Key Takeaways & Executive Findings
- •• • K+ doping in MnOx enhances oxygen vacancy concentration, lowering toluene oxidation T90 by ~20°C (from 250°C to 230°C) as reported by Huang et al. (2024), improving low-temperature activity for industrial off-gas treatment. • • CoMn2O4 catalysts exhibit dual activation of lattice and molecular oxygen via oxygen vacancies, achieving >90% VOC conversion at 220°C (Ren et al., 2024), enabling energy-efficient combustion. • • Cu-OMS-2 materials, characterized by XAS and cyclic voltammetry (Ramstad & Mikkelsen, 2004), show enhanced redox properties, with Cu incorporation increasing oxygen mobility and lowering activation energy for aromatic VOC oxidation. • • Pt/MnO2 catalysts with strong metal-support interactions achieve total toluene oxidation at 150°C (Mo et al., 2019), demonstrating that noble metal loading on MnO2 drastically reduces operating temperature, improving cost-effectiveness despite Pt cost.
Abstract
Volatile organic compounds (VOCs) from diverse sources severely impact atmospheric environment and human health. Manganese (Mn)-based catalysts, with exceptional structural diversity and abundant redox versatility, are widely used in catalytic combustion of VOCs. This review summarizes the catalytic performance of various Mn-based catalysts, emphasizing preparation strategies for high-performance materials and systematically analyzing how active site construction influences VOC combustion. Catalytic oxidation mechanisms are expounded in detail. Key aspects include MnOx polymorphs, doping with alkali metals (e.g., K+), transition metal composites (Co, Cu), and noble metal loading (Pt, Pd, Au). Performance metrics such as T90 values, oxygen vacancy concentrations, and specific surface areas are discussed. The review provides insights into deactivation mechanisms and anti-poisoning strategies, offering practical guidance for VOC pollution remediation.
1. Introduction
Catalytic combustion is a leading technology for VOC abatement, yet conventional noble metal catalysts (Pt, Pd) suffer from high cost and poisoning susceptibility, limiting industrial scalability. Transition metal oxides, particularly MnOx, offer low-cost alternatives but often require higher operating temperatures. The bottleneck lies in balancing activity, stability, and cost.
This review addresses this by systematically analyzing Mn-based catalysts, including doping, composite formation, and support modification. Strategies such as K+ doping to create oxygen vacancies, CoMn solid solutions for synergistic effects, and noble metal loading to enhance low-temperature activity are critically evaluated. The experimental protocols cited provide quantitative performance data, enabling rational design of high-performance, cost-effective catalysts for VOC remediation.
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LUO Guangjun, CHEN Shuang, YIN Hong, ZENG Jia, XIE Hongmei, ZHOU Guilin (2026). Research Progress on Mn-Based Catalysts for Catalytic Combustion of Volatile Organic Compounds. Journal of Fuel Chemistry and Technology. https://doi.org/10.1016/S1872-5813(26)60645-7
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Frequently Asked Questions
What is the effect of K+ doping on the oxygen vacancy concentration and catalytic activity of MnOx for toluene oxidation?
According to Huang et al. (2024), K+ doping in MnOx increases oxygen vacancy concentration, which enhances lattice oxygen mobility and improves catalytic activity. Specifically, the T90 for toluene oxidation decreased from 250°C to 230°C, a 20°C reduction, demonstrating improved low-temperature performance.
How do CoMn2O4 catalysts achieve dual activation of lattice and molecular oxygen, and what is the resulting performance?
Ren et al. (2024) reported that CoMn2O4 catalysts with oxygen vacancies facilitate dual activation of lattice and molecular oxygen, leading to enhanced VOC oxidation. The catalysts achieved >90% conversion of toluene at 220°C, indicating high activity at moderate temperatures, which is beneficial for energy-efficient industrial applications.
What is the role of Cu incorporation in manganese oxide octahedral molecular sieves (OMS-2) for VOC oxidation?
Ramstad and Mikkelsen (2004) characterized Cu-OMS-2 materials using X-ray absorption spectroscopy and cyclic voltammetry, revealing that Cu incorporation modifies the redox properties and increases oxygen mobility. This enhances the catalytic performance for total oxidation of aromatic VOCs, as evidenced by improved conversion rates at lower temperatures compared to pure MnO2.
How does strong metal-support interaction in Pt/MnO2 catalysts affect toluene oxidation activity?
Mo et al. (2019) demonstrated that Pt/MnO2 catalysts with strong metal-support interactions achieve total toluene oxidation at 150°C, significantly lower than typical MnOx catalysts. This interaction stabilizes Pt nanoparticles and promotes oxygen activation, enabling high activity at low temperatures, which is crucial for energy savings in VOC abatement.
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