Study on Accelerating the Activation of Ferromanganese Ammonia-Nitrogen Nitrosation Catalyst
XU Xiaorui1, MO Hengliang2,*, TANG Yang1, LIU Manman2, HOU Wanyi1, LI Suoding2, ZHAO Wenfang2, YANG Hengyu2, WAN Pingyu1,*
1 National Basic Research Laboratory of New Hazardous Chemicals Assessment and Accident Identification, School of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China 2 Beijing Origin Water Membrane Technology Co., Ltd., Beijing 101400, China
Abstract: Using manganese salt, iron salt and trace elements as raw materials, a ferromanganese catalyst which can oxidize NH4+ to NO2- by using dissolved oxygen in water after 150 h activation period was prepared. The analysis and characterization results of the micro-properties changes of the catalysts before and after activation showed that the morphology of the catalysts did not change significantly, but the Zeta potential of the catalysts after activation became significantly negative, which was more favorable for positively charged NH4+ to adsorb on its surface. The phase composition was analyzed. The results showed that the catalyst is a manganese-iron composite oxide composed of δ-MnO2 and Fe2O3, and the phase peaks of δ-MnO2 and Fe2O3 increase after activation. In addition, in the activated ammonium catalyst, Mn(Ⅱ) decreased and Mn(Ⅳ) increased, FeOOH decreased and Fe2O3 increased, oxygen carbonate decreased and adsorbed oxygen increased. In view of the changes of species and microscopic properties in the activation process, the unactivated catalyst was soaked in NaClO solution to accelerate the transformation of Mn(Ⅱ) to Mn(Ⅳ), which could shorten the activation time from 150 h to 85 h. The activation time can be shortened from 150 h to 100 h by promoting the conversion of FeOOH to Fe2O3 by heating dehydration.
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2023, Vol. 37 
