Abstract

Nanodispersed SnO₂–CeO₂ catalysts for the oxidation of CO and СН₄ were synthesized by coprecipitation in a water–isopropanol solution followed by thermal treatment. It was shown that Sn_хCe_1–хO₂ solid solutions based on the crystal lattice of cerium dioxide were formed at x ≤ 0.15. The samples were characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), nitrogen adsorption–desorption, and gas chromatography. The materials had a mesoporous structure: the specific surface area was 52.3–69.7 m²/g, and the total pore volume was 0.073–0.108 cm³/g. When the SnO₂ content was greater than 30 mol %, plate-shaped SnO₂ particles with sizes greater than 100 nm were formed along with nearly spherical solid solution particles of size 8–10 nm. The synthesized solid solutions were highly active in the oxidation reactions of CO and methane, and they can be used as catalysts and supports.

中文翻译：

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一氧化碳与甲烷氧化反应中纳米分散SnO 2 -CeO 2催化剂的合成及活性

摘要

纳米分散的SnO _2种-CeO ₂催化剂的CO和СН的氧化₄通过共沉淀在水-异丙醇溶液，然后通过热处理合成。结果表明，Sn的_х铈_{1- х} Ò ₂在形成基于二氧化铈的晶格固溶X ≤0.15。样品通过能量色散谱（EDS），X射线衍射（XRD）分析，透射电子显微镜（TEM），氮气吸附-解吸和气相色谱进行了表征。材料具有中孔结构：比表面积为52.3-69.7 m ² / g，总孔体积为0.073-0.108 cm³ /克。当SnO ₂含量大于30 mol％时，会形成尺寸大于100 nm的板状SnO ₂颗粒以及尺寸为8-10 nm的近球形固溶体颗粒。合成的固溶体在CO和甲烷的氧化反应中具有很高的活性，可以用作催化剂和载体。