英国圣安德鲁斯大学John T. S. Irvine团队通过钛酸钙钛矿中掺入铂制备出活性稳定的铂纳米粒子。相关研究成果发表在2021年5月24日出版的国际学术期刊《自然—化学》。

铂作为一种纳米颗粒催化剂在许多重要领域发挥着非常好的作用，例如在去除大气污染物方面，但它稀缺、昂贵且不耐用。

该文中，研究人员报道了一种钙钛矿体系，其中0.5wt%Pt被整合到载体中，并且随后通过脱溶将其转化为弹性催化剂。由于大多数铂氧化物在高温下不稳定，一种热稳定的铂氧化物前体铂酸钡被用于在固态合成过程中以氧化物的形式保存铂，其方法类似于特洛伊木马传说。通过调整程序，有可能产生一个均匀的平衡结构，活性涌现的Pt纳米粒子牢牢嵌入钙钛矿表面，显示出比传统制备的Pt催化剂更好的CO氧化活性和稳定性。进一步评价了该催化剂在CO和NO氧化、柴油氧化催化和氨滑移反应等实际试验环境下的各种反应。

附：英文原文

Title: Platinum incorporation into titanate perovskites to deliver emergent active and stable platinum nanoparticles

Author: Maadhav Kothari, Yukwon Jeon, David N. Miller, Andrea Eva Pascui, John Kilmartin, David Wails, Silvia Ramos, Alan Chadwick, John T. S. Irvine

Issue&Volume: 2021-05-24

Abstract: Platinum functions exceptionally well as a nanoparticulate catalyst in many important fields, such as in the removal of atmospheric pollutants, but it is scarce, expensive and not always sufficiently durable. Here, we report a perovskite system in which 0.5wt% Pt is integrated into the support and its subsequent conversion through exsolution to achieve a resilient catalyst. Owing to the instability of most Pt oxides at high temperatures, a thermally stable platinum oxide precursor, barium platinate, was used to preserve the platinum as an oxide during the solid-state synthesis in an approach akin to the Trojan horse legend. By tailoring the procedure, it is possible to produce a uniform equilibrated structure with active emergent Pt nanoparticles strongly embedded in the perovskite surface that display better CO oxidation activity and stability than those of conventionally prepared Pt catalysts. This catalyst was further evaluated for a variety of reactions under realistic test environments—CO and NO oxidation, diesel oxidation catalysis and ammonia slip reactions were investigated.

DOI: 10.1038/s41557-021-00696-0

Source: https://www.nature.com/articles/s41557-021-00696-0