CeO₂-based materials are widely applied in a three-way catalyst framework for catalytic combustion of diesel soot. For the application of CeO₂ in coking inhibition during thermal cracking of hydrocarbons, SiO₂–CeO₂ and SiO₂ coatings were prepared on HP40 alloy samples through sol–gel dip coating. The coatings were then characterized in terms of morphology and microstructure perspectives, and their anticoking performances were evaluated under conditions relevant to the practical applications during thermal cracking of naphtha. Results showed that the addition of ceria could improve the quality of the silica coating, which subsequently presented better anticoking properties by preventing formation of catalytic coking. Furthermore, thermogravimetric analysis (TGA) results of coke samples revealed that the ceria in the coating had the potential function as a coke oxidation catalyst. However, the silica–ceria coating lost its coking resistance after approximately ten repetitious coking/decoking cycles. Nevertheless, the combined application of anticoking coatings and addition of dimethyl disulfide (DMDS) into the naphtha feed could mitigate risks of coke formation more effectively compared with pure coatings only because of its preferential adsorption of sulfur-based radicals at the coating defects. In particular, the application of the SiO₂–CeO₂ coating combined with the addition of DMDS could still maintain a stable anticoking rate of above 60% throughout three cycles of coking/decoking operations.

中文翻译：

---

轻石脑油热裂解过程中溶胶-凝胶衍生的SiO ₂和SiO ₂ -CeO ₂涂层的抗焦性能研究

基于CeO ₂的材料广泛应用于柴油烟灰催化燃烧的三效催化剂框架中。为了将CeO ₂用于烃类热裂解过程中的焦化抑制，可使用SiO ₂ -CeO ₂和SiO ₂通过溶胶-凝胶浸涂在HP40合金样品上制备涂层。然后根据形态和微观结构的角度对涂层进行表征，并在与石脑油热裂化过程中的实际应用相关的条件下评估其抗结焦性能。结果表明，添加二氧化铈可以改善二氧化硅涂层的质量，随后通过防止催化焦化的形成而表现出更好的抗焦性能。此外，焦炭样品的热重分析（TGA）结果表明，涂​​层中的二氧化铈具有潜在的功能，可作为焦炭氧化催化剂。然而，二氧化硅-二氧化铈涂层在大约十次重复的焦化/焦化循环后失去了其耐焦化性。不过，与纯涂料相比，结合使用防焦涂料和在石脑油进料中添加二甲基二硫（DMDS）可以更有效地降低焦炭形成的风险，这仅是因为其优先吸收了硫基自由基在涂料缺陷处的吸附。特别是SiO的应用在焦化/除焦操作的三个循环中，结合使用₂ -CeO ₂涂层和DMDS仍可以保持60％以上的稳定防焦率。