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The effect of ferrous sulfate pretreatment on the optimal temperature for production of sugars during autothermal pyrolysis

Journal Article · · Journal of Analytical and Applied Pyrolysis
Fast pyrolysis is a promising technology for producing cellulosic sugars from lignocellulosic biomass. Success in this endeavor requires measures that prevent naturally occurring alkali and alkaline earth metals (AAEM) from breaking pyranose and furanose rings in lignocellulosic biomass. This is especially critical for high ash feedstocks like corn stover and other kinds of herbaceous biomass. Pretreating corn stover with ferrous sulfate converts AAEM into thermally stable salts, which passivates the catalytic activity of these metals and dramatically improves sugar yields. AAEM passivation in combination with autothermal (partial oxidative) operation improves the prospects for intensifying the production of sugars via fast pyrolysis. We hypothesized that pretreated biomass pyrolyzed in the presence of oxygen can substantially influence the temperature dependence of pyrolysis kinetics. Here, we found that autothermal (air-blown) pyrolysis of ferrous sulfate pretreated corn stover achieved maximum sugar yield of 15.6 wt% (biomass basis) at 450 °C, whereas the maximum phenolic oil yield of 9.2 wt% (biomass basis) was reached at 500 °C. Considering these tradeoffs in yields of these highly desirable pyrolysis products, the ideal operating temperature is between 450 and 500 °C. These results suggest that two-stage pyrolysis might allow maximum recovery of both sugars and phenolic oil.
Research Organization:
Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08GO28308; EE0008326
OSTI ID:
2424632
Alternate ID(s):
OSTI ID: 1968376
Journal Information:
Journal of Analytical and Applied Pyrolysis, Journal Name: Journal of Analytical and Applied Pyrolysis Journal Issue: C Vol. 171; ISSN 0165-2370
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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