The pyrolysis study of the ionic liquid (IL)-H2O mixtures pretreated bamboo (Phyllostachys edulis) was investigated. 1-Butyl-3-methylimidazolium chloride ([Bmim]Cl)-H2O

1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4)-H2O and 1-butyl-3-methyl pyrrolidinium chloride ([Bmpy]Cl)-H2O with or without solid acid catalyst (Nafion®NR50) were used in the pretreatment process. The composition analysis result of untreated bamboo and pretreated bamboo were compared. XRD and SEM result were analyzed to explain the effect of ILs mixture on cellulose crystalline structures and surface structures. According to the result of TG-DTA and GC-TCD

the sample pretreated with [Bmim]Cl-H2O mixture was used in the pyrolysis process to produce more gaseous products and low char. About 0.12 g gaseous products and 0.19 g char were produced from 1.0 g sample pretreated with [Bmim]Cl-H2O mixture and added solid acid catalyst

different from the result of untreated sample

0.04 g gaseous products and 0.24 g char. The potential and problems of IL-H2O mixture pretreatment used in thermal chemical conversion methods were discussed.