Abstract

Membrane catalysts are prepared by the chemical vapor-phase deposition of tungsten oxides on a corundum porous microfiltration membrane. The massive layer of tungsten oxides formed on the substrate is converted to carbides by temperature-programmed carbidization with С₃Н₈/Н₂ and СН₄/Н₂ mixtures. Changes in the porous structure and phase composition of the catalytic layer at stages of vapor-phase deposition and carbidization of oxides deposited on the corundum substrate are considered. Dependence of the depth of distribution of tungsten compounds on the deposition temperature is studied by electron scanning microscopy and X-ray spectroscopy. A relationship is established between the synthesis conditions of tungsten carbide-based membrane catalysts and their phase composition, porous structure characteristics, and morphology.

中文翻译：

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基于碳化钨的膜催化剂的相组成，多孔结构和形态的形成

摘要

膜催化剂是通过在刚玉多孔微滤膜上化学气相沉积氧化钨而制备的。在基板上形成钨氧化物的块状层通过程序升温carbidization转化为碳化物С ₃ Н ₈ /Н ₂和СН ₄ /Н ₂混合物。考虑在气相沉积和沉积在刚玉基底上的氧化物的碳化之间的阶段，催化层的多孔结构和相组成的变化。通过电子扫描显微镜和X射线光谱研究了钨化合物的分布深度对沉积温度的依赖性。在碳化钨基膜催化剂的合成条件与它们的相组成，多孔结构特征和形态之间建立关系。