Syngas production from ethanol dry reforming using La1-xKxCuO3 perovskite: The effect of potassium promoter
DOI:
https://doi.org/10.15282/jceib.v12i2.8961Keywords:
Ethanol dry reforming, Syngas, Perovskite, Rare earth, PotassiumAbstract
Ethanol dry reforming converts renewable feedstocks and carbon dioxide into valuable syngas, offering a promising pathway for carbon utilization. This study evaluated potassium-promoted lanthanum-copper perovskite catalysts (La1-xKxCuO3, x = 0.25 – 1.0) to modulate product distribution for downstream industrial applications. Synthesized via the citrate sol-gel method, the catalysts were tested in a flow tubular reactor between 973 K and 1073 K and characterized using Fourier transform infrared spectroscopy (FTIR), temperature-programmed reduction (TPR), X-ray diffractometer (XRD), scanning electron microscope with energy-dispersive X-ray spectroscopy (SEM-EDX) and X-ray photoelectron spectroscopy (XPS). Characterization confirmed the successful incorporation of potassium into a single crystalline phase with a linear expansion of lattice parameter for . Specifically, La0.50K0.50CuO3 exhibited a singular reduction peak at 323°C in, reflecting structural homogeneity. XPS verified the oxidation states of surface copper, lanthanum, and potassium species, while SEM-EDX revealed distinct carbon deposition patterns on spent samples. Catalytic results indicated that increasing potassium loading decreased reactant conversions following an exponential decay trend. Nevertheless, potassium modification successfully tailored gas production ratios. All promoted formulations maintained H2/CO molar ratios above unity, benefiting subsequent synthesis steps. Optimal syngas quality was achieved using the La0.75K0.25CuO3 catalyst, yielding an H2/CO ratio between 1.5 and 1.6. These findings demonstrate that alkali cation substitution provides a precise control mechanism for syngas stoichiometry in green reforming processes.
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