Mao Yan-Peng, Chen Hua, Long Xiang-Li, Xiao Wen-de, Li Wei, Yuan Wei-Kang
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
J Hazard Mater. 2009 Feb 15;162(1):99-102. doi: 10.1016/j.jhazmat.2008.05.028. Epub 2008 May 13.
Ammonia solution can be used to scrub NO from the flue gases by adding soluble cobalt(II) salts into the aqueous ammonia solutions. The hexamminecobalt(II), Co(NH3)6(2+), formed by ammonia binding with Co2+ is the active constituent of eliminating NO from the flue gas streams. The hexamminecobalt(II) can combine with NO to form a complex. For the development of this process, the data of the equilibrium constants for the coordination between NO and Co(NH3)6(2+)over a range of temperature is very important. Therefore, a series of experiments were performed in a bubble column to investigate the chemical equilibrium. The equilibrium constant was determined in the temperature range of 30.0-80.0 degrees C under atmospheric pressure at pH 9.14. All experimental data fit the following equation well: [see text] where the enthalpy and entropy are DeltaH degrees = - (44.559 +/- 2.329)kJ mol(-1) and DeltaS degrees = - (109.50 +/- 7.126) J K(-1)mol(-1), respectively.
通过向氨水溶液中添加可溶性钴（II）盐，氨溶液可用于从烟道气中脱除一氧化氮。氨与Co2+结合形成的六氨合钴（II），即Co(NH3)6(2+)，是从烟道气流中消除一氧化氮的活性成分。六氨合钴（II）可与一氧化氮结合形成络合物。对于该工艺的开发，一氧化氮与Co(NH3)6(2+)之间配位的平衡常数在一定温度范围内的数据非常重要。因此，在鼓泡塔中进行了一系列实验以研究化学平衡。在常压、pH值为9.14的条件下，在30.0 - 80.0摄氏度的温度范围内测定了平衡常数。所有实验数据与以下方程拟合良好：[见原文]，其中焓和熵分别为ΔH° = - (44.559 ± 2.329)kJ mol(-1)和ΔS° = - (109.50 ± 7.126) J K(-1)mol(-1)。
