Potassium and soot interaction in fast biomass pyrolysis at high temperatures

FUEL

卷:225

Article

Trubetskaya, Anna¹  Larsen, Flemming Hofmann²  Shchukarev, Andrey³  Stahl, Kenny⁴  Umeki, Kentaro⁵ 

[1] Umea Univ, Thermochem Energy Convers Lab, S-90187 Umea, Sweden

[2] Univ Copenhagen, Dept Food Sci, Rolighedsvej 26, DK-1958 Copenhagen, Denmark

[3] Umea Univ, Dept Chem, S-90187 Umea, Sweden

[4] Tech Univ Denmark, Dept Chem, Kemitorvet B206, DK-2800 Lyngby, Denmark

[5] Lulea Univ Technol, Energy Sci Div, S-97187 Lulea, Sweden

关键词: Soot;    Potassium;    Biomass;    Fast pyrolysis;    CO2 reactivity;   

DOI  :  10.1016/j.fuel.2018.03.140

来源: Elsevier

【 摘 要 】

This study aims to investigate the interaction between potassium and carbonaceous matrix of soot produced from wood and herbaceous biomass pyrolysis at high heating rates at 1250 degrees C in a drop tube reactor. The influence of soot carbon chemistry and potassium content in the original biomass on the CO2 reactivity was studied by thermogravimetric analysis. The XPS results showed that potassium incorporation with oxygen-containing surface groups in the soot matrix did not occur during high temperature pyrolysis. The potassium was mostly found as water-soluble salts such as KC1, KOH, KHCO3 and K2CO3 in herbaceous biomass soot. The low ash containing pinewood soot was less reactive than the potassium rich herbaceous biomass soot, indicating a dominating role of potassium on the soot reactivity. However, the catalytic effect of potassium on the reactivity remained the same after a certain potassium amount was incorporated in the soot matrix during pyrolysis. Raman spectroscopy results showed that the carbon chemistry of biomass soot also affected the CO2 reactivity. The less reactive pinewood soot was more graphitic than herbaceous biomass soot samples with the disordered carbon structure.

【 授权许可】

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