Chemical looping-based energy transformation via lattice oxygen modulated selective oxidation

Abstract

Modulating anionic oxygen in metal oxides offers exceptional opportunities for energy material synthesis via redox looping; however, several challenges such as overoxidation and catalyst deactivation need to be solved. This paper provides an overview of the state-of-the-art schemes for the selective synthesis of valuable chemicals via lattice oxygen-induced redox looping. Compared with previously published works, this review focuses on lattice oxygen modulated energy transformation technologies via chemical looping. This review discusses the chemical looping-based selective oxidation of methane to syngas/methanol, the oxidative coupling of methane, oxidative steam reforming of alcohols, and the oxidative dehydrogenation of hydrocarbons in the lattice oxygen-induced selective oxidation section. Additionally, moderate- and low-temperature Ellingham diagrams are extended to deduce the reactivity of the lattice oxygen based on thermodynamic calculation, which helps for oxygen carrier selection and product modulation. Moreover, less-researched but potential approaches to produce value-added energy materials by lattice oxygen are proposed in the perspective section, including selective oxidation of glycerol to glyceric acid, selective oxidation of methanol to acetic acid, and oxidative methane aromatization. Finally, implications for advanced oxygen carrier material design, preparation, and characterization are also overviewed. This study expands the scope of the lattice oxygen regulated energy conversion, which seeks to benefit both fundamental research and industrial applications of value-added energy material generation via lattice oxygen modulated energy transformation.