Abstract
Ethanol steam reforming over supported nickel catalysts has become an attractive industrial hydrogen production process. In this work, A-site deficient titanate perovskites with different doping amount of Ni as B-site substitution, La0.4Ca0.4NixTi1-xO3-δ (x = 0.03, 0.06, 0.09), were synthesized by solid state method. Finely dispersed Ni nanoparticles were obtained by reduction in 5% hydrogen at 800 °C. Complete conversion of ethanol and a hydrogen yield of 70% was achieved on La0.4Ca0.4Ni0.09Ti0.91O2.91 at 800 °C with a steam/carbon ratio of 3 and a WHSV of 8.8 gethanol/(gcat·h). SEM and TEM images of revealed that agglomeration of Ni nanoparticles was inhibited on post-ESR La0.4Ca0.4Ni0.09Ti0.91O2.91 catalyst, indicating a strong metal-support interface was formed via exsolution process. Meanwhile the resistance towards coking as well as its catalytic stability under high feedstock flowrate shows its significance as a potential reforming catalyst.
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