Hierarchical Regulation of LaMnO3 Dual-Pathway Strategy for Excellent Room-Temperature Organocatalytic Oxidation Performance

Weiran Zhu; Nan Hao; Chen Chen; Yu Qiu; Yanli Zuo; Jie Wei; Jing Qian; Kun Wang

doi:10.1021/acs.inorgchem.2c00521

Hierarchical Regulation of LaMnO₃ Dual-Pathway Strategy for Excellent Room-Temperature Organocatalytic Oxidation Performance

Inorg Chem. 2022 May 16;61(19):7459-7466. doi: 10.1021/acs.inorgchem.2c00521. Epub 2022 Apr 29.

Authors

Weiran Zhu¹, Nan Hao¹, Chen Chen¹, Yu Qiu¹, Yanli Zuo¹, Jie Wei¹, Jing Qian¹, Kun Wang¹

Affiliation

¹ Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.

PMID: 35486826
DOI: 10.1021/acs.inorgchem.2c00521

Abstract

The performance-enhancing strategy of a single pathway for perovskite has been widely studied. In this work, the dual-pathway strategy of A-site Ce substitution and nitric acid selective dissolution was proposed. The catalytic oxidation performance of LaMnO₃ exhibits the characteristic of hierarchical regulation, that is, a steplike improvement, which avoids the limitation of performance improvement of the single pathway. The B-site Mn with catalytic activity was in situ reconstituted on the surface to build a Mn-rich surface. The obtained sdLa_0.7Ce_0.3MnO₃ has the advantages of good oxygen mobility, high Mn⁴⁺/Mn³⁺ molar ratio, and large specific surface area, and this material showed excellent catalytic oxidation performance for organics, which can realize colorimetric chemical oxygen demand detection at room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio of Mn⁴⁺/Mn³⁺, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased the specific surface area.