English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Many of the studied catalysts for applications in chemical industry processes are based on mixed metal oxides. The specific preparation of these oxides, which are capable of performing complex functions, is one of the main research topics in the field of heterogeneous catalysis [1]. Among the mixed metal oxides, those with a perovskite structure constitute a family of crystalline ceramic materials of the ABO3-type formula, which have recently been recognized as active catalysts, replacing noble metals [1, 2]. In these oxides, A is a large cation, such as alkali metals, alkaline earths and rare earths and B is a small cation, such as a transition metal. In general, they have well defined structures, the perovskite being ideal cubic type. However, these structures often appear distorted, especially for the orthorhombic and rhombohedral symmetries [3]. It is possible to carry out partial substitutions of cations A and B without changing the fundamental structure of the perovskite [4]. The effect of the partial replacement of the cation A, usually by a rare earth metal, and especially with elements with oxidation state other than +3, has been frequently studied [5-7]. However, interest in perovskite studies is promising in applications involving high temperatures due to their high stability. These materials have been considered important due to their electronic, optical, catalytic properties, among others [8]. The perovskites may present some structural defects, which can occur through the doping of the sites in the crystalline structure, generating excess or vacancy of oxygen [9]. In some cases, doping with Sr at A-site can generate non-stoichiometric perovskites with excess oxygen and cation vacancies [10]. Thus, the influence on the amount of Sr may influence the formation of the spinel structure, Nickel-based perovskite catalysts: synthesis and catalytic tests in the production of syngas