MCM-41负载氧化铜活性组分的结构及其氢程序升温还原特性

STRUCTURAL AND HYDROGEN TEMPERATURE PROGRAMMED REDUCTION PROPERTIES OF MCM-41 SUPPORTED COPPER OXIDE CATALYSTS

用浸渍、表面改性、掺杂、离子交换等方法制备了CuO负载的MCM 41 (CuO MCM 41)催化剂。用X射线衍射、高分辨电镜、氢程序升温还原等技术研究了CuO在MCM 41上的分散情况及氧物种的反应特性。结果表明:负载在MCM 41上的CuO的还原温度要比纯CuO的降低200℃。用离子交换法比浸渍法、掺杂法制备的样品中CuO的分散程度更高,具有更高的氧活性。在有序孔道内分散的高活性的CuO可望在催化领域得到应用。

MCM-41 supported copper oxide catalysts were prepared by four different methods: impregnation, incorporation, modification, and ion-exchange. The reducibility and structure characteristics of the supported copper oxide catalysts were revealed and determined with hydrogen temperature programmed reduction, X-ray diffraction and high-resolution transmission electron microscope. Results show that the reduction temperature of copper oxide, when supported in the pore channels or in the framework of MCM-41, are decreased for more than 200°C as compared to unsupported copper oxide. Ion-exchanged samples show higher reductivity as compared to materials obtained by the impregnation and the incorporation methods. It is expected that highly dispersed copper oxide in the pore channels of well ordered MCM-41 structure has a wide potential application in the advanced catalytic field.