Gavrilova Natalia, Myachina Maria, Nazarov Victor, Skudin Valery
Department of Colloid Chemistry, Faculty of Natural Sciences, D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047 Moscow, Russia.
Department of Chemical Technology of Carbon Materials, Faculty of Petroleum Chemistry and Polymers, D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047 Moscow, Russia.
Nanomaterials (Basel). 2021 Mar 30;11(4):873. doi: 10.3390/nano11040873.
In recent years, much attention has been paid to the development of a new flexible and variable method for molybdenum carbide (MoC) synthesis. This work reports the applicability of nano-size clusters of molybdenum blue to molybdenum carbide production by thermal treatment of molybdenum blue xerogels in an inert atmosphere. The method developed made it possible to vary the type (glucose, hydroquinone) and content of the organic reducing agent (molar ratio R/Mo). The effect of these parameters on the phase composition and specific surface area of molybdenum carbides and their catalytic activity was investigated. TEM, UV-VIS spectroscopy, DTA, SEM, XRD, and nitrogen adsorption were performed to characterize nanoparticles and molybdenum carbide. The results showed that, depending on the synthesis conditions, variants of molybdenum carbide can be formed: α-MoC, η-MoC, or γ-MoC. The synthesized samples had a high specific surface area (7.1-203.0 m/g) and meso- and microporosity. The samples also showed high catalytic activity during the dry reforming of methane. The proposed synthesis method is simple and variable and can be successfully used to obtain both MoC-based powder and supports catalysts.
近年来，人们十分关注一种用于合成碳化钼（MoC）的新型灵活可变方法的开发。这项工作报道了通过在惰性气氛中对钼蓝干凝胶进行热处理，钼蓝纳米尺寸簇在碳化钼生产中的适用性。所开发的方法能够改变有机还原剂的类型（葡萄糖、对苯二酚）和含量（摩尔比R/Mo）。研究了这些参数对碳化钼的相组成、比表面积及其催化活性的影响。采用透射电子显微镜（TEM）、紫外可见光谱（UV-VIS）、差示热分析（DTA）、扫描电子显微镜（SEM）、X射线衍射（XRD）和氮气吸附等方法对纳米颗粒和碳化钼进行了表征。结果表明，根据合成条件，可以形成不同变体的碳化钼：α-MoC、η-MoC或γ-MoC。合成的样品具有较高的比表面积（7.1-203.0 m/g）以及介孔和微孔结构。这些样品在甲烷干重整过程中也表现出较高的催化活性。所提出的合成方法简单且可变，可成功用于制备基于MoC的粉末和负载型催化剂。
