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Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution
Journal of Nanomaterials Pub Date : 2020-08-01 , DOI: 10.1155/2020/4593054
Manh B. Nguyen 1, 2 , Giang H. Le 1 , Trang T. T. Pham 1, 3 , Giang T. T. Pham 4 , Trang T. T. Quan 1 , Trinh Duy Nguyen 5 , Tuan A. Vu 1, 3
Affiliation  

Catalytic ozonation is a new method used for removal of NH4OH solution. Therefore, high catalytic performance (activity and selectivity) should be achieved. In this work, we report the synthesis and catalytic performance of Fe2O3-Co3O4 modified dolomite in the catalytic ozonation of NH4OH solution. Dolomite was successfully activated and modified with Fe2O3 and Co3O4. Firstly, dolomite was activated by heating at 800°C for 3 h and followed by KOH treatment. Activated dolomite was modified with Fe2O3 by the atomic implantation method using FeCl3 as Fe source. Fe2O3 modified dolomite was further modified with Co3O4 by precipitation method. The obtained catalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), N2 adsorption–desorption (BET), and temperature-programmed reduction (H2-TPR). From SEM image, it was revealed that nano-Fe2O3 and Co3O4 particles with the size of 80–120 nm. Catalytic performance of activated dolomite, Fe2O3 modified dolomite, and Fe2O3-Co3O4 modified dolomite in catalytic ozonation of NH4+ solution was investigated and evaluated. Among 3 tested catalysts, Fe2O3-Co3O4 modified dolomite has the highest NH4+ conversion (96%) and N2 selectivity (77.82%). Selectivity toward N2 over the catalyst was explained on the basis of bond strength M-O in oxides through the standard enthalpy of oxide. Catalyst with lower value has higher N2 selectivity and the order is the following: Co3O4 ( of 60 kcal (mole O)) > Fe2O3 ( of 70 kcal (mole O)) > MgO ( of 170 kcal (mole O)). Moreover, high reduction ability of Fe2O3-Co3O4 modified dolomite could improve the N2 selectivity by the reduction of NO3- to N2 gas.

中文翻译:

新型纳米Fe2O3-Co3O4改性白云石及其在氨溶液臭氧化中的高效催化剂的应用

催化臭氧化是一种用于去除NH 4 OH溶液的新方法。因此,应实现高催化性能(活性和选择性)。在这项工作中,我们报告了Fe 2 O 3 -Co 3 O 4改性白云石在NH 4 OH溶液的催化臭氧氧化中的合成和催化性能。用Fe 2 O 3和Co 3 O 4成功活化和改性了白云石。首先,通过在800°C加热3 h活化白云石,然后进行KOH处理。活化白云石用Fe 2 O 3改性通过使用FeCl 3作为Fe源的原子注入方法。Fe 2 O 3改性白云石通过沉淀法进一步用Co 3 O 4改性。通过X射线衍射(XRD),傅立叶变换红外光谱(FTIR),能量色散X射线光谱(EDS),扫描电子显微镜(SEM),N 2吸附-脱附(BET)对所得催化剂进行表征。和程序升温还原(H 2 -TPR)。从SEM图像可以看出,纳米Fe 2 O 3和Co 3 O 4粒径为80–120 nm的颗粒。研究和评价了活性白云石,Fe 2 O 3改性白云石和Fe 2 O 3 -Co 3 O 4改性白云石在NH 4 +溶液的催化臭氧氧化中的催化性能。在3种测试过的催化剂中,Fe 2 O 3 -Co 3 O 4改性白云石具有最高的NH 4 +转化率(96%)和N 2选择性(77.82%)。对N 2的选择性通过氧化物的标准焓通过氧化物的结合强度MO来解释催化剂上的过量。催化剂具有较低值具有高N 2选择性和顺序如下:钴3 ø 4(60千卡(摩尔O))>的Fe 2 ö 3(70千卡(摩尔O))>的MgO(170千卡( O))。此外,铁的高还原能力2 ö 3 -Co 3 ö 4改性白云石可改善的N个2由NO的还原选择性3 -到N 2种气体。
更新日期:2020-08-01
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