In this study, NiK/yCe_xZr_1-xO₂-macroporous Al₂O₃ catalysts (y=0, 10, 20, and 30; x=0.73–0.92) were synthesized by dispersing different amounts of Ce_xZr_1-xO₂ phase onto macroporous γ-Al₂O₃ as supports, and then subsequently impregnating Ni and K into the supports, which possessed advantageous properties, such as a high surface area, ordered macropores and high oxygen storage capacity. Moreover, the introduction of Ni and K metals into these supports created more oxygen vacancies in them. We applied these catalysts to the cracking of vacuum residue with steam. It was found that the variation of the liquid yield with the amount of Ce_xZr_1-xO₂ phase showed a volcano pattern. The macropores in the supports played an important role in enhancing the diffusion of large molecules to the active sites, while the high oxygen storage capacity over the Ce_xZr_1-xO₂ phase improved the oxidative cracking rate, thereby increasing the lighter oil fraction from the vacuum residue.

中文翻译：

---

NiK / yCexZr1-xO2-大量的Al2O3催化剂，用于蒸汽裂解真空渣油

在这项研究中，通过分散不同量的Ce _x Zr ₁合成了NiK / yCe _x Zr _1-x O _2-大量Al ₂ O ₃催化剂（y = 0、10、20和30； x = 0.73-0.92）。_-x ø ₂相到大孔的γ-Al ₂ ö ₃作为载体，然后将Ni和K浸渍到载体中，该载体具有有利的性质，例如高表面积，有序大孔和高储氧能力。此外，将镍和钾金属引入这些载体中会在其中产生更多的氧空位。我们将这些催化剂应用于蒸汽裂解真空残留物。发现随着Ce _x Zr _1-x O ₂相的量液体产率的变化显示出火山模式。载体中的大孔在增强大分子向活性位点的扩散方面起着重要作用，而Ce _x Zr _1-x O _2上的高储氧能力 相提高了氧化裂化速率，从而增加了真空残渣中较轻的油馏分。