The stover sugar hydrolysate contained various impurities, including fine solid particles, degradation compounds (acetic acid, furfural, 5-hydromethylfurfural, phenol derivatives etc.), sodium sulfate salt from neutralization of sulfuric acid, and cellulase enzyme residues. These impurities would significantly reduce the activity and life time of nickel catalyst in the consequent hydrogenolysis of sugars into polyols [23] and [24], unless an extensive purification step was processed. Similar purification procedures used for the corn-based glucose preparation were applied to the stover sugar hydrolysate, including the two major steps: decolorization and desalting.