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This work focuses on the support effect of the performances of Co based catalysts for acetic acid steam reforming. SBA-15, a well ordered hexagonal mesoporous silica structure, and CeO₂ have been selected as the supports, with the impact of chromium addition also being investigated. Better acetic acid steam reforming performances have been recorded for CeO₂ compared to SBA-15 supported catalysts and, in particular, the 7Co/CeO₂ catalyst showed the highest values of acetic acid conversions with enhanced H₂ yields below 480 °C, in comparison to the other investigated catalytic formulations. In addition, more pronounced coke depositions and acetone concentrations have been obtained with CeO₂ supported catalysts, due to the tendency of ceria to catalyse the ketonization reaction. Chromium addition to Co/SBA-15 catalysts led to an enhancement in the activity towards acetic acid steam reforming, while on CeO₂ supported catalysts no improvement in the catalysts’ activity was observed. However, on both SBA-15 and CeO₂ supported catalysts, Cr addition reduced the amount of coke deposited on the catalysts surface.