Preparation of Pd-based metal monolithic catalysts and a study of their performance in the catalytic combustion of methane

摘要

A series of Pd/SBA-15/Al2O3/FeCrAl and Pd/5 wt% Ce1-xZrxO2/SBA-15/Al2O3/FeCrAl metal monolithic catalysts were prepared and characterized by various techniques. The catalytic activity and the stability of the catalysts for methane combustion were evaluated. All the catalysts retain the SBA-15 mesoporous structure, with PdO being confined in its channels. The results show that the addition of Ce1-xZrxO2 as promoters can improve the activity and stability of the catalysts. The stabilities of the metal monolithic catalysts ore much better than those of Pd/SBA-75 particle catalysts. The catalyst with ZrO2 as promoter exhibits the best activity and stability (T-90=395 degrees C), and the conversion of methane remains constant during the 700 h test.