A Pt@SSZ-13@β core-shell catalyst is designed and successfully prepared for investigating the effects of spillover hydrogenation on hydrocracking of naphthalene. The Pt NPs encapsulated in SSZ-13 cages are inaccessible to naphthalene due to its lager size than the pore size of SSZ-13. Thus, hydrogenation functional over Pt@SSZ-13@β is mainly realized via spillover hydrogenation. Pt@SSZ-13@β exhibits higher selectivity to the desired BTX and less naphthenic products than (Pt/SSZ-13)@β and Pt/(SSZ-13@β) at above 90 % naphthalene conversion. These results indicate the hydrogenation modes resulting from the location of the supported Pt NPs in core-structure catalysts can affect the metal-acid balance, and the spillover hydrogenation can effectively suppress the deep hydrogenation of tetralin in hydrocracking of naphthalene, thereby changing the reaction path and improving the selectivity of BTX. In addition, Pt@SSZ-13@β shows a better sulfur-tolerant ability than Pt/(SSZ-13@β). This work provides a new synthetic strategy for preparing zeolite-based bifunctional catalyst.

设计并成功制备了一种Pt@SSZ-13@β核-壳催化剂，用于研究溢出加氢对萘加氢裂化的影响。由于萘的尺寸大于 SSZ-13 的孔径，因此封装在 SSZ-13 笼中的 Pt NP 无法接触到萘。因此，Pt@SSZ-13@β上的氢化功能主要通过溢出氢化实现。与 (Pt/SSZ-13)@β 和 Pt/(SSZ-13@β) 相比，Pt@SSZ-13@β 在萘转化率高于 90% 时表现出对所需 BTX 的更高选择性和更少的环烷产物。这些结果表明，核结构催化剂中负载型 Pt NPs 的位置导致的加氢模式会影响金属酸平衡，溢出加氢可以有效抑制萘加氢裂化中四氢化萘的深度加氢，从而改变反应路径，提高BTX的选择性。此外，Pt@SSZ-13@β表现出比Pt/(SSZ-13@β)更好的耐硫能力。该工作为制备沸石基双功能催化剂提供了一种新的合成策略。