Abstract Pyrolysis is potentially an effective treatment of oily sludge for oil recovery, and the addition of a catalyst is expected to affect its pyrolysis behavior. In the present study, Fe/Al-pillared bentonite with various Fe/Al ratios as pyrolysis catalyst is prepared and characterized by XRD, N2 adsorption, and NH3-TPD. The integration of Al and Fe in the bentonite interlayers to form pillared clay is evidenced by increase in the basal spacing. As a result, a critical ratio of Fe/Al exists in the Fe/Al-pillared bentonite catalytic pyrolysis for oil recovery from the sludge. The oil yield increases with respect to increase in Fe/Al ratio of catalysts, then decreases with further increasing of Fe/Al ratio. The optimum oil yield using 2.0 wt% of Fe/Al 0.5-pillared bentonite as catalyst attains to 52.46% compared to 29.23% without catalyst addition in the present study. In addition, the addition of Fe/Al-pillared bentonite catalyst also improves the quality of pyrolysis-produced oil and promotes the formation of CH4. Fe/Al-pillared bentonite provides acid center in the inner surface, which is beneficial to the cracking reaction of oil molecules in pyrolysis process. The present work implies that Fe/Al-pillared bentonite as addictive holds great potential in industrial pyrolysis of oily sludge.

中文翻译：

---

含油污泥的低温热解：铁/铝柱撑膨润土的作用

摘要 热解是一种有效的含油污泥回收处理方法，催化剂的加入有望影响其热解行为。在本研究中，制备了具有不同 Fe/Al 比的 Fe/Al 柱撑膨润土作为热解催化剂，并通过 XRD、N2 吸附和 NH3-TPD 对其进行了表征。铝和铁在膨润土夹层中的结合形成柱状粘土可以通过基础间距的增加来证明。因此，Fe/Al 柱撑膨润土催化热解中存在 Fe/Al 的临界比例，以从污泥中回收油。油收率随着催化剂Fe/Al比的增加而增加，然后随着Fe/Al比的进一步增加而降低。使用 2.0 wt% Fe/Al 0.5 柱撑膨润土作为催化剂的最佳油收率达到 52.46%，而 29. 在本研究中，23% 不添加催化剂。此外，Fe/Al柱撑膨润土催化剂的加入也提高了热解油的质量，促进了CH4的形成。Fe/Al柱撑膨润土在内表面提供酸中心，有利于油分子在热解过程中的裂解反应。目前的工作意味着铁/铝柱撑膨润土作为添加剂在含油污泥的工业热解中具有巨大的潜力。