The study of the performance of Ni-based catalysts obtained from LaNiO3 perovskite-type oxides synthesized by the combustion method for the production of hydrogen by reforming of ethanol

• Published in: Catalysis today Vol. 213; pp. 25 - 32
• Main Authors: da Silva, Andressa A.A., da Costa, Lídia O.O., Mattos, Lisiane V., Noronha, Fábio B.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.09.2013; Elsevier
• Subjects: carbon; Catalysis; catalysts; catalytic activity; Chemistry; combustion; Combustion method; ethanol; Ethanol conversion reactions; Exact sciences and technology; gasification; General and physical chemistry; hydrogen; Hydrogen production; Nickel catalyst; oxides; oxygen; Perovskite-type oxides; scanning electron microscopy; steam; temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; thermogravimetry; X-ray diffraction; Ethanol conversion reactions; Nickel catalyst; Combustion method; Perovskite-type oxides; Hydrogen production; Ethanol; Perovskite type compound; Hydrogen; Alcohol; Oxides; Transition metal; Combustion; Reforming; Conversion; Heterogeneous catalysis; Alkanol; Nickel; Catalyst
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2013.04.033

LaNiO3-0.7 after SR of ethanol at 1073K is quite stable and did not exhibit carbon formation. •LaNiO3 perovskite-type oxides were prepared by the self combustion method.•Fuel-to-oxidizers ratio (φ) and reaction conditions affected activity and stability.•Carbon was formed during steam reforming of ethanol at 773K for all catalysts.•Decreasing φ reduced the amount of carbon formed due to smaller Ni crystallite size.•The addition of water or oxygen to the feed inhibits carbon formation at 1073K. The performance of Ni-based catalysts synthesized by the combustion method, using different fuel-to-oxidizers ratios (φ), for ethanol conversion reactions was investigated. All catalysts were selective to hydrogen for steam reforming (SR) of ethanol. Regardless of the φ value, all catalysts deactivated during SR of ethanol at 773K. Scanning electron microscopy and thermogravimetric analyses showed that the loss of activity was due to carbon deposition. However, decreasing φ reduced the amount of carbon formed. This was related to the smaller crystallite size of metallic Ni obtained for the sample with lower φ, as revealed by X-ray diffraction experiments. On the other hand, the catalysts were very stable at high reaction temperature (1073K). The occurrence of the reverse of Boudouard reaction and the carbon gasification reaction inhibited carbon deposition. Furthermore, the presence of water or oxygen in the feed promoted the mechanism of carbon removal and catalyst stability.