CeO2对Ni/γ-Al2O3、Pt/γ-Al2O3中Ni、Pt分散度的影响

The effect of additive CeO2 on the dispersion of Ni and Pt in Ni/γ-Al2O3 and Pt/γ-Al2O3

用X射线衍射、脉冲氢氧滴定等方法,研究了添加CeO_2对Ni/γ-Al_2O_3、Pt/γ-Al_2O_3催化剂中Ni、Pt分散度的影响。结果表明,在一定条件下,CeO_2可以在γ-Al_2O_3表面呈单层分散,且有一个最大单层分散量(0.024gCeO_2/100m^2γ-Al_2O_3)。CeO_2的加入可以提高Ni、P^+在γ-Al_2O_3上的分散度,在CeO_2含量未达到最大分散量之前,Ni、Pt的分散度随CeO_2含量的增加而增加,而当CeO_2含量接近或达到最大分散量时,Ni、Pt的分散度则增至最大。

The effect of additive CeO_2 on the dispersion of Ni and Pt in Ni/γ- Al_2O_3 and Pt/γ- Al_2O_3 systems was investigated by means of XRD and HOT. The results show that CeO_2 can be dispersed as a monolayer onto the surface of γ- Al_2O_3. The monolayer dispersion capacity of CeO_2 on γ- Al_2O_3 is 0. 024gCeO_2/100m^2γ- Al_2O_3. The dispersion of Ni and Pt supported on γ- Al_2O_3 increases with the content of additive CeO_2 until the later reaches its monolayer dispersion capacity.