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Issue 17, 2017, Issue in Progress
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Importance of volatile AAEM species to char reactivity during volatile–char interactions

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Abstract

The volatile alkali and alkaline earth metallic (AAEM) species are an important component of the involved reactants during volatile–char interactions and are beneficial to char reactivity. A fluidized-bed/fixed-bed combination reactor was employed to investigate the effects of volatile AAEM species on the char reactivity at 800 °C. ICP-OES and X-ray Photoelectron Spectroscopy (XPS) were utilized to reveal the evolution of AAEM species and char structures during volatile–char interactions. The results indicate that a large proportion of volatile AAEM species would migrate onto the char substrate, amounting to over 50% of the volatilization amount of AAEM species derived from char during volatile–char interactions. Concentrations of AAEM species accord well with the oxygen atomic concentrations on the char surface. The volatile AAEM species migrated onto the char would bond with the oxygen preferentially, likely to stabilize the oxygen-containing structures. The reactivity of the char reacted with the volatile loading of AAEM species is about two times higher than that reacted with the volatile free-of-AAEM species. It is believed that the volatile AAEM species show a better catalytic activity than the residual AAEM species in original char, possibly due to the more stable bonds between volatile AAEM species and the char matrix, or the better dispersion of volatile AAEM species in char. The conclusions clearly demonstrate that the volatile AAEM species play a significant role in the char reactivity.

Graphical abstract: Importance of volatile AAEM species to char reactivity during volatile–char interactions

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Publication details

The article was received on 29 Nov 2016, accepted on 25 Jan 2017 and first published on 07 Feb 2017


Article type: Paper
DOI: 10.1039/C6RA27485D
Citation: RSC Adv., 2017,7, 10397-10406
  • Open access: Creative Commons BY-NC license
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    Importance of volatile AAEM species to char reactivity during volatile–char interactions

    C. Du, L. Liu and P. Qiu, RSC Adv., 2017, 7, 10397
    DOI: 10.1039/C6RA27485D

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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