Catalytic performance of Mo/HZSM\|5 and Zn modified Mo/HZSM\|5 catalysts under various pretreatment conditions have been studied. The results indicate that the active species exist in oxidative state, and the catalyst...Catalytic performance of Mo/HZSM\|5 and Zn modified Mo/HZSM\|5 catalysts under various pretreatment conditions have been studied. The results indicate that the active species exist in oxidative state, and the catalyst pretreated by raising temperature in N\-2 atmosphere exhibits distinguished catalytic activity and benzene selectivity, also higher stability.展开更多
Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-tem...Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-temperature oxidation in humid circumstance are investigated. The sample calcines at 443 K in flowing air exhibited good activity and stability for CO oxidation. 80% CO conversion rate can be achieved after 3 000 min with a feed gas contained 3.1%(φw) of water vapor. The physical and chemical properties of the Au/Co3O4/CeO2 samples are characterized by X-ray diffraction (XRD),temperature-programmed reduction (H2-TPR),and transmission electron microscopy (TEM) techniques. The characterized results show that the prepared material calcined at 443 K has a weak diffraction peak of gold species observed by XRD,the grain diameter of 3 nm by TEM and best redox property and the highest activity for CO oxidation by H2-TPR at prope calcined temperature.展开更多
文摘Catalytic performance of Mo/HZSM\|5 and Zn modified Mo/HZSM\|5 catalysts under various pretreatment conditions have been studied. The results indicate that the active species exist in oxidative state, and the catalyst pretreated by raising temperature in N\-2 atmosphere exhibits distinguished catalytic activity and benzene selectivity, also higher stability.
文摘Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-temperature oxidation in humid circumstance are investigated. The sample calcines at 443 K in flowing air exhibited good activity and stability for CO oxidation. 80% CO conversion rate can be achieved after 3 000 min with a feed gas contained 3.1%(φw) of water vapor. The physical and chemical properties of the Au/Co3O4/CeO2 samples are characterized by X-ray diffraction (XRD),temperature-programmed reduction (H2-TPR),and transmission electron microscopy (TEM) techniques. The characterized results show that the prepared material calcined at 443 K has a weak diffraction peak of gold species observed by XRD,the grain diameter of 3 nm by TEM and best redox property and the highest activity for CO oxidation by H2-TPR at prope calcined temperature.
