Pyrolysis of pine and gasification of pine chars – Influence of organically bound metals

Role of ash on the NO formation during char oxidation of biomass

“…The one exception is the demineralized sunflower in which $5% of the K remained. It has been found that for some biomass types, not all metals can be removed without more severe treatment, which will then also influence the organic composition [30]. Further, the chlorine contents of the untreated biomasses were determined.…”

“…The procedure was repeated and biomass was finally dried at 105°C. Analysis of wood after this washing procedure has shown that sugars are not removed by this washing procedure, indicating that the organics are not significantly affected [30]. Single particle samples were prepared by pressing 200 mg of each biomass and demineralized biomass into cylindrical pellets with a diameter of 8 mm.…”

Catalytic effect of Ca and K on CO 2 gasification of spruce wood char

“…Lower levels of metal catalyst can therefore be adsorbed to the wood in mildly acidic and neutral conditions, while higher levels are adsorbed in basic conditions. Aho et al compared the CO 2 gasification reactivity of acid washed pine wood samples, adsorbed with various metal catalysts by ion exchange to functional groups in the wood and noted a high reactivity for Ca, although a lower activity than expected for K [25]. Mitsuoka et al tested the CO 2 gasification behavior of acid washed woody biomass char, loaded with 2.4 wt.% Ca and K and gasified under different temperatures and CO 2 concentrations.…”

“…The metals can for example be added by impregnation with a dissolved salt [22,23] or by dry mixing [22,24]. The metals can also be absorbed to the wood by complexation back to the carboxylic and phenolic groups through ion-exchange in a solution containing the metal ions [17,25]. Only the carboxylic groups are ionized in weakly acidic or neutral conditions.…”

Gasification characteristics of sawdust char at a high-temperature steam atmosphere

“…Fu et al [17] observed the variation of the pore structure of biomass during pyrolysis and found the pore structure and morphology of biomass char were significantly affected by temperature. Aho et al [18] investigated the effects of alkali metal on pine pyrolysis and gasification and found that alkali metal catalyzed pyrolysis and gasification. Fatehi et al [19] established a gasification model considering pore structure with carbon conversion rate of biomass char.…”