In order to investigate the effect of different pillarmaterials on low-temperature de-NO activity of pillaredclay(PILCs),the study is carried out by pillaring clay withtitanium oxides,zirconium oxides,iron oxidesrespe...In order to investigate the effect of different pillarmaterials on low-temperature de-NO activity of pillaredclay(PILCs),the study is carried out by pillaring clay withtitanium oxides,zirconium oxides,iron oxidesrespectively to obtain three different kinds of PILCs,which are then loaded them with the same amount ofmanganese and cerium oxides by the method ofimpregnation.BET,XRD,H2-TPR and NHg-TPD areused to characterize the properties of the catalysts.展开更多
A series of CeO2/Al2O3 catalysts was modified with praseodymium oxide using an extrusion method. The cata- lytic activities of the obtained catalysts were measured for the selective catalytic reduction of NO with NH3 ...A series of CeO2/Al2O3 catalysts was modified with praseodymium oxide using an extrusion method. The cata- lytic activities of the obtained catalysts were measured for the selective catalytic reduction of NO with NH3 to screen suitable addition of praseodymium oxide. These samples were characterized by XRD, N2-BET, NH3-TPD, NO-TPD, Py-IR, H2-TPR, Raman spectra and XPS, respectively. Results showed the optimal catalyst with the Pr/Ce molar ratio of 0.10 exhibited more than 90% NO conversion in a wide temperature range of 290-425℃ under GHSV of 5000 h i. The number of Lewis acid sites and the chemisorbed oxygen concentration of the catalysts would increase with the Pr incorporation, which was favorable for the excellent catalytic performance. In addition, the Pr incorporation inhibited growth of the Al2O3 crystal particles and led to the lattice expansion of CeO2, which increased catalytic activity. The results implied that the higher chemisorbed oxygen concentrations and the more Lewis acid sites were conductive to obtain the excellent SCR activity.展开更多
文摘In order to investigate the effect of different pillarmaterials on low-temperature de-NO activity of pillaredclay(PILCs),the study is carried out by pillaring clay withtitanium oxides,zirconium oxides,iron oxidesrespectively to obtain three different kinds of PILCs,which are then loaded them with the same amount ofmanganese and cerium oxides by the method ofimpregnation.BET,XRD,H2-TPR and NHg-TPD areused to characterize the properties of the catalysts.
文摘A series of CeO2/Al2O3 catalysts was modified with praseodymium oxide using an extrusion method. The cata- lytic activities of the obtained catalysts were measured for the selective catalytic reduction of NO with NH3 to screen suitable addition of praseodymium oxide. These samples were characterized by XRD, N2-BET, NH3-TPD, NO-TPD, Py-IR, H2-TPR, Raman spectra and XPS, respectively. Results showed the optimal catalyst with the Pr/Ce molar ratio of 0.10 exhibited more than 90% NO conversion in a wide temperature range of 290-425℃ under GHSV of 5000 h i. The number of Lewis acid sites and the chemisorbed oxygen concentration of the catalysts would increase with the Pr incorporation, which was favorable for the excellent catalytic performance. In addition, the Pr incorporation inhibited growth of the Al2O3 crystal particles and led to the lattice expansion of CeO2, which increased catalytic activity. The results implied that the higher chemisorbed oxygen concentrations and the more Lewis acid sites were conductive to obtain the excellent SCR activity.
