Performance and stability of La_(0.5)Sr_(0.5)CoO_(3-δ) perovskite as catalyst precursor for syngas production by partial oxidation of methane

摘要

The aim of this work was to investigate the performance and stability of the perovskite La_(0.5)Sr_(0.5)CoO_(3-δ), as a potential catalyst precursor, for the synthesis gas production by partial oxidation of methane. For this purpose, the catalytic activity of La_(0.5)Sr_(0.5)CoO_(3-δ) was studied as a function of the temperature, flow rate and feed composition. In addition, its stability with the time-on-stream and redox cycles was also explored. Before and after testing, the catalyst precursor was characterized by X-ray diffraction, SEM-EDX and specific surface area (BET). The results evidenced a remarkable catalytic activity due to the stability of the cobalt, which is in a highly disperse state, in its reduced state. The CH_4 conversion and the CO and H_2 selectivities were enhanced with the increase of redox cycles. Finally, the precursor was totally regenerated to the initial perovskite structure under a specific thermal treatment.