Catalytic cracking of fuel is an effective method to solve the thermal barrier of hypersonic aerocraft, but requires catalysts that are durable and highly active under high temperature. In this contribution, Pt nanoparticles loaded SiO₂-Al₂O₃ catalyst (PSA-re) was synthesized through modified colloid deposition method (CDM), aiming to improve the stability and dispersion of Pt in the reaction. PSA-re exhibited high cracking activity that heat sink of above 3.9 MJ/kg at 750 °C and stand for 30 min without obvious activity decreasing. Characterizations with Py-FTIR, H₂-TPR, CO chemisorption, XPS, XRD, STEM and CO-DRIFTS techniques on the catalysts revealed that the Pt nanoparticles were dispersed on the PSA-re uniformly and PSA-re have smaller particle size as well as higher Pt dispersion compared with catalyst (PSA-im) that prepared by incipient wetness impregnation method (IWIM). The high activity of PSA-re is strongly associated with abundant accessible Pt metal sites and appropriate acid sites distribution on the surface. Meantime, the outstanding stability is mainly due to anti-sintering ability of Pt particles and alleviated carbon deposition to reduce the loss of Pt metal sites and acid sites.

燃料的催化裂化是解决高超声速飞机热障的有效方法，但需要在高温下具有持久性和高活性的催化剂。在这一贡献中，通过改进的胶体沉积法（CDM）合成了负载Pt纳米粒子的SiO ₂ -Al ₂ O ₃催化剂（PSA- re），目的是提高Pt在反应中的稳定性和分散性。PSA- re表现出很高的开裂活性，在750°C时，散热片高于3.9 MJ / kg，并静置30分钟，而活性没有明显下降。用Py-FTIR，H ₂表征-TPR，CO化学吸附，XPS，XRD，STEM和CO-DRIFTS技术对催化剂的分析表明，与催化剂相比，Pt纳米颗粒均匀地分散在PSA- re上，并且PSA- re具有更小的粒径和更高的Pt分散度（ PSA- IM），其通过制备初湿含浸法（IWIM）。PSA- re的高活性与表面上大量可接近的Pt金属位点和适当的酸位点分布密切相关。同时，出色的稳定性主要归因于Pt颗粒的抗烧结能力和减轻的碳沉积，从而减少了Pt金属位点和酸性位点的损失。