Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 72, Pages 16718-16724Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201904426
Keywords
heterogeneous catalysis; metal-organic frameworks; oxidation; platinum; zirconium
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Funding
- National Key R&D Program of China [2017YFC0210901, 2017YFC0210906]
- National Natural Science Foundation of China [51573122, 21722607, 21776190]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJA430014, 17KJA150009]
- Science and Technology Program for Social Development of Jiangsu [BE2015637]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Precious-metal catalysts (e.g., Au, Rh, Ag, Ru, Pt, and Pd) supported on transition-metal oxides (e.g., Al2O3, Fe2O3, CeO2, ZrO2, Co3O4, MnO2, TiO2, 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/ZrO2-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/ZrO2-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 degrees C (T-90 %=70 degrees C). The Pt/ZrO2-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.
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