Preparation of Mn-Fe Oxide by a Hydrolysis-Driven Redox Method and Its Application in Formaldehyde Oxidation

Jie Ling; Yaxin Dong; Pan Cao; Yixiang Wang; YingYing Li

doi:10.1021/acsomega.1c02994

Preparation of Mn-Fe Oxide by a Hydrolysis-Driven Redox Method and Its Application in Formaldehyde Oxidation

ACS Omega. 2021 Sep 1;6(36):23274-23280. doi: 10.1021/acsomega.1c02994. eCollection 2021 Sep 14.

Authors

Jie Ling¹, Yaxin Dong², Pan Cao², Yixiang Wang², YingYing Li²

Affiliations

¹ College of Coal and Chemical Industry, Shaanxi Energy Institute, Hsienyang 712000, China.
² College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China.

Abstract

Homogeneous distribution of Mn-Fe oxides (xMn1Fe) with different Mn/Fe ratios was synthesized by a hydrolysis-driven redox method, and their catalytic activities in HCHO oxidation were investigated. The results showed that HCHO conversion was significantly improved after doping iron due to the synergistic effect between manganese and iron. The 5Mn1Fe catalyst exhibits excellent catalytic activity, achieving >90% HCHO conversion at 80 °C and nearly 100% conversion at 100 °C. The physicochemical properties of catalysts were characterized by BET, XRD, H₂-TPR, O₂-TPD, and XPS techniques. Experimental results revealed that the introduction of Fe into MnO _x resulted in a large surface area, a high ratio of Mn⁴⁺, abundant lattice oxygen species and oxygen vacancy, and uniform distribution of Mn and Fe, thus facilitating the oxidation of HCHO to CO₂ and H₂O.