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氨基多羧酸螯合铁催化氧化硫化氢实现了铁基催化剂的循环利用,其中催化剂亚铁离子再生是整个脱硫技术的核心。再生过程中,由于反应速率常数比值的不同,Fe2+的反应级数出现1级、2级乃至其间变化的各种结果;分子氧(O2)及其衍生物(如:超氧化物(Hn+O-·2)、过氧化氢(H_2O_2)、羟基自由基(OH·))或高价的含氧铁中间体(如(L)Fe4+=O、(L+)Fe4+=O和(L)nFe4+(OH)(OOH))均可以氧化亚铁离子;典型配体EDTA、HEDTA和NTA螯合亚铁的氧化机制是一致的。再生过程中配体有一个适宜的p H范围,配体NTA过量时,其活性依赖p H和NTA的浓度,NTA量的差别导致不同的反应途径。同时,由于氧化过程中配体消耗了过量的氧导致螯合铁发生降解,从而造成化学反应计量数的偏差。
Aminopolycarboxylic acid chelated iron catalyzed oxidation of hydrogen sulfide to achieve the recycling of iron-based catalysts, of which ferrous ion regeneration catalyst is the core of the entire desulfurization technology. In the process of regeneration, the reaction order of Fe2 + appears various changes in the first order, the second order and even during the reaction due to the different ratios of reaction rate constants. The molecular oxygen (O2) and its derivatives (such as Hn + O (L) Fe4 + = O, (L +) Fe4 + = O and (L) nFe4 + (OH)) or expensive iron oxide intermediates such as (2) hydrogen peroxide ) (OOH) could oxidize ferrous ions. The oxidation mechanism of typical ligand EDTA, HEDTA and NTA chelated ferrous is consistent. During regeneration, the ligand has a suitable p H range. When the ligand NTA is in excess, its activity depends on the concentration of p H and NTA, and the difference of NTA leads to different reaction pathways. At the same time, the chelating iron is degraded due to excessive consumption of oxygen by the ligand in the oxidation process, resulting in deviation of the chemical reaction measurement.