Effect of Formaldehyde on the Heterogeneous Reaction of Nitrogen Dioxide on 纬-Alumina

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• 作者：Zhenyu Sun ; Lingdong Kong ; Xi Zhao ; Xiaoxiao Ding ; Hongbo Fu ; Tiantao Cheng ; Xin Yang ; Jianmin Chen
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：September 3, 2015
• 年：2015
• 卷：119
• 期：35
• 页码：9317-9324
• 全文大小：369K
• ISSN：1520-5215

文摘

Heterogeneous reactions of NO₂ on various mineral aerosol particles have been investigated in many previous studies, but a fundamental understanding of how the adsorption of formaldehyde influences the heterogeneous reactions of NO₂ remains unclear. In this work, the effect of formaldehyde preadsorption on heterogeneous reaction of NO₂ on the surface of 纬-Al₂O₃ at 298 K and ambient pressure was investigated by using diffuse reflectance infrared Fourier transform spectrometry (DRIFTS). It was found that the preadsorption of HCHO on 纬-Al₂O₃ could suppress the formation of nitrate, and the rate of nitrate formation decreased with increasing amount of preadsorbed HCHO, whereas the following heterogeneous uptake of NO₂ could suppress the hydration reaction of HCHO and promote the production of HCOO^{鈥?/sup> during the reaction. Surface nitrite was formed and identified to be an intermediate product and gradually disappeared as the reaction proceeded. The amount of the formed nitrite decreased when the amount of HCHO increased. Uptake coefficients of heterogeneous reactions were calculated and found to be sensitive to the adsorption of HCHO. A possible mechanism for the influence of HCHO adsorption on the heterogeneous conversion of NO₂ on 纬-Al₂O₃ was proposed, and atmospheric implications based on these results were discussed.}