Abstract
In the present study, hydropyrolysis of lignin was investigated by copyrolyzing lignin with sodium formate as the hydrogen donor in order to generate reactive hydrogen atoms under atmospheric pressure. It was found that the free hydrogen atoms released from thermal decomposition of sodium formate promotes the production of phenol, guaiacol, syringol, methyl and ethyl phenols, while reducing the yield of the phenolics with vinyl, propenyl and carbonyl groups. Acetic acid was eliminated by reacting with sodium carbonate byproduct. In comparison to pyrolyzing lignin alone, the pyrolysis-oil produced from copyrolysis of lignin and sodium formate contained a higher fraction of phenolic monomers and a lower fraction of phenolic oligomers both before and after storage. Deuterated sodium formate was copyrolyzed with lignin to investigate the mechanism of hydrogen transfer during low-pressure hydropyrolysis of lignin. Deuterium atoms were found in all of the GC/MS detectable phenolic compounds. As the amount of so...
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