Tumbalev Vencislav, Kovacheva Daniela, Spassova Ivanka, Velinova Ralitsa, Tyuliev Georgi, Velinov Nikolay, Naydenov Anton
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Nanomaterials (Basel). 2022 Nov 4;12(21):3900. doi: 10.3390/nano12213900.
The present paper reports on MnCoFeO spinels with peculiar composition and their catalytic behavior in the reactions of complete oxidation of hydrocarbons. The samples were synthesized by solution combustion method with sucrose and citric acid as fuels. All samples were characterized by powder X-ray diffraction, N-physisorption, scanning electron microscopy, thermal analysis, X-ray photoelectron spectroscopy, and Mössbauer spectroscopy. The catalytic properties of the spinels with Mn:Co:Fe = 1:1:1 composition were studied in reactions of complete oxidation of methane, propane, butane, and propane in the presence of water as model pollutants. Both prepared catalysts are nanosized materials. The slight difference in the compositions, structure, and morphology is due to the type of fuel used in the synthesis reaction. The spinel, prepared with sucrose, shows a higher specific surface area, pore volume, higher amount of small particles fraction, higher thermal stability, and as a result, more exposed active sites on the sample surface that lead to higher catalytic activity in the studied oxidation reactions. After the catalytic tests, both samples do not undergo any substantial phase and morphological changes; thus, they could be applied in low-temperature hydrocarbon oxidation reactions.
本文报道了具有特殊组成的锰钴铁氧体尖晶石及其在烃类完全氧化反应中的催化行为。样品采用蔗糖和柠檬酸作为燃料通过溶液燃烧法合成。所有样品均通过粉末X射线衍射、N-物理吸附、扫描电子显微镜、热分析、X射线光电子能谱和穆斯堡尔谱进行表征。研究了锰：钴：铁 = 1:1:1组成的尖晶石在甲烷、丙烷、丁烷完全氧化反应以及丙烷在水作为模型污染物存在下的氧化反应中的催化性能。两种制备的催化剂均为纳米材料。组成、结构和形态上的细微差异是由于合成反应中使用的燃料类型所致。用蔗糖制备的尖晶石具有更高的比表面积、孔体积、更高比例的小颗粒、更高的热稳定性，因此，样品表面有更多暴露的活性位点，这导致在所研究的氧化反应中具有更高的催化活性。催化测试后，两个样品均未发生任何实质性的相和形态变化；因此，它们可应用于低温烃类氧化反应。
