One-step hydrothermal synthesis of LaFeO3 perovskite for methane steam reforming

Abstract

This work describes the synthesis of LaFeO 3 oxide, using a one-step hydrothermal synthesis route, to obtain a solid exhibiting superficial, morphological and textural properties useful for potential applications. The synthesis process starts from corresponding metal nitrates of lanthanum and iron in well-defined concentration and KOH as mineralizing agent. The reaction is developed in a Teflon-lined stainless steel autoclave at 300 °C for 14 days. The composition and surface area were determined with X-ray fluorescence (XRF) and nitrogen adsorption isotherms (BET), verifying the obtaining of a stoichiometric, high, and active phase of oxide. The crystalline structure was evaluated with X-ray diffraction analysis (XRD), showing a pure orthorhombic perovskite phase. TPR results show the development of three single steps at different temperatures, kinetically detectable and related with reduction of component oxides. Scanning and transmission electron microscopy (SEM-TEM) results showed a remarkable degree of crystallization, favouring a specific morphology as a result of the low consolidation temperature of the perovskite phase. Catalytic test by means of methane reaction, performed along 240 on stream, reveals a light deactivation rate, decreasing progressively 7.1% until 60% of methane conversion, indicating the improved morphological and surface characteristics for potential applications.

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

“…Moreover, LFO are known to show multiferroic behaviour that is the co-existence of both ferroelectric and ferro/ferri-magnetic or antiferromagnetic properties. [4] Different methodologies are there in the literature to synthesize LFO NPs like co-precipitation method, [5] solution autocombustion method, [6] sonochemical method, [7] sol-gel technique, [8] hydrothermal method, [9] Reverse Microemulsion method, [10] polymerizable complex method, [11] thermal decomposition, [12] solid-state reaction [13] and many more. Among these, the solution autocombustion method offers lots of advantages.…”

A Review on Synthesis, Properties, and Environmental Application of Fe-Based Perovskite

“…In this method, crystalline structure is obtained for nanomaterials without calcinations. Gómez-Cuaspud et al synthesized pure phase LaFeO 3 Perovskite by the hydrothermal method without calcinations [26]. Single crystal BiFeO 3 microplates were developed by hydrothermal method using C 6 H 10 BiNO 8 as reductant and surface modifier [27].…”

Smart Designs of Anti-Coking and Anti-Sintering Ni-Based Catalysts for Dry Reforming of Methane: A Recent Review

“…Represented by the formula ABO 3 , perovskite structures have been widely investigated in heterogeneous catalysis at high temperatures due to its good thermal stability [91][92][93][94][95][96][97]. By substitution of A-site ions, the dimension of unit cells changes, thus changing the covalence of B-O bond accordingly, resulting in a lattice defect formation.…”