Abstract The catalytic effects of ammonium dihydrogen phosphate (ADP) on the biomass pyrolysis and its mechanism for the selective production of furfural (FF) and levoglucosenone (LGO) were investigated in this study. Samples were prepared with rice husk and ADP solutions with gradient-concentration and pyrolyzed via TG-FTIR and Py-GC/MS. Results showed that ADP made the decomposition of cellulose occur at a lower temperature and greatly enhanced the release of C O groups and carbohydrates below 300 °C, indicating the breakage of glycosidic bond and dehydration reaction during pyrolysis were promoted by ADP. In the pyrolysis volatiles, the production of anhydrosugars and furans was promoted significantly. Due to the rearrangement of the methoxy group, the production of methoxy phenols and CH4 was decreased simultaneously. ADP showed good selectivity for both FF and LGO. With the increased ADP dose, the yield and relative content of FF and LGO increased firstly and then kept stable. 400 °C was found the optimal temperature for the production of FF and LGO, where the sum of the relative peak area of LGO and FF could reach 52.23%. Finally, a possible formation pathway of LGO and FF under the catalysis of ADP was speculated.

中文翻译：

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磷酸二氢铵对木质纤维素生物质热解的催化作用：糠醛和左旋葡萄糖酮的选择性生产

摘要 本研究研究了磷酸二氢铵（ADP）对生物质热解的催化作用及其选择性生产糠醛（FF）和左旋葡萄糖酮（LGO）的机理。样品采用梯度浓度的稻壳和 ADP 溶液制备，并通过 TG-FTIR 和 Py-GC/MS 进行热解。结果表明，ADP使纤维素在较低的温度下分解，并在300℃以下大大增强了CO基团和碳水化合物的释放，表明ADP促进了热解过程中糖苷键的断裂和脱水反应。在热解挥发物中，显着促进了脱水糖和呋喃的产生。由于甲氧基的重排，甲氧基苯酚和CH4的产生同时减少。ADP 对 FF 和 LGO 均显示出良好的选择性。随着ADP剂量的增加，FF和LGO的产量和相对含量先增加后保持稳定。400℃是FF和LGO生产的最佳温度，其中LGO和FF的相对峰面积之和可达52.23%。最后，推测了ADP催化下LGO和FF的可能形成途径。