We used the direct hydrothermal synthesis method to obtain various well-dispersed bimetallic oxides/SBA-15 for the first time.It is possible that well-dispersed relatively large bimetallic sulfates are formed during t...We used the direct hydrothermal synthesis method to obtain various well-dispersed bimetallic oxides/SBA-15 for the first time.It is possible that well-dispersed relatively large bimetallic sulfates are formed during the hydrothermal synthesis process and then re-dispersed with difficulty during the heat treatment process resulting in the formation of well-dispersed oxide particles in SBA-15.TEM elemental maps of CuO-NiO/SBA-15 clearly illustrated that CuO and NiO particles were monodispersed in SBA-15.TEM-EDX line analysis revealed that NiO particles were well distributed on the SBA-15 surface,and then covered by CuO particles.TEM elemental maps of CuO-CeO_(2)/SBA-15 clearly showed that CuO and CeO_(2) particles aggregated slightly in SBA-15.TEM-EDX line analysis showed that CeO_(2) particles were well distributed on the SBA-15 surface,and then covered by CuO particles.TEM elemental maps of NiO-CeO_(2)/SBA-15 clearly illustrated that NiO and CeO_(2) particles aggregated slightly in SBA-15.TEM-EDX line analysis revealed that NiO particles were largely mixed with CeO_(2) on the SBA-15 surface.Therefore,TEM elemental maps can be used to study the dispersion of bimetallic oxides,and TEM-EDX line analysis is very effective for investigating their distribution in SBA-15.Compared with monometallic oxides/SBA-15,the obtained bimetallic oxides/SBA-15 catalysts exhibited excellent efficiency as regards reducing CO_(2) to CO by the reverse water-gas shift(RWGS)reaction.In particular,the bimetallic oxides/SBA-15 catalysts could result in the high CO_(2) conversion to CO at low temperature.展开更多
文摘We used the direct hydrothermal synthesis method to obtain various well-dispersed bimetallic oxides/SBA-15 for the first time.It is possible that well-dispersed relatively large bimetallic sulfates are formed during the hydrothermal synthesis process and then re-dispersed with difficulty during the heat treatment process resulting in the formation of well-dispersed oxide particles in SBA-15.TEM elemental maps of CuO-NiO/SBA-15 clearly illustrated that CuO and NiO particles were monodispersed in SBA-15.TEM-EDX line analysis revealed that NiO particles were well distributed on the SBA-15 surface,and then covered by CuO particles.TEM elemental maps of CuO-CeO_(2)/SBA-15 clearly showed that CuO and CeO_(2) particles aggregated slightly in SBA-15.TEM-EDX line analysis showed that CeO_(2) particles were well distributed on the SBA-15 surface,and then covered by CuO particles.TEM elemental maps of NiO-CeO_(2)/SBA-15 clearly illustrated that NiO and CeO_(2) particles aggregated slightly in SBA-15.TEM-EDX line analysis revealed that NiO particles were largely mixed with CeO_(2) on the SBA-15 surface.Therefore,TEM elemental maps can be used to study the dispersion of bimetallic oxides,and TEM-EDX line analysis is very effective for investigating their distribution in SBA-15.Compared with monometallic oxides/SBA-15,the obtained bimetallic oxides/SBA-15 catalysts exhibited excellent efficiency as regards reducing CO_(2) to CO by the reverse water-gas shift(RWGS)reaction.In particular,the bimetallic oxides/SBA-15 catalysts could result in the high CO_(2) conversion to CO at low temperature.
