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Synergistic interface between Co 3 O 4 and MgAl 2 O 4 in CO 2 assisted continuous vapour phase oxidative dehydrogenation of ethylbenzene to styrene monomer
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.arabjc.2018.07.018
Venkata Rao Madduluri , Peddinti Nagaiah , Challa Prathap , K. Vasikerappa , Ajmeera Nagu , Burri David Raju , Kamaraju Seetha Rama Rao

Abstract A Series of Co3O4/MgAl2O4 spinel catalysts were prepared by conventional co-precipitation method with various Co loadings (0.5, 0.75, 1.0 and 1.25) keeping Mg/Al atomic ratio of 1.0 with over all Co + Mg + Al concentration at 3.0. Catalysts characteristics were throughly obtained by X ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), UV–Vis Diffuse reflectance spectra, Temperature programmed reduction (H2-TPR), Transmission electron microscopy (TEM), Thermogravimetric analysis (TGA), NH3 and CO2 Temperture programmed desorption (TPD), CO2 pulse chemisorption, CHNS elemental analysis, and Surface area techniques. The superior catalytic activity accomplished by the catalyst with Co concentration of 1.0 (Co3O4/MgAl2O4), for an oxidative dehydrogenation of ethylbenzene can be ascribed to the presence of more number of active Co species. Co-precipitation method seems to be a excellent method in maintaining better synergistic influence, more number of active solid solution species such as MgCo2O4 or MgxCo(1−x)Al2O4 which were advantageous role for better catalytic efficiency. Suitable number of optimized acidic-basic properties measured by NH3 and CO2-TPD analysis was another property influencing the activity with respect to desired product contribution. Higher, 81.2% ethylbenzene conversion (81.2%) with 98% styrene selectivity was attained on 1.0Co3O4/MgAl2O4 in comparision to Co3O4/MgO, and Co3O4/γ-Al2O3 catalysts. According to the CO2 pulse chemisorption reaction with dehydrogenation of ethylbenzene over 1.0Co3O4/MgAl2O4 resulted to get superior CO yield which was promised to get higher ethylbenzene conversion as well as styrene selectivity.

中文翻译:

CO 2 中Co 3 O 4 和MgAl 2 O 4 之间的协同界面辅助乙苯连续气相氧化脱氢制苯乙烯单体

摘要 采用常规共沉淀法制备了一系列 Co3O4/MgAl2O4 尖晶石催化剂,不同 Co 负载量(0.5、0.75、1.0 和 1.25)保持 Mg/Al 原子比为 1.0,总 Co+Mg+Al 浓度为 3.0。催化剂特性通过 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FT-IR)、紫外-可见漫反射光谱、程序升温还原 (H2-TPR)、透射电子显微镜 (TEM)、热重分析获得(TGA)、NH3 和 CO2 程序升温脱附 (TPD)、CO2 脉冲化学吸附、CHNS 元素分析和表面积技术。Co浓度为1.0的催化剂(Co3O4/MgAl2O4)实现了优异的催化活性,乙苯的氧化脱氢反应可以归因于存在更多数量的活性 Co 物种。共沉淀法似乎是一种极好的方法,可以保持更好的协同作用,更多的活性固溶体物种,如 MgCo2O4 或 MgxCo(1-x)Al2O4,它们对更好的催化效率有有利作用。通过 NH3 和 CO2-TPD 分析测量的优化酸碱性质的合适数量是影响与所需产物贡献相关的活性的另一个性质。与 Co3O4/MgO 和 Co3O4/γ-Al2O3 催化剂相比,在 1.0Co3O4/MgAl2O4 上获得了更高的 81.2% 乙苯转化率 (81.2%) 和 98% 苯乙烯选择性。根据CO2脉冲化学吸附反应,乙苯脱氢超过1。
更新日期:2020-01-01
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