The Cu/Cr base catalysts were prepared by impregnation. XRD and TPR technology were applied to characterize the catalysts. The result showed that the Cu/Cr base catalysts performed much better than the conventional Cu...The Cu/Cr base catalysts were prepared by impregnation. XRD and TPR technology were applied to characterize the catalysts. The result showed that the Cu/Cr base catalysts performed much better than the conventional Cu/Zn/Al catalysts. The stability of the catalysts was enhanced by promoters such as K, Mg, Ni, Y. But the promoters reduced the initial activity of the catalysts. The promoters except Y improved the selectivity apparently.展开更多
The activities of Ni catalysts with different supports in methane decomposition have been studied. The activity order of the catalysts is Ni/SiO 2>Ni/MgO-Al 2O 3>Ni/CaO-Al 2O 3>Ni/α-Al 2O 3 and the interacti...The activities of Ni catalysts with different supports in methane decomposition have been studied. The activity order of the catalysts is Ni/SiO 2>Ni/MgO-Al 2O 3>Ni/CaO-Al 2O 3>Ni/α-Al 2O 3 and the interaction between Ni and the support is in the order of Ni/SiO 2<Ni/MgO-Al 2O 3<Ni/CaO-Al 2O 3<Ni/α-Al 2O 3. It is thus concluded that the weaker the interaction between Ni and support, the higher the activity of the catalyst. It was also found that the activity of the silica supported Ni-catalyst was increased with increase in its average pore radius and predominance pore radius.展开更多
文摘The Cu/Cr base catalysts were prepared by impregnation. XRD and TPR technology were applied to characterize the catalysts. The result showed that the Cu/Cr base catalysts performed much better than the conventional Cu/Zn/Al catalysts. The stability of the catalysts was enhanced by promoters such as K, Mg, Ni, Y. But the promoters reduced the initial activity of the catalysts. The promoters except Y improved the selectivity apparently.
文摘The activities of Ni catalysts with different supports in methane decomposition have been studied. The activity order of the catalysts is Ni/SiO 2>Ni/MgO-Al 2O 3>Ni/CaO-Al 2O 3>Ni/α-Al 2O 3 and the interaction between Ni and the support is in the order of Ni/SiO 2<Ni/MgO-Al 2O 3<Ni/CaO-Al 2O 3<Ni/α-Al 2O 3. It is thus concluded that the weaker the interaction between Ni and support, the higher the activity of the catalyst. It was also found that the activity of the silica supported Ni-catalyst was increased with increase in its average pore radius and predominance pore radius.
