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以CHZ 2催化裂化平衡剂为钝镍对象 ,对优选出的稀土和碱土金属钝镍剂的钝镍效果进行了评价。结果表明 ,稀土和碱土基钝镍剂对平衡催化剂上的沉积镍具有明显的钝化效果。钝镍剂的加入量有一个最佳值 ,适量的钝镍剂除了能钝化镍的脱氢作用 ,还能调节催化剂表面的酸结构。采用X 射线衍射、程序升温还原实验、X光电子能谱等方法对钝镍机理的研究表明 ,在制备过程中 ,沉积镍与稀土金属元素相互作用生成了稳定性高的RENiO3 物相 ,而与碱土金属离子发生晶格取代反应并形成固溶物 ,使镍处于难以还原的高价态 ,封闭了镍的脱氢活性。在相同的还原条件下 ,经钝镍剂处理过的样品中Ni2 P3/ 2 结合能均高于未进行钝镍处理的样品 ,这说明加入钝镍剂后 ,改变了镍的电子特性 ,使镍处于低脱氢活性的高价氧化态
The effect of blunting nickel on rare earth and alkaline earth nickel-based nickel regulators was evaluated with CHZ 2 balance agent as blunt nickel. The results show that the rare earth and alkaline earth nickel-based agents have a significant passivation effect on the deposition of nickel on the equilibrium catalyst. The dosage of the blunt nickel agent has an optimum value. The proper amount of blunt nickel agent can not only deactivate the dehydrogenation of nickel, but also regulate the acid structure of the catalyst surface. The results of X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy and other methods showed that the interaction between nickel and rare earth elements produced a stable RENiO3 phase in the preparation process, The metal ions undergo lattice substitution reaction and form a solid solution, leaving the nickel in a highly valence state that is difficult to reduce, thereby blocking the dehydrogenation activity of nickel. Under the same reduction conditions, the Ni2P3 / 2 binding energy of the passivated nickel treated samples was higher than that of the samples without passivated nickel treatment, which implied that the addition of the passivating nickel changed the electronic properties of nickel, At low dehydrogenation activity in the high oxidation state