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Nanocage‐Shaped Co 3− x Zr x O 4 Solid‐Solution Supports Loaded with Pt Nanoparticles as Effective Catalysts for the Enhancement of Toluene Oxidation
Author(s) -
Wang Mengmeng,
Chen Dongyun,
Li Najun,
Xu Qingfeng,
Li Hua,
He Jinghui,
Lu Jianmei
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202005715
Subject(s) - nanocages , catalysis , materials science , solid solution , toluene , nanoparticle , space velocity , nanocomposite , platinum , catalytic combustion , crystallography , chemical engineering , nuclear chemistry , nanotechnology , chemistry , selectivity , metallurgy , organic chemistry , engineering
Nanocage‐shaped Co 3− x Zr x O 4 solid‐solution supports and the corresponding platinum loaded nanocomposites, y Pt/Co 3− x Zr x O 4 ( x =0.27, 0.50, 0.69; y = 0.5, 1.0, 2.0 wt.%), are successfully fabricated via a Cu 2 O nanocube hard template method and a glycol reduction method, respectively. The hollow nanocage structures obviously improve surface areas; moreover, the Zr doping forms the Co 3− x Zr x O 4 solid‐solution supports, and the corresponding y Pt/Co 3− x Zr x O 4 catalysts promote the enhancement of catalytic performance. Catalytic activity toward toluene combustion is enhanced for the 2.0 wt% Pt/Co 2.73 Zr 0.27 O 4 catalyst. The catalysts are characterized using multiple techniques. Pt nanoparticles are uniformly dispersed across the Co 2.73 Zr 0.27 O 4 nanocage surface. The 2.0 wt% Pt/Co 2.73 Zr 0.27 O 4 catalyst exhibits the highest catalytic activity among all the samples and demonstrates good stability, with 90% toluene conversion obtained at a temperature of 165 °C. The same catalyst accomplishes full toluene oxidation at 180 °C, at a weight hourly space velocity of 36 000 mL h −1 g −1 . The apparent activation energy ( E a ) over the y Pt/Co 2.73 Zr 0.27 O 4 samples are significantly lower than those over the Co 3− x Zr x O 4 supports, with the 2.0 wt% Pt/Co 2.73 Zr 0.27 O 4 catalyst exhibiting the lowest E a value. These findings demonstrate the potential of the 2.0 wt% Pt/Co 2.73 Zr 0.27 O 4 catalyst as a promising catalyst toward atmospheric toluene removal.