Stabilized oxyborates and their use for oxidative conversion of hydrocarbons
申请人:Bio2Electric, LLC
公开号:US10919027B1
公开(公告)日:2021-02-16
An oxygen transfer agent comprising a metal-boron oxide is provided. The average oxidation state of the metal in the metal-boron oxide is about 3+, and has 10% or less of a stoichiometric excess in moles of Mn with respect to the boron. The oxygen transfer agent may further comprise a magnesia-phosphate cement. The oxygen transfer agent is capable of oxidatively dehydrogenating a hydrocarbon feed at reaction conditions to produce a dehydrogenated hydrocarbon product and water. The oxidative dehydrogenation can take place under reaction conditions of less than 1000 ppm weight molecular oxygen, or in the presence of more than 1000 ppm weight of molecular oxygen. Also provided are methods of using the oxygen transfer agents, and an apparatus for effecting the oxidative dehydrogenation of the hydrocarbon feed.
Low temperature synthesis and characterization of pure lanthanum hexaboride nanocrystals
作者:Tuncay Simsek、Arun K. Chattopadhyay、Mustafa Baris、Murat Bilen
DOI:10.1016/j.jssc.2019.04.039
日期:2019.8
of LaB6 nanocrystals at lowtemperatures. The synthetic route employed involved lowtemperature magnesiothermic reduction process of La2O3 with a mixture of Mg, I2 and B2O3 at 90 °C. The powder mixtures were mechanically induced under Ar atmosphere for 3 h and then heat treated. The pure form of nano LaB6 powder produced by this technique is by far the most versatile route for the synthesis of nano-LaB6
这项研究旨在在低温下合成非常纯净的LaB 6纳米晶体。所采用的合成路线涉及在90°C下将La 2 O 3与Mg,I 2和B 2 O 3的混合物进行低温镁热还原过程。将粉末混合物在Ar气氛下机械诱导3 h,然后进行热处理。迄今为止,通过这种技术生产的纯形式的纳米LaB 6粉末是合成纳米LaB 6的最通用途径。从合成粉末的XRD证据中,已经阐明了还原过程的正确反应路径。通过SEM和XRD估计合成的纳米粉末的平均粒径分别为78±12nm和61.3±2.0nm,并且发现值具有良好的一致性。通过XRD确定的粒径是应用Rietveld精制方法并使用各向同性的Lorentzian Scherrer各向同性的精制峰分布的颗粒展宽参数(LX)。根据颗粒的平均尺寸和通过BET法确定的LaB 6的比表面积(1.3 m 2 / g),估计可能构成尺寸为61.3±2.0 nm的纳米颗粒的单位晶体数目如10 5LaB
Svatovskaya, L. B.; Sychev, M. M.; Ryabinina, G. A., Journal of applied chemistry of the USSR, 1981, vol. 54, p. 576 - 580
作者:Svatovskaya, L. B.、Sychev, M. M.、Ryabinina, G. A.、Korneeva, T. A.
DOI:——
日期:——
Berger, S. V., Acta Chemica Scandinavica (1947), 1949, vol. 3, p. 660 - 675