A comprehensive study of alkali and alkaline earth metal (AAEM) salts including two different anions (Cl^- and CH₃COO^-) in the catalytic pyrolysis of cellulose to produce levoglucosan (LG), bio-oil, and biochar were investigated. At the same time, the catalytic pyrolysis mechanism was also speculated. The thermogravimetric analyzer (TGA) and lab-scale fixed-bed reactor system were used to determine the thermal degradation process and the pyrolysis products of LG, bio-oil, and biochar. The optimized pyrolysis parameters were obtained by using Box-Behnken design-response surface method. According to the results, AAEM salts significantly boosted the yield of biochar, as well as greatly cut down the output of LG and bio-oil. The rank of effect on LG yield was as follows: CaCl₂, MgCl₂ > CH₃COOK, CH₃COONa > (CH₃COO)₂Mg, (CH₃COO)₂Ca > KCl, NaCl. Moreover, the addition of AAEM salts considerably dropped the activation energy E of cellulose pyrolysis as well as prompted microcrystalline cellulose pyrolysis under lower temperatures. This study was pivotal in deducing the pathway of cellulose pyrolysis, thereby offering critical insights to hasten the progress of biomass utilization.

全面研究碱金属和碱土金属 (AAEM) 盐，包括两种不同的阴离子（Cl ^-和 CH ₃ COO ^-) 在纤维素催化热解生产左旋葡聚糖 (LG)、生物油和生物炭方面进行了研究。同时，还推测了催化热解机理。热重分析仪 (TGA) 和实验室规模的固定床反应器系统用于确定 LG、生物油和生物炭的热降解过程和热解产物。采用 Box-Behnken 设计-响应面法获得优化的热解参数。根据结果​​，AAEM 盐显着提高了生物炭的产量，同时大大降低了 LG 和生物油的产量。对LG收率的影响大小依次为：CaCl ₂、MgCl ₂ > CH ₃ COOK、CH ₃ COONa > (CH ₃ COO) ₂Mg, (CH ₃ COO) ₂ Ca > KCl, NaCl。此外，AAEM 盐的添加显着降低了纤维素热解的活化能E，并促进了微晶纤维素在较低温度下的热解。这项研究对于推导纤维素热解的途径至关重要，从而为加快生物质利用的进展提供了重要的见解。