Synthesis and Characterization of LaNiO3, LaNi(1-x)Fe xO3 andLaNi(1-x)Co xO3 Perovskite Oxides for Catalysis Application

Abstract

Mixed metal oxides with perovskite-type structure show a great potential to be used in catalysis, electrocatalysis and electronic ceramics. Perovskites oxides catalysts with the composition LaNiO 3 , LaNi (1-x) Fe x O 3 and LaNi (1-x) Co x O 3 (x = 0.4 and 0.7) have been synthesized by the precipitation method to be used in the methane reforming to produce hydrogen and synthesis gas. The compounds were characterized by X-ray diffraction, thermogravimetric and differential thermal analysis, inductively coupled plasma atomic emission spectroscopy, surface area measurements, energy dispersive X-ray spectrometry coupled to scanning electron microscopy and temperature programmed reduction. The results showed that a suitable combination of the preparation method with calcination variables (time and temperature) could result in oxides with the desired structure and with important properties at the application point of view in heterogeneous catalysis.

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

“…The first weight loss below 110°C in correlation with a broad endothermic peak corresponds mainly to desorption of chemisorbed or hydration water that may remain in the precursor in accordance with previous works [15][16][17]. The second weight loss between 250 and 310°C associating with the two endothermic peaks can be ascribed to the decomposition and burnout of most nitrates in the precursor powder, in agreement with previous reports [18,19]. This hypothesis has been supported by FT-IR spectroscopy results in a former contribution in which further details of the decomposition process is shown in (Fig.…”

Methane reforming to syngas over LaNixFe1−xO3 (0≤x≤1) mixed-oxide perovskites in the presence of CO2 and O2

“…(10) and (11)) could be inhibited by the redox reactions between CH 4 and CO (produced during the dry reforming process) with the lattice oxygen (O x ) at LaNi x Fe 1Àx O 3 surface (Eqs. (12) and (13)) forming H 2 and CO 2 that is thermodynamically unfavorable for formation of carbon species in this range of conditions. Therefore, significant lower amount of carbon deposition were observed for Ni even at low inlet CO 2 concentration.…”

Effective piezoelectric coefficient measurement of BaTiO3 thin films using the X-ray diffraction technique under electric field available in a standard laboratory

“…LaNiO 3 target was synthetized by co-precipitation method [43]. Initially, a solution containing the La 3+ (La(NO 3 ) 3 ,6H 2 O Strem Chemicals, 99.9%) and Ni 2+ (Ni(NO 3 ) 2 ,6H 2 O, Strem Chemicals, 99.9%) ions was prepared with a molar ratio of 1:1.…”