利用固体磷酸催化热解纤维素制备左旋葡萄糖酮

摘要

Solid phosphoric acid supported on SBA-15 carrier was mechanically mixed with the cellulose, and then the mixture was subjected to fast pyrolysis to prepare levoglucosenone (LGO). Using Py-GC/MS (pyrolysis-gas chromatography/mass spectrometry) the effect of temperature and catalyst/cellulose ratio on pyrolytic products mainly LGO was examined. The results indicated that the presence of solid phosphoric acid could inhibit formation of levoglucosan (LG) and other byproducts, but promote greatly and selective formation of LGO, one of major pyrolytic products. The maximal LGO yield and relative content were obtained at the temperature of 350℃ and the catalyst/cellulose ratio of 1/1, having the relative peak area of 68.6%. Moreover, the solid phosphoric acid would also promote the dehydration of LG to form LGO.%以SBA-15为载体制备了固体磷酸，将其和纤维素机械混合后进行快速热解制备左旋葡萄糖酮（LGO）。通过 Py-GC/MS（快速热解-气相色谱/质谱联用）实验，考察了催化热解温度、催化剂/纤维素比例对纤维素热解生成LGO以及其他产物的影响。实验结果表明，固体磷酸能够抑制纤维素热解形成左旋葡萄糖（LG）等产物，并大幅促进LGO的生成，从而高选择性地获得以LGO为主的热解产物。在热解温度为350℃以及催化剂/纤维素比例为1/1的条件下，可获得最高的LGO产率与相对含量，相对峰面积值高达68.6%。此外固体磷酸还能促进LG脱水形成LGO。