Platinum-Supported Zirconia Nanotube Arrays Supported on Graphene Aerogels Modified with Metal–Organic Frameworks: Adsorption and Oxidation of Formaldehyde at Room Temperature

Haocun Tan, 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 (P.R. China)

Chem. Eur. J. 2019, 25, 16718--16724

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 708C (T90% =708C). 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

链接：https://onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201904426