Effect of Inserting K + in Enhancing Toluene Catalytic Oxidation Over Manganese‐Based Monolithic Catalysts: Structural Additives and Electronic Modulation

ABSTRACT Based on the role of alkali metal K + in contributing to the structural tune and electronic regulation of transition metal oxides, a series of K + ‐modified MnCe/HATP/cordierite monolithic catalysts were prepared and evaluated for catalytic oxidation of toluene. The introduction of K + reduced the crystal structure of Mn 2 O 3 by interacting with the Mn‐O bond and improved the specific surface area of the catalysts. Furthermore, the presence of K + enhanced the interaction between Ce and Mn (Ce 4+ + Mn 3+ ↔ Ce 3+ + Mn 4+ ). This increased the content of Mn 4+ and oxygen vacancies, promoting activation of oxygen and reducibility of the catalysts. Among them, 3% K/MnCe/HATP/cordierite exhibited the best catalytic activity, with the T 90 of toluene was 264°C. These findings provided valuable insight for the design and development of manganese‐based monolithic catalyst.