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Platinum‐Supported Zirconia Nanotube Arrays Supported on Graphene Aerogels Modified with Metal–Organic Frameworks: Adsorption and Oxidation of Formaldehyde at Room Temperature
Author(s) -
Tan Haocun,
Chen Dongyun,
Li Najun,
Xu Qingfeng,
Li Hua,
He Jinghui,
Lu Jianmei
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904426
Subject(s) - aerogel , materials science , catalysis , chemical engineering , platinum , graphene , mesoporous material , adsorption , oxidizing agent , composite number , cubic zirconia , formaldehyde , inorganic chemistry , nanotechnology , composite material , chemistry , organic chemistry , ceramic , engineering
Precious‐metal catalysts (e.g., Au, Rh, Ag, Ru, Pt, and Pd) supported on transition‐metal oxides (e.g., Al 2 O 3 , Fe 2 O 3 , CeO 2 , ZrO 2 , Co 3 O 4 , MnO 2 , TiO 2 , and NiO) can effectively oxidize volatile organic compounds. In this study, porous platinum‐supported zirconia materials have been prepared by a “surface‐casting” method. The synthesized catalysts present an ordered nanotube structure and exhibited excellent performance toward the catalytic oxidation of formaldehyde. A facile method, utilizing a boiling water bath, was used to fabricate graphene aerogel (GA), and the macroscopic 3D Pt/ZrO 2 ‐GA was modified by introducing an adjustable MOF coating by a surface step‐by‐step method. The unblocked mesoporous structure of the graphene aerogel facilitates the ingress and egress of reactants and product molecules. The selected 7 wt.% Pt/ZrO 2 ‐GA‐MOF‐5 composite demonstrated excellent performance for HCHO adsorption. Additionally, this catalyst achieved around 90 % conversion when subjected to a reaction temperature of 70 °C ( T 90 % =70 °C). The Pt/ZrO 2 ‐GA‐MOF‐5 composite induces a catalytic cycle, increasing the conversion by simultaneously adsorbing and oxidizing HCHO. This work provides a simple approach to increasing reactant concentration on the catalyst to increase the rate of reaction.