Green synthesis method of lanthanum-based perovskite

Abstract

The invention discloses a green synthesis method of lanthanum-based perovskite. The method includes the steps that firstly, phyteral is extracted with water, and a phyteral extracting solution is prepared; lanthanum nitrate and metal salt are added into the phyteral extracting solution, after the materials are stirred and dissolved, the materials are dried, the materials are calcined at the low temperature, and the lanthanum-based perovskite is obtained. According to the synthesis method, the raw material content is rich, the raw materials are cheap and easy to obtain, regeneration is easy, the process is simple, operation is convenient, a pure-phase perovskite type oxide can be obtained at the low calcination temperature (500 DEG C), and industrial production of the perovskite type oxideis promoted.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite-type oxides, and in particular relates to a green synthesis method of lanthanum-based perovskite. Plant matter is used as a raw material and calcined at a relatively low temperature to greenly synthesize lanthanum-based perovskite. Background technique [0002] Perovskite oxide (general formula: ABO 3 ) is a class of composite oxides with special structure and physical and chemical properties, and has been widely used and researched in many fields such as catalysis, sensors, and solid fuel cells. Especially in the field of heterogeneous catalysis, perovskite-type oxides not only have "chemical tailorability", that is, by adjusting the elemental composition of A-site or B-site, their catalytic performance can be adjusted or given new catalytic performance, but also It is cheap and easy to obtain, and it is expected to become a catalytic material to replace noble metal catalysts s...

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Problems solved by technology

These traditional synthesis methods mainly have two deficiencies: on the one hand, the synthesis of pure phase LaMO 3 The required temperature is relatively high. For example, the temperature required by the high-temperature solid-phase method is generally above 1000 ° C, and the temperature required by the liquid-phase method is generally above 700 ° C; on the other hand, the synthesis of LaMO 3 The process is more complicated, the equipment requirements are higher, and the cost is relatively high, such as freeze-drying, spray-drying, reaction ball milling, template method, etc.

It has been reported that perovskite-type LaCoO with relatively pure crystal phase was obtained by calcination at a lower temperature (500°C) by electrospinning with glucose as an auxiliary agent. 3 , which significantly reduces the synthesis temperature of perovskite-type oxides, but the electrospinning method still has problems such as low efficiency and many influencing factors, and there is still a certain distance from industrial production

In addition, the complex combustion method of bagasse and metal salts was used to prepare perovskite structure LaCoO 3 Although the report of composite metal oxide materials can simplify the synthesis process and reduce the preparation cost, this method prepares LaCoO 3 The process also needs a pre-decomposition (400°C, 2h) process, and the final calcination temperature is 600-800°C, the synthesis process is relatively cumbersome, and the calcination temperature is relatively high

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