Gasification reactivity and synergistic effect of conventional and microwave pyrolysis derived algae chars in CO 2 atmosphere

Ashak Mahmud Parvez, Tao Wu, Yu Hong, Wanru Chen, Edward Henry Lester, Sannia Mareta, Muhammad Afzal

Research output: Journal PublicationArticlepeer-review

19 Citations (Scopus)

Abstract

This research focuses on the isothermal and non-isothermal CO 2 gasification of an algal (Chlorella) char prepared via two different thermal processing systems, i.e. conventional and microwave-assisted pyrolysis. It was found that chars prepared via microwave irradiation showed higher CO 2 gasification reactivity than that of chars prepared via the conventional method. Meanwhile, the activation energy of microwave char was found to be 127.89 kJ/mol, which was 46.3 kJ/mol lower than that of conventional char, indicating improved reactivity of microwave char. The systematic characterisation of both conventional and microwave chars shows that the higher reactivity of microwave char could be attributed to its large BET surface area, low crystalline index and high active sites. In addition, it was found that microwave heating contributed to high reactivity of chars through generating large amount of primary char, the formation of hot spot and high specific surface area and pore volume. Results of co-gasification under isothermal conditions revealed the existence of greater synergistic effects between coal char and microwave algae char than those of coal char and conventional algae char. Furthermore, based on the relative Rs (average gasification rate), a novel index proposed to quantify the interactions in co-gasification process, Australian coal char/microwave assisted char blend experienced 10% higher interactions compared to Australian coal char/conventional assisted char blend.

Original languageEnglish
Pages (from-to)730-740
Number of pages11
JournalJournal of the Energy Institute
Volume92
Issue number3
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Algae char
  • CO gasification reactivity
  • Kinetics
  • Microwave pyrolysis
  • Synergistic effect

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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