铂在SnO和FeO纳米材料中的固态分散体。

Solid-State Dispersions of Platinum in the SnO and FeO Nanomaterials.

作者信息

Radin Edi, Štefanić Goran, Dražić Goran, Marić Ivan, Jurkin Tanja, Pustak Anđela, Baran Nikola, Raić Matea, Gotić Marijan

机构信息

Laboratory for Molecular Physics and Synthesis of New Materials, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia.

National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.

出版信息

Nanomaterials (Basel). 2021 Dec 10;11(12):3349. doi: 10.3390/nano11123349.

DOI:10.3390/nano11123349

PMID:34947698

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8704069/

Abstract

The dispersion of platinum (Pt) on metal oxide supports is important for catalytic and gas sensing applications. In this work, we used mechanochemical dispersion and compatible Fe(II) acetate, Sn(II) acetate and Pt(II) acetylacetonate powders to better disperse Pt in FeO and SnO. The dispersion of platinum in SnO is significantly different from the dispersion of Pt over FeO. Electron microscopy has shown that the elements Sn, O and Pt are homogeneously dispersed in α-SnO (cassiterite), indicating the formation of a (Pt,Sn)O solid solution. In contrast, platinum is dispersed in α-FeO (hematite) mainly in the form of isolated Pt nanoparticles despite the oxidative conditions during annealing. The size of the dispersed Pt nanoparticles over α-FeO can be controlled by changing the experimental conditions and is set to 2.2, 1.2 and 0.8 nm. The rather different Pt dispersion in α-SnO and α-FeO is due to the fact that Pt can be stabilized in the α-SnO structure by replacing Sn with Pt in the crystal lattice, while the substitution of Fe with Pt is unfavorable and Pt is mainly expelled from the lattice at the surface of α-FeO to form isolated platinum nanoparticles.

摘要

铂（Pt）在金属氧化物载体上的分散对于催化和气体传感应用很重要。在这项工作中，我们使用机械化学分散法以及相容性的乙酸亚铁、乙酸锡和乙酰丙酮铂粉末，以便更好地将Pt分散在FeO和SnO中。铂在SnO中的分散与Pt在FeO上的分散显著不同。电子显微镜显示，元素Sn、O和Pt均匀分散在α-SnO（锡石）中，表明形成了(Pt,Sn)O固溶体。相比之下，尽管退火过程中存在氧化条件，但铂主要以孤立的Pt纳米颗粒形式分散在α-FeO（赤铁矿）中。通过改变实验条件，可以控制α-FeO上分散的Pt纳米颗粒的尺寸，其尺寸设定为2.2、1.2和0.8纳米。α-SnO和α-FeO中Pt分散情况差异较大，原因在于Pt可以通过在晶格中取代Sn而稳定在α-SnO结构中，而用Pt取代Fe则不利，Pt主要从α-FeO表面的晶格中排出，形成孤立的铂纳米颗粒。