Study on characteristics of hydrogen production by microwave-assisted pyrolysis of macroalgae
Macroalgae does not require arable land and does not contain lignin that is difficult to pyrolysis,which is an ideal raw material for carbon reduction and the production of small molecule biofuels.The microwave-assisted pyrolysis of large seaweed(including kelp,grateloupia livida,ulva pertusa kjellm and sargassum miyabei)was studied and compared with that of larch.The temperature rise behavior,gas release behavior and hydrogen generation curve during microwave-assisted pyrolysis were studied and the product distribution,gas composition and gasification index were compared.Further,Ca-Al(CaO-Al2O3)sorbent was used to absorb carbon dioxide(CO2)generated by microwave-assisted pyrolysis of kelp in situ,and the directed conversion of kelp to hydrogen production was strengthened.The results show that macroalgae had faster heating behavior and better hydrogen production effect than larch,especially the hydrogen yield of kelp(16.40 g/kg)is three times that of larch.The addition of Ca-Al sorbent can further enhance the hydrogen production efficiency of kelp with microwave-assisted pyrolysis.When the mass ratio of kelp to Ca-Al sorbent is 1.0∶3.0,the hydrogen yield can reach 44.24 g/kg,and the gasification efficiency reaches 68.57%,the content of hydrogen in the gas product is as high as 77.24%.
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