Synthesis and functionalization of cauliflower-like mesoporous siliceous foam materials from oil shale waste for post-combustion carbon capture

Yang MENG, Yuxin YAN, Xinyun WU, Nusrat Sharmin, Haitao ZHAO, Edward Lester, Tao Wu, Cheng Heng Pang

Research output: Journal PublicationArticlepeer-review

4 Citations (Scopus)

Abstract

In this work, meso-structured siliceous form materials (SFM) were synthesized from oil shale ash via a green and time-saving microemulsion templating method and modified with polyethleneimine (PEI) for post-combustion carbon capture. The effects of preparation conditions, such as P123/TMB ratio, aging temperature and pH values, on sample morphology and pore structure were studied to understand the characteristics of inorganic silica precursors. Results show that the SFMs possess 3-dimensional porous framework with a large surface area of 901.3 m3/g and a pore volume of 2.0 cm3/g. The CO2 adsorption behaviour of PEI-impregnated SFMs were investigated in terms of CO2 adsorption capacity and temperature swing adsorption (TSA) cycling stability under a simulated flue gas condition (75 °C and 15% CO2/N2). The results show that pore-expanded SFMs with 50 wt% PEI loading exhibited higher CO2 uptake (109 mg/g-adsorbent) compared to non-pore-expended materials (50 mg/g-adsorbent) and no appreciable reduction in CO2 uptake was observed in the first 10 cycles. However, the DRIFTS spectra of CO2-evacuated adsorbents revealed the presence of alkylammonium carbamates residuals and formations of urea species. This could explain the reduction in CO2 adsorption capacity after 10 cycles.

Original languageEnglish
Article number101199
JournalJournal of CO2 Utilization
Volume40
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Amine functionalization
  • Carbon capture
  • DRIFTS analysis
  • Mesoporous siliceous materials
  • Oil shale

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Synthesis and functionalization of cauliflower-like mesoporous siliceous foam materials from oil shale waste for post-combustion carbon capture'. Together they form a unique fingerprint.

Cite this