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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

GASIFICATION MECHANISM OF WOODY BIOMASS-DERIVED CHAR WITH SUPPORTED Fe CATALYSTS

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.022290
pages 7782-7789

Résumé

This study examined the mechanism of enhancement of the gasification rate of biomass char when supported with Fe or K. The alkali metal catalysts were directly supported on the char with support ratios of 0, 2, 6, 10, and 20 wt%. For the K-supported char, the gasification rate increased as the support ratio increased, reaching a maximum at 10 wt%. Although the amount of char-supported K slightly decreased upon heating during gasification (evaporation and scattering), the catalyst was not completely removed. The catalyst remaining on the surface and inside the char was still able to exert its influence. Although the gasification rate of the Fe-supported char increased as the support ratio increased, it was significantly lower than that of the K supported char. This low gasification tendency can be attributed to poor impregnation of char with Fe as a large number of Fe crystals were laminated on the char surface. There were closed-pores in the initial stages of gasification, the pores developed with increased in carbon conversion because Fe partially migrated into the bio-char and the Fe-catalyst was difficult to volatilize. The abovementioned heterogeneous impregnation of Fe during gasification contributed to the low gasification of the Fe-supported char.