制备方法对MgAl水滑石衍生氧化物负载钯催化剂丙烷完全氧化活性的影响

以沉积沉淀法(DP)、浸渍法(IM)和共沉淀法(CP)制备MgAl水滑石衍生氧化物负载钯催化剂,用ICP、XRD、SEM、TEM、EDS、TPR以及比表面测定等手段对催化剂进行了表征.ICP和XRD数据表明用上述3种方法均可成功制备水滑石为前体载钯催化剂.SEM、TEM、EDS数据表明不同方法制备的样品具有不同的形貌以及钯在其中的分散度.综合各类表征数据可知Pd在催化剂中暴露的活性位是影响其活性的主要因素.

Effects of preparation methods on Pd catalysts derived from MgAl hydrotalcite precursors for total oxidation of propane

Pd catalysts derived from MgAl hydrotalcite precursors were prepared by three different methods: deposition-precipitation (DP), impregnation (IM), and co-precipitation (CP), which were characterized by ICP, XRD, SEM, TEM, EDS, TPR and surface area measurement. The ICP and XRD data shows that the Pd catalysts derived from hydrotalcite precursors could be successfully prepared with all of the three catalysts. The SEM, TEM and EDS profiles suggested that the samples made with different methods had various topology and palladium dispersions. It could be known from the above characterizations that the active sites exposed on the catalysts were a main aspect in influencing the catalytic activities.