Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG Utrecht, Netherlands.
State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Science. 2022 Jul 8;377(6602):204-208. doi: 10.1126/science.abn8289. Epub 2022 Jul 7.
Maximizing the utilization of noble metals is crucial for applications such as catalysis. We found that the minimum loading of platinum for optimal performance in the hydroconversion of -alkanes for industrially relevant bifunctional catalysts could be reduced by a factor of 10 or more through the rational arranging of functional sites at the nanoscale. Intentionally depositing traces of platinum nanoparticles on the alumina binder or the outer surface of zeolite crystals, instead of inside the zeolite crystals, enhanced isomer selectivity without compromising activity. Separation between platinum and zeolite acid sites preserved the metal and acid functions by limiting micropore blockage by metal clusters and enhancing access to metal sites. Reduced platinum nanoparticles were more active than platinum single atoms strongly bonded to the alumina binder.
最大限度地利用贵金属对于催化等应用至关重要。我们发现，通过在纳米尺度上合理布置功能位点，可使工业相关双功能催化剂中 -链烷烃加氢转化反应中最优性能所需的铂最小负载量降低 10 倍甚至更多。通过将铂纳米颗粒有意沉积在氧化铝载体或沸石晶体的外表面上，而不是沸石晶体内部，可以在不降低活性的情况下提高异构体选择性。铂与沸石酸位的分离通过限制金属簇堵塞微孔和增强对金属位的可及性来保持金属和酸功能。与强烈结合在氧化铝载体上的铂单原子相比，减少的铂纳米颗粒具有更高的活性。
