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In order to resolve the AAEM species migration routes and the interaction relationship between biochar structure and AAEM species during biomass pyrolysis, experiments were performed in an entrained flow reactor with $N_2$ at $500{\sim}900^{\circ}C$. ICP-AES, XPS and SEM-EDX were used to examine content and distribution of AAEM species and the physicochemical structures of biochar. The results show that at $500{\sim}700^{\circ}C$, the precipitation rate of AAEM species is relatively high. At high temperature (>$700^{\circ}C$), the AAEM species continue to migrate from interior to exterior, but little precipitation from biochar surface. And the migration of AAEM species is mainly realized by the C-O bond as the carrier medium. The AAEM species on biochar surface are mainly Na, Mg and Ca (<$700^{\circ}C$), while changing to K, Mg and Ca (${\geq}700^{\circ}C$). From $500^{\circ}C$ to $900^{\circ}C$, the biochar particle morphology gradually changes from fibers to porous structures, finally to molten particles. At $700{\sim}900^{\circ}C$, Ca element is obviously enriched on the molten edge of the biochar porous structures.
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