数字农科院2.0

Flowerlike structured Cu promoted MnOx catalysts for VOC oxidation: Enhanced water vapor resistance in simulated coal-fired flue gas

文献类型： 外文期刊

作者： Xiao Zhang;Xueying Zhang;Cai Liang;Feng Shen;Boxiong Shen

作者机构：

关键词： Coal-fired flue gas;O-xylene;Regenerative properties;Water resistance

期刊名称： Fuel

ISSN： 0016-2361

年卷期： 2025 年 399 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Water poisoning remains a significant challenge for Mn-based catalysts in the purification of low-temperature industrial flue gas. In this study, a water-resistant catalyst, Cu-doped MnOx dispersed on a flower-like hollow sphere carrier (Cu0.1Mn1-Al2O3(NF)), was developed. The introduction of 5 % water vapor into simulated flue gas reduced the o-xylene oxidation efficiency of the unmodified MnOx/γ-Al2O3 catalyst by 20 %, whereas Cu0.1Mn1-Al2O3(NF) exhibited only a 5 % reduction, and it shows a water resistance surpasses those of most of the reported MnOx catalysts. Upon water vapor withdrawal, Cu0.1Mn1-Al2O3(NF) showed a 2 % irreversible efficiency loss, compared to 9 % for MnOx/γ-Al2O3. Mechanistic studies highlight the role of the flower-like morphology in reducing hydrogen-bonded H2O and the primary contribution of Cu+ doping in suppressing –OH generation on metal sites, likely due to weakened H2O dissociation at Mn-Ov-Cu oxygen vacancies. Additionally, Cu0.1Mn1-Al2O3(NF) has improved water desorption capability evidenced by 8 °C lower endothermic temperature for H2O volatilization than that of MnOx/γ-Al2O3. Furthermore, a H2O-involved Mars-van Krevelen (MvK) mechanism was proposed to explain the ∼ 2 % irreversible efficiency reduction for Cu0.1Mn1-Al2O3(NF) in wet gas − attributed to H2O dissociation at oxygen vacancies hindered lattice oxygen replenishment. Based on this mechanism, an air-purging regeneration protocol was developed to enhance the catalyst's operational stability under wet flue gas conditions.

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