The chemical heat sink yielded by the catalytic cracking of supercritical hydrocarbons facilitates the thermal management of hypersonic aircraft. The objective of this study was to alleviate the diffusion restriction of supercritical hydrocarbons in conventional microporous zeolite films. A dual template method involving different n (C_22-6-6)/n (TPAOH) values was adopted to prepare pillared nanosheet HZSM-5 zeolite films by using seed assisted secondary growth. Compared with those of the parent nanosheet HZSM-5 zeolite film (ZN) prepared using only C_22-6-6 as the structure directing agent (SDA), the zeolite film prepared using n (C_22-6-6)/n (TPAOH) of 10/4 (DZN-4) after pillaring exhibited a higher surface area (525 m² g⁻¹) and mesoporous volume (0.453 cm³ g⁻¹). A larger amount of TPAOH in the synthesized solution (n (C_22-6-6)/n (TPAOH) < 10/6) induced the formation of a bulky microporous MFI crystal phase, thereby sacrificing the mesoporous structure. At 550 °C and 4 MPa, the DZN-4 zeolite film yielded the highest n-dodecane conversion rate (76.8%) and TOF value (130.9 s⁻¹), due to the presence of highly accessible Brønsted acid sites and ordered mesoporous structures, leading to a heat sink of 2.99 MJ kg⁻¹, which is 32% higher than that under ZN. Restricted secondary reactions, such as hydride transfer and aromatization, were observed in the presence of highly connected mesopores designed by pillaring, leading to high and low selectivities toward olefins and aromatic compounds, respectively. Amorphous coke was detected on the external mesopore surface of DZN-4, and the adhesive strength was significantly enhanced, resulting in a higher catalytic stability.

超临界碳氢化合物催化裂化产生的化学散热片有助于高超声速飞机的热管理。这项研究的目的是减轻常规微孔沸石膜中超临界烃的扩散限制。采用涉及不同n（C _22-6-6）/ n（TPAOH）值的双模板法，通过种子辅助二次生长制备带柱状的纳米片HZSM-5沸石薄膜。与仅使用C _22-6-6作为结构定向剂（​​SDA）制备的母体纳米片HZSM-5沸石膜（ZN）相比，使用n（C _22-6-6）/ n制备的沸石膜立柱后的（TPAOH）为10/4（DZN-4）表现出较高的表面积（525 m ²  g ^-1）和中孔体积（0.453 cm ³  g ^-1）。合成溶液中大量的TPAOH（n（C _22-6-6）/ n（TPAOH）<10/6）引起大体积微孔MFI晶相的形成，从而牺牲了中孔结构。在550°C和4 MPa下，由于存在高度可及的布朗斯台德酸点和有序的介孔结构，DZN-4沸石膜的正十二烷转化率最高（76.8％）和TOF值（130.9 s ^-1） ，导致2.99 MJ kg ^-1的散热器，比ZN下的价格高32％。在通过立柱设计的高度连接的中孔存在下，观察到了受限的次级反应，例如氢化物转移和芳构化，分别导致了对烯烃和芳族化合物的高选择性和低选择性。在DZN-4的中介孔表面检测到无定形焦炭，其粘合强度显着提高，从而获得了更高的催化稳定性。