Acta Chim. Sinica ›› 2019, Vol. 77 ›› Issue (2): 160-165.DOI: 10.6023/A18090401 Previous Articles     Next Articles



唐思群a,b, 马玲玲a, 罗敏a, 张朝晖c, 邱烨c, 冯烁c, 夏传琴b, 金永东b, 徐殿斗a   

  1. a 中国科学院高能物理研究所核技术应用研究中心 北京 100049;
    b 四川大学化学学院 成都 610064;
    c 北京出入境检验检疫局检验检疫技术中心 北京 100026
  • 投稿日期:2018-09-25 发布日期:2018-12-05
  • 通讯作者: 马玲玲,;徐殿斗,;
  • 基金资助:


Heterogeneous Reaction of NH3 and Cl2 on the Surface of γ-Al2O3 Particles

Tang Siquna,b, Ma Linglinga, Luo Mina, Zhang Zhaohuic, Qiu Yec, Feng Shuoc, Xia Chuanqinb, Jin Yongdongb, Xu Diandoua   

  1. a Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049;
    b College of Chemistry, Sichuan University, Chengdu 610064;
    c Beijing Entry-Exit Inspection and Quarantine Bureau Technology Centre, Beijing 100026
  • Received:2018-09-25 Published:2018-12-05
  • Contact: 10.6023/A18090401;
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. U1832212, 11405184, 11575210, 91643206) and the Key Deployment Projects of Chinese Academy of Sciences (No. ZDRW-CN-2018-1).

The effect of NH3 concentration, reaction time and other conditions on the heterogeneous reaction of NH3 and Cl2 on the surface of γ-Al2O3 particles was investigated at the room temperature, pressure and in the presence of oxygen by ion chromatography (IC). The formation of the surface species (Cl-, NO3-, and SO42-) via both individual reaction and co-existing reaction of NH3, Cl2, SO2 and NO2 on the surface of γ-Al2O3 was investigated as well. The results revealed that NH3 (400 ppm) and Cl2 (400 ppm) had synergistic effect on the surface γ-Al2O3, and the total yield of Cl- was 589.65 μg after reaction of 2 h. The formation of the surface chlorides increased firstly and then decreased with the increase of ammonia concentration, and the maximum yield of Cl- was reached at 400 ppm of NH3. In the presence of active chlorine, NH3 significantly promoted the generation of the adsorptive species on the surface, such as Cl-, NO3- and SO42-, and the most obvious synergistic effect was induced to form on the conditions of four gases co-existence. The heterogeneous reaction mechanism of NH3 with Cl2 and the influence on the atmospheric environment were also discussed as well. Additionally, the mixing ratios used in the study are extremely high compared with ambient levels, which could be as a simulation to explore whether the synergistic effect obtained in this paper are also present in the real ambient conditions. We have studied a relatively low mixing ratios for heterogeneous reaction experiments, but the content of nitrate and chloride on the surface of γ-Al2O3 were lower than the limit of detection of ion chromatography. Therefore, other researches such as Knudsen cell and smog chamber study, field monitoring, and mode study are also worth for exploring in future study. The results of this study could provide reference data for the study of the contribution of active chlorine and ammonia to the formation of secondary inorganic particles.

Key words: heterogeneous reaction, secondary inorganic particles, NH3, Cl2