Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

Abstract

Lanthanum orthoferrite powders were synthesized via one-step hydrothermal reactions under mild conditions using microwave and conventional heating. The use of microwave irradiation during the synthesis allows one to obtain nanocrystalline LaFeO 3 with a higher yield and reduced crystallite and particle size within a 16 times shorter duration (3 hours) at a lower temperature of 220°C as compared to the conventional heating. The catalytic decomposition of nitrous oxide was performed over both samples, it was shown that the sample obtained under microwave conditions demonstrates enhanced activity as a catalyst: N 2 O decomposes completely at 700°C over the catalyst formed at microwave conditions, while the comparative catalyst prepared by conventional heating reaches a lower conversion of only 60% at the same temperature and catalytic reaction conditions.

Tuning the A‐site Element in LaCo0.8Fe0.2O3 Perovskite‐based Catalyst for High Temperature N2O Decomposition in Nitric Acid Plant

“…Umicore also developed various perovskite‐based formulations [19] . Recently, hydrothermal microwave‐synthesized LaFeO 3 catalyst [9b] and La 0.75 Sr 0.25 CoO x , SrCo 0.81 Fe 0.19 O x and their mixture have also been investigated for N2O decomposition [20] . However, it should be mentioned that most of those studies were carried out under moderate conditions where steam and NO x content in the reaction mixture is far away from the real exhaust gas.…”

Recent Studies on the Application of Microwave-Assisted Method for the Preparation of Heterogeneous Catalysts and Catalytic Hydrogenation Processes

“…Replacing classical thermal heating with microwave heating is a good alternative in a wide range of chemical syntheses, especially in the cases where long-term synthetic experiments are required [6]. Over the past few years, the use of microwave irradiation has become one of the latest achievements in the field of green chemistry, as microwave heating is considered as a more efficient way to control heating in many processes, as it requires less energy than conventional methods and the microwave technology also allows the use of environmentally friendly solvents, resulting in clean products that do not require additional purification steps [7][8][9][10][11]. The use of microwave heating has expanded with the introduction of a number of environmental techniques through the use of ionic liquids and aqueous media that do not contain organic solvents and catalysts [12,13].…”

Microwave Synthesis of Copper Phyllosilicates as Effective Catalysts for Hydrogenation of C≡C Bonds

“…On the other hand, the development of chemical technology requires the use of new, modern approaches to the synthesis of materials. The use of the microwave (MW) irradiation during the synthesis of catalytic systems can significantly accelerate the decomposition of the precursors used subsequently reducing the preparation time, which, in some cases, can also lead to a decrease in the size of the deposited particles in comparison with conventional synthesis methods [ 17 , 18 , 19 ].…”