Highly Efficient Catalysts of Bimetallic Pt−Ru Nanocrystals Supported on Ordered ZrO2 Nanotube for Toluene Oxidation

Mengmeng Wang, Dongyun Chen^*（陈冬赟）, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, and Jianmei Lu^*（路建美）

College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China

ACS Appl. Mater. Interfaces2020,12, 13781--13789

ZrO₂ nanotube arrays and their supported bimetallic platinum and ruthenium (Pt_xRu_y/ZrO₂; x + y = 1 mmol %, x/y = 1:0, 0.9:0.1, 0.8:0.2, 0.7:0.3, 0.5:0.5, 0:1) nanocomposites were fabricated by employing SBA-15-OH as a hard template and an impregnation method, respectively. A controlled ordered nanotube array structure formed from the fabricated catalysts, and it showed a good performance for toluene oxidation. The specific physicochemical properties of the catalysts were examined through various analytical means. The Pt_xRu_y/ZrO₂ possessed a high surface area, and the Pt–Ru nanoparticles were dispersed uniformly on the ZrO₂ nanotube surface. The Pt_0.7Ru_0.3/ZrO₂ catalyst performed best among all of the samples, with T_90% and T_100% (temperatures for 90 and 100% conversion of toluene) of 140 and 160 °C, respectively, at a weight hourly space velocity of 36 000 mL/(h·g). These bimetallic catalysts exhibit excellent characteristics for toluene oxidation, such as higher turnover frequencies and lower apparent activation energy (E_a) values, which probably result from the synergistic effect of the Pt–Ru noble metals that leads to a high reducibility and oxygen adsorption capacity. The excellent activity, stability, and economics of the Pt_0.7Ru_0.3/ZrO₂ catalyst allow for its application in toluene removal.

链接：https://pubs.acs.org/doi/10.1021/acsami.9b20929