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Small:MOF Isomers: Pt / CeO2 composite catalyst based on isomeric MOF for low temperature catalytic oxidation of CO

wallpapers Cruise 2020-08-24

metal organic frameworks (MOFs) are three-dimensional crystalline porous materials formed by self-assembly of metal ions organic ligs through coordination bonds. MOFs are widely used in catalysis due to their controllable pore structure crystal form low density large specific surface area. Based on the synergistic catalytic effect many reports have combined MOFs with various catalytic active nanoparticles (NPS) to construct integrated nanocatalysts to improve their catalytic performance. The coordination environment of MOFs is very important for the catalytic performance MOF isomers refer to MOFs with different spatial structures produced by the same chemical components (metal ions organic ligs) through different coordination ways. However the effect of isomerization of MOFs on the loading efficiency catalytic activity of noble metal nanoparticles is limited.

in view of this Professor Zhan Guowu's research group of Huaqiao University successfully prepared two kinds of CE BTC (MOF isomers) with different topologies by controlling the reaction solvent using pyromellitic acid as organic lig cerium nitrate as metal ion source then loaded Pt Nanoparticles successfully prepared three kinds of Pt / CeO2 nano catalysts with different morphologies after high temperature calcination. It was found that the reaction solvent significantly affected the crystal form pore structure of MOF then affected the particle size loading efficiency physicochemical properties of Pt nanoparticles. Based on the characterization of XRD FTIR Raman the transformation mechanism between different crystal forms of CE BTC was explored. It was observed that the irreversible transformation between isomers (from tetragonal to monoclinic) of CE BTC occurred during water immersion treatment. The mechanism of CO catalytic oxidation of its derivative Pt / CeO2 was further studied by XPS H2-TPR characterization. It was proved that the Pt / CeO2 Catalyst based on tetragonal CE BTC had a large number of pT0 species small Pt nanoparticles on the surface which significantly promoted CO catalytic oxidation. In situ drifts analysis showed that co-pt0 adsorbed state was the main intermediate of CO oxidation at low temperature. Similarly similar MOF isomers were found in other ln MOFs (LN = EU er y ce-y) which proved the universality of the synthesis method of isomeric MOFs. The work of

provides a new idea for the catalytic research of isomeric MOF calcined derivatives has a certain guiding significance for the subsequent design of MOF / NP composites their derivatives.

Professor Zhan Guowu was selected as the distinguished professor of Minjiang scholars in Fujian Province the high-level talents introduced from Fujian Province the overseas high-level talents of Xiamen Shuangbai plan the outsting young talents of Xiamen. He is mainly engaged in CO2 gas-phase catalytic hydrogenation preparation of nano materials by biological template synthesis of multi-stage porous molecular sieves other related research. He has published more than 50 SCI papers as the first author or corresponding author including NAT. Commun. adv. mater. ACS catalyst. adv. function. Mater. ACS center. SCI. small etc. Website of research group: https://www.zhan-group.com/

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