Scholarlink

<p>Secondary inorganic aerosols, particularly sulfate and nitrate, are major components of fine particulate matter (PM<sub>2.5</sub>) and play a key role in air quality degradation. Although heterogeneous SO<sub>2</sub>–NO<sub>2</sub> reactions have been extensively studied on single mineral oxides, the behavior of combustion-derived ash particles remains insufficiently understood because of their complex multi-component structures. In this study, herbaceous biomass (HB), woody biomass (WB), sewage sludge (SS-GC), and coal-derived ashes (Coal-WH, Coal-MHU, Coal-CEN) were characterized to evaluate compositional variability among combustion-derived ash particles. Heterogeneous sulfate and nitrate formation was then investigated using coal-derived ash samples under controlled laboratory conditions simulating atmospheric exposure. To support the interpretation of multi-component ash behavior, single-oxide experiments were conducted and combined with compositional analysis, including bulk oxide composition and alkalinity indices. The results show that sulfate formation in coal-derived ashes follows the order Coal-WH &gt; Coal-MHU &gt; Coal-CEN and does not correlate directly with Fe content or surface area alone. Instead, adsorption-related properties, redox-active components, and their accessibility within the ash matrix jointly control heterogeneous reactivity. Additional experiments demonstrate that sulfate formation is more strongly enhanced than nitrate under prolonged reaction time, SO<sub>2</sub>-enriched conditions, high humidity, and saline environments, indicating that environmental factors can amplify heterogeneous conversion over the representative Coal-WH ash sample. These findings demonstrate that heterogeneous SO<sub>2</sub>–NO<sub>2</sub> conversion on combustion-derived ash particles is controlled by compositional and structural interactions rather than single-component effects. The results provide mechanistic insight into atmospheric sulfate formation on complex particles and highlight the importance of considering realistic multi-component ash systems in atmospheric chemistry.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of combustion-derived ash composition on heterogeneous SO2–NO2 conversion under simulated atmospheric conditions

  • 期刊论文

  • 发表日期：

    2026年6月2日

查看全文
  • Joo Chang Park,
  • Sang-Phil Yoon

摘要

Secondary inorganic aerosols, particularly sulfate and nitrate, are major components of fine particulate matter (PM2.5) and play a key role in air quality degradation. Although heterogeneous SO2–NO2 reactions have been extensively studied on single mineral oxides, the behavior of combustion-derived ash particles remains insufficiently understood because of their complex multi-component structures. In this study, herbaceous biomass (HB), woody biomass (WB), sewage sludge (SS-GC), and coal-derived ashes (Coal-WH, Coal-MHU, Coal-CEN) were characterized to evaluate compositional variability among combustion-derived ash particles. Heterogeneous sulfate and nitrate formation was then investigated using coal-derived ash samples under controlled laboratory conditions simulating atmospheric exposure. To support the interpretation of multi-component ash behavior, single-oxide experiments were conducted and combined with compositional analysis, including bulk oxide composition and alkalinity indices. The results show that sulfate formation in coal-derived ashes follows the order Coal-WH > Coal-MHU > Coal-CEN and does not correlate directly with Fe content or surface area alone. Instead, adsorption-related properties, redox-active components, and their accessibility within the ash matrix jointly control heterogeneous reactivity. Additional experiments demonstrate that sulfate formation is more strongly enhanced than nitrate under prolonged reaction time, SO2-enriched conditions, high humidity, and saline environments, indicating that environmental factors can amplify heterogeneous conversion over the representative Coal-WH ash sample. These findings demonstrate that heterogeneous SO2–NO2 conversion on combustion-derived ash particles is controlled by compositional and structural interactions rather than single-component effects. The results provide mechanistic insight into atmospheric sulfate formation on complex particles and highlight the importance of considering realistic multi-component ash systems in atmospheric chemistry.