Effect of EDTA in preparation of Ni catalysts toward a carbon resistant ethanol reforming

A. C.VILLAGRAN OLIVARES; MANUEL F. GOMEZ; C. A. LOPEZ; M.N. BARROSO; M. CRISTINA ABELLO

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2020 vol. 264

0926-3373

Ni supported catalysts were prepared by an EDTA complexing method with different EDTA/Ni molar ratios: 0-2. The catalysts were characterised by X-ray diffraction, adsorption-desorption isotherms of N2, infrared spectroscopy, thermogravimetric analysis, temperature programmed reduction and X-ray photoelectron spectroscopy. All the catalysts prepared with EDTA presented a decrease in the NiO particle size of around 60% with respect to the sample obtained in the absence of a chelating agent. Besides, the EDTA/Ni = 1 catalyst corresponding to the complete Ni chelation showed a Ce3+/Ce4+ high surface ratio. The greater extent of surface reduction of CeO2 suggests changes in the NiO-CeO2 interaction induced by the presence of the chelating agent duringpreparation. The NiEDTA(1) sample showed the best performance in the ethanol steam reforming reaction at 650°C. An ethanol conversion of 100% was reached after seven hours reaction with a high yield of hydrogen and a low carbon deposition rate