Microcrystalline cellulose PH-101 was dissolved by the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). Two kinds of regenerated cellulose with lower crystallinity (C1 and C2) were obtained by different regeneration methods. XRD was used to determine crystallinity of materials

thermogravimetric (TG) was used to determine thermal stability

and scanning electron microscopy (SEM) was used to observe the difference of morphology. The effect of crystallinity on pyrolysis characteristics of cellulose was obtained by analyzing the pyrolysis products from the cellulose with different degrees of crystallinity. Py-GC/MS results showed that the cellulose with lower degree of crystallinity had lower levoglucosan yield but higher yield of small molecule components.