In this work LaNiO3 perovskites-type precursors were characterized and had their performances evaluated during the steam reforming of LPG to produce hydrogen. Three precursors were synthetized: a non-supported perovskite (LaNi), a supported perovskite on Al2O3 (LaNi/AL) and a supported perovskite on CeO2-SiO2 (LaNi/CS). In situ XRD analyses indicated that all samples were successfully reduced at 700 °C, except for LaNi/AL. This result was ascribed to NiAl2O4 and LaNi0.5Al0.5O3 phases observed on this sample, which might have granted a high thermal stability to the precursor. TPR and XANES tests indicated that the unsupported perovskite had lower reduction temperatures than the supported ones which shows a clear influence of the supports in the thermal stability of the catalysts. Figure 1 shows the results of the steam reforming of LPG which was performed at 600 °C, during 24 h, in order to analyze the catalytic activity of each sample. It was observed that LaNi (A) presented an initial conversion of 35% but deactivated after only 5 hours of reaction, probably due to carbon deposition. LaNi/CS (B) had an average initial LPG conversion of 40%, but after 24 h of reaction the conversion dropped to 20%. Coke might also have been the main responsible for the progressive deactivation observed, despites the oxygen mobility of the support which helps the gasification of deposited carbon. Average LPG conversion was 55% for LaNi/AL (C), which was the most active and stable catalyst, probably due to a better Ni dispersion obtained for this sample. TGA tests were performed after the stability tests and confirmed coke deposition over all catalysts, especially LaNi that showed the highest carbon formation rate.

Hydrogen production from the steam reforming of liquefied petroleum gas (LPG) over supported perovskites

2019 Spring National Meeting

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