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Confined Ultrathin Pd‐Ce Nanowires with Outstanding Moisture and SO 2 Tolerance in Methane Combustion
Author(s) -
Peng Honggen,
Rao Cheng,
Zhang Ning,
Wang Xiang,
Liu Wenming,
Mao Wenting,
Han Lu,
Zhang Pengfei,
Dai Sheng
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201803393
Subject(s) - nanowire , materials science , methane , catalysis , sintering , chemical engineering , catalytic combustion , combustion , moisture , noble metal , oxide , water vapor , porosity , nanotechnology , metal , metallurgy , composite material , chemistry , organic chemistry , engineering
An efficient strategy (enhanced metal oxide interaction and core–shell confinement to inhibit the sintering of noble metal) is presented confined ultrathin Pd‐CeO x nanowire (2.4 nm) catalysts for methane combustion, which enable CH 4 total oxidation at a low temperature of 350 °C, much lower than that of a commercial Pd/Al 2 O 3 catalyst (425 °C). Importantly, unexpected stability was observed even under harsh conditions (800 °C, water vapor, and SO 2 ), owing to the confinement and shielding effect of the porous silica shell together with the promotion of CeO 2 . Pd‐CeO x solid solution nanowires (Pd‐Ce NW) as cores and porous silica as shells (Pd‐CeNW@SiO 2 ) were rationally prepared by a facile and direct self‐assembly strategy for the first time. This strategy is expected to inspire more active and stable catalysts for use under severe conditions (vehicle emissions control, reforming, and water–gas shift reaction).