In addition to acids, other catalysts such as Li salts (LiCl, LiBr, LiAc, LiNO3, or LiClO4) were added to enhance the dissolution of cellulose in [EMIM][OAc]. It was believed that the lithium cation can disrupt the hydrogen bonding network in cellulose [54].

Two polyoxometalates, an acidic form H5[PV2Mo10O4o] and an [EMIM][OAc] compatible form [1-ethyl-3-methylimidazolium]4H[PV2Mo10O40], were prepared and used as catalysts for the dissolution of southern yellow pine (particle size <0.125 mm, 5 wt%) in [EMIM][OAc] at 110°C [55]. The addition of 0.5 wt% acidic polyoxometalate reduced the time for complete dissolution of pine from 46 to 15 h. The regenerated cellulose contained significantly less lignin, with limited losses in cellulose. The [EMIM]-compatible form improved delignification, but with greater cellulose losses in the regenerated cellulose [55].