In
this study, the chemical structure of corn straw lignin and
the catalytic pyrolysis behavior at 350–650 °C in a fixed
bed was investigated, with TiO2-based catalysts (load Cu,
Fe, and Mo) respective to phenolic compounds production. It was found
that β-O-4 is the most frequent linkage in corn straw lignin,
up to 89%. The highest selectivity (79%) and yield (21.17 mg/(g lignin))
of phenols was obtained at 450 °C for lignin pyrolysis. TiO2 addition enhanced the production of bio-oil with more phenols
formed, and the selectivity of phenols reached 86%, with the yield
up to 23.64 mg/(g lignin). With Cu or Fe loading, the yield and selectivity
of phenols decreased, but the content of aromatic ketones increased
obviously. But with Mo addition, the yield and selectivity of phenols
increased apparently to 26.72 mg/(g lignin) and 89%, respectively,
especially for monophenols and guaiacols. This suggests that the thermal
catalytic activity of TiO2 can be further improved by doping
a specific metal.
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