Catalysis Letters ( IF 2.3 ) Pub Date : 2022-01-28 , DOI: 10.1007/s10562-021-03907-y
Yu Liang , Binbin Zhao , Qiong Tang , Lei Liu , Jinxiang Dong
|
Regularly dispersed Pt particles on SBA-15 supported catalysts were synthesized with a Pt loading of 5 wt% by a sol-immobilisation method, wherein various Pt particle sizes within 1–5 nm were finely controlled via the adjustment of the addition amount of polyvinyl alcohol (PVA). A high PVA/Pt ratio of the initial solution tended to generate small Pt particles on the SBA-15 support due to intense protection against Pt particle aggregation. In addition, the effect of Pt particle size on naphthalene hydrogenation was investigated in terms of catalytic performance. Compared with the performance of other catalysts with Pt particle sizes greater or less than 3.5 nm, Pt nanoparticles with sizes centered at 3.5 nm exhibited excellent catalytic performance towards decalin. This excellent catalytic performance was mainly attributed to a suitable ratio of the edge sites to flat sites on these Pt nanoparticles, benefitting the rapid adsorption of naphthalene and dissociation of hydrogen.
Graphical Abstract
The Pt/SBA-15 catalysts were prepared by sol-immobilisation method. The highest performance was attributed to the Pt-nanoparticles with suitable flat/edge sites ratio.
中文翻译:

通过溶胶固定法调整 SBA-15 上的 Pt 纳米颗粒尺寸以实现萘加氢
合成了在 SBA-15 负载型催化剂上规则分散的 Pt 颗粒,Pt 负载量为 5 wt% 通过溶胶固定法,其中通过调整聚乙烯醇(PVA)的添加量来精细控制 1-5 nm 内的各种 Pt 粒径。由于对 Pt 颗粒聚集的强烈保护,初始溶液的高 PVA/Pt 比率倾向于在 SBA-15 载体上产生小的 Pt 颗粒。此外,还从催化性能的角度研究了 Pt 粒径对萘加氢的影响。与 Pt 粒径大于或小于 3.5 nm 的其他催化剂的性能相比,以 3.5 nm 为中心的 Pt 纳米颗粒对萘烷表现出优异的催化性能。这种优异的催化性能主要归因于这些 Pt 纳米粒子上边缘位点与平面位点的合适比例,
图形概要
Pt/SBA-15催化剂采用溶胶固定法制备。最高性能归因于具有合适的平面/边缘位置比率的 Pt 纳米粒子。