluminum-based bonded silicalite-1 pellet (ABSP) shows a much lower Si/Al ratio of 4.1. As a result, the Z/AC-600 monolith demonstrates a competitive CH4 adsorption capacity of 23.45 cm3/g, outperforming silicalite-1 powder and ABSP pellet, and the CH4/N2 selectivity is higher than 4.0 at 298 K and 1 bar. The gas-mixture breakthrough experiments demonstrated that Z/AC-600 can effectively separate the CH4/N2 mixtures (20/80 and 50/50; v/v) with dynamic selectivity of 4.2 and 3.9, respectively. Pressure swing adsorption (PSA) simulations further indicate that, by one step enrichment, pristine 50% methane can be enriched to 80% with a recovery of 85%.

Original languageEnglish (US)
Article number130163
JournalChemical Engineering Journal
Volume426
DOIs
StatePublished - Dec 15 2021

Keywords

  • Activated carbon
  • Adsorbent Monolith
  • Coalbed methane
  • PSA simulation
  • Separation
  • Silicalite-1 zeolite

ASJC Scopus subject areas

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

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