The study investigated the effects of methanogen pretreatment on pyrolysis behaviors of corn stalk (CS)
by using Py–GC/MS analysis and thermogravimetric analysis. Results indicated that biopretreatment
changed considerably the pyrolysis behaviors of CS from four weight loss stages to two weight loss
stages. Increasing biopretreatment time from 5 days to 25 days enhanced the kinds and contents of
chemicals in volatile products. In pyrolysis products, the contents of sugars, linear ketones and furans
decreased from 1.43%, 12.60% and 7.38% to 1.25%, 10.22% and 3.25%, respectively, and the contents of
phenols increased from 15.08% to 27.84%. The most content change from 6.83% to 13.63% indicated that
methanogen pretreatment improved the pyrolysis selectivity of CS to product the 4-VP, but it was disadvantageous
to 5-hydroxymethyl furfural, levoglucose and furfural. The changes of chemical compositions
and structure of CS after biopretreatment were the main reason of the differences.
The study investigated the effects of methanogen pretreatment on pyrolysis behaviors of corn stalk (CS)
by using Py–GC/MS analysis and thermogravimetric analysis. Results indicated that biopretreatment
changed considerably the pyrolysis behaviors of CS from four weight loss stages to two weight loss
stages. Increasing biopretreatment time from 5 days to 25 days enhanced the kinds and contents of
chemicals in volatile products. In pyrolysis products, the contents of sugars, linear ketones and furans
decreased from 1.43%, 12.60% and 7.38% to 1.25%, 10.22% and 3.25%, respectively, and the contents of
phenols increased from 15.08% to 27.84%. The most content change from 6.83% to 13.63% indicated that
methanogen pretreatment improved the pyrolysis selectivity of CS to product the 4-VP, but it was disadvantageous
to 5-hydroxymethyl furfural, levoglucose and furfural. The changes of chemical compositions
and structure of CS after biopretreatment were the main reason of the differences.
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