Ni nanoparticles prepared from Ce substituted LaNiO3 for the guaiacol conversion
•Ni-reduced nanoparticles were prepared from La1−xCexNiO3 perovskite-type oxides.•Catalysts displayed a high conversion of guaiacol.•Cyclohexanol compound was the main product.•Selectivity was unaffected by variation in Ce content of the perovskite catalysts.
The effect of the substitution of cerium on the catalytic conversion of guaiacol over Ni-based catalysts prepared from the reduction of La1−xCexNiO3 perovskite-type oxides (0.0 ≤ x ≤ 0.9) has been investigated. The thermal behavior under reductive atmosphere indicates a beneficial effect of Ce addition. The characterization of the calcined La1−xCexNiO3 perovskites and reduced Ni-based catalysts by atomic absorption spectroscopy (AAS), adsorption of N2 (−196 °C), transmission electron microscopy (TEM), X-ray powder diffraction and temperature programmed reduction (TPR) revealed significant differences in crystalline structure and reducibility. The Ni-reduced materials were effective in catalyzing the conversion of guaiacol to cyclohexanol. The catalysts with Ce content x ≤ 0.3 displayed similar initial intrinsic rate. The highest activity was obtained for the catalysts with Ce content x = 0.5 and 0.7 which was ascribed to the highest thermal stability under reductive atmosphere of CeO2-solid solution partially substituted with La. The Ni-reduced catalysts displayed a high selectivity to cyclohexanol and methoxycyclohexanol compounds and the catalysts with XCe = 0.5 presented a high stability in the guaiacol conversion.
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Journal: Applied Catalysis A: General - Volume 481, 5 July 2014, Pages 1–10