Looking for the active hydrogen species in a 5 wt% Pt/C catalyst: a challenge for inelastic neutron scattering,Faraday Discussions

当前位置： X-MOL 学术 › Faraday Discuss. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Looking for the active hydrogen species in a 5 wt% Pt/C catalyst: a challenge for inelastic neutron scattering
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-01-05 , DOI: 10.1039/c7fd00214a
M. Carosso _{1,

2,

3,

4,

5} , A. Lazzarini _{1,

2,

3,

4,

5} , A. Piovano _{6,

7,

8} , R. Pellegrini _{5,

9,

10} , S. Morandi _{1,

2,

3,

4,

5} , M. Manzoli _{2,

3,

4,

5,

11} , J. G. Vitillo _{1,

2,

3,

4,

5} , M. Jimenez Ruiz _{5,

9,

10} , C. Lamberti _{3,

5,

12,

13,

14} , E. Groppo _{1,

2,

3,

4,

5}

Affiliation

We looked for the active hydrogen species in a highly dispersed and very homogeneous 5 wt% Pt/C industrial catalyst (Pt particle mean diameter of 2.0 ± 0.5 nm) for hydrogenation reactions, by coupling H₂ adsorption measurements with Inelastic Neutron Scattering (INS). Taking advantage of the enormous progress undergone by INS instruments, we succeeded in collecting INS spectra of unprecedented quality that allowed us to: (1) demonstrate that the Pt nanoparticles are mainly located at the regular edges of the sp² graphitic domains on the activated carbon; (2) validate that most of the H₂ physisorbed on the carbon is side-on adsorbed; (3) detect for the first time H₂ molecules adsorbed on hydride-covered Pt nanoparticles; (4) observe Pt–hydrides (on the Pt/C catalyst with the lowest Pt loading among those investigated by INS so far) and (5) provide evidence for the occurrence of spillover of atomic hydrogen from the Pt surface to unsaturated reactive sites located at the irregular borders of the sp² domains on the activated carbon.

中文翻译：

在5 wt％Pt / C催化剂中寻找活性氢物质：非弹性中子散射的挑战

我们通过将H ₂吸附测量值与非弹性中子散射（INS）耦合，在高度分散且非常均匀的5 wt％Pt / C工业催化剂（Pt颗粒平均直径为2.0±0.5 nm）中寻找活性氢物种。。利用INS仪器所取得的巨大进步，我们成功收集了前所未有的质量的INS光谱，这使我们能够：（1）证明Pt纳米颗粒主要位于活性炭上sp ²石墨域的规则边缘。; （2）验证物理吸附在碳上的大多数H ₂是侧面吸附的；（3）首次检测H ₂吸附在氢化物覆盖的Pt纳米颗粒上的分子；（4）观察到Pt-氢化物（到目前为止，在INS所研究的催化剂中，Pt / C催化剂上的Pt负载最低）和（5）提供了证据，表明发生了原子氢从Pt表面溢出到所定位的不饱和反应位点的现象。在活性炭上sp ²结构域的不规则边界处。

更新日期：2018-09-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11