The catalytic steam gasification of bio-oil/biochar slurry (bioslurry) for hydrogen-rich syngas production was investigated in a fixed-bed reactor using LaXFeO3 (X = Ce, Mg, K) perovskite-type catalysts. The effects of elemental substitution in LaFeO3, temperature, water to carbon molar ratio (WCMR) and bioslurry weight hourly space velocity (WbHSV) were examined. The results showed that La0.8Ce0.2FeO3 gave the best performance among the prepared catalysts and had better catalytic activity and stability than the commercial 14 wt.% Ni/Al2O3. The deactivation caused by carbon deposition and sintering was significantly depressed in the case of La(0.8)Ce(0.2F)eO(3) catalyst. Both higher temperature and lower WbHSV contributed to more H-2 yield. The optimal WCMR was found to be 2, and excessive introducing of steam reduced hydrogen yield. The La0.8Ce0.2FeO3 catalyst gave a maximum H-2 yield of 82.01% with carbon conversion of 65.57% under the optimum operating conditions (temperature = 800 degrees C, WCMR = 2 and WbHSV = 15.36 h(-1)). (C) 2015 Elsevier Ltd. All rights reserved.