Revealing the Role of MnO 2 Phase Structure for Efficient Oxidation of Formaldehyde at Room Temperature
Source abstract
Abstract
ABSTRACT The crystal‐phase‐dependent oxidation of formaldehyde (HCHO) over MnO 2 remains insufficiently understood in indoor air purification. Herein, the MnO 2 with different crystal phases (δ‐MnO 2 , α‐MnO 2 , and ε‐MnO 2 ) was synthesized to establish a phase–structure–activity relationship for efficient HCHO mineralization at room temperature. Correspondingly, the optimal 98.07% conversion of HCHO could be achieved, and the maximum mineralization rate for CO 2 reached 88% for δ‐MnO 2 in 30 min. Structural analyses confirmed their distinct architectures, with δ‐MnO 2 exhibiting the highest Mn 4+ /Mn 3+ ratio, the largest amount of chemisorbed oxygen, and the lowest oxygen desorption temperature, reflecting superior redox cycling and oxygen activation. The results of in situ DRIFTS tests revealed a minimized accumulation of dioxymethylene and formate intermediates on the surface of δ‐MnO 2 , consistent with accelerated oxidation kinetics. Besides, DFT calculations further indicated the strongest HCHO adsorption and highest charge transfer over MnO 2 , which intrinsically promotes the deep oxidation of HCHO. This work elucidates the decisive role of crystal‐phase regulation in adjusting redox processes for room‐temperature formaldehyde mineralization.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Chemical Looping and Thermochemical Processes · Catalysis and Oxidation Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Hubei Key Laboratory of Mineral Resources Processing and Environment Key Laboratory of Green Utilization of Critical Non‐Metallic Mineral Resources Ministry of Education State Key Laboratory of Silicate Materials For Architectures Wuhan University of Technology Wuhan China
Funding
National Natural Science Foundation of China
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