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Download fileCorrelating the Synthesis, Structure, and Catalytic Performance of Pt–Re/TiO2 for the Aqueous-Phase Hydrogenation of Carboxylic Acid Derivatives
journal contribution
posted on 13.04.2021, 17:35 authored by Moritz
O. Haus, Alexander Meledin, Sebastian Leiting, Yannik Louven, Nico C. Roubicek, Sven Moos, Claudia Weidenthaler, Thomas E. Weirich, Regina PalkovitsPt–Re
bimetallic catalysts have many applications, ranging
from catalytic reforming to the reduction of carboxylic acid derivatives.
However, the exact role of Re in these systems has remained a matter
of discussion, partly due to the plethora of suggested synthesis protocols
and analysis conditions. This study presents an extensive comparison
of such literature protocols and the resulting materials. In detail,
characterization by N2 physisorption, X-ray diffraction,
temperature-programmed reduction, CO pulse chemisorption, Fourier-transform
infrared spectroscopy of adsorbed CO, scanning transmission electron
microscopy, energy-dispersive X-ray spectroscopy, and in
situ X-ray photoelectron spectroscopy is combined with catalytic
testing to yield synthesis–structure–activity correlations.
Accordingly, the investigated catalysts share common features, such
as Pt0 nanoparticles (1–4 nm) decorated with partially
reduced Re species (ReOx–y). The remaining rhenium oxide is spread over the TiO2 support and enhances Pt dispersion in sequential impregnation protocols.
While differences in the number of active sites (Pt0/ReOx–y) mostly explain
catalytic results, small variations in the extent of Re reduction
and site composition cause additional modulations. The optimal bimetallic
catalyst outperforms Ru/C (previous benchmark) in the reduction of N-(2-hydroxyethyl)succinimide, an important step in the
production of a bio-based polyvinylpyrrolidone polymer.
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Keywords
carboxylic acid derivativesbio-based polyvinylpyrrolidone polymercatalysts shareRe speciesenergy-dispersive X-ray spectroscopysequential impregnation protocolsX-ray diffractionrhenium oxideReOanalysis conditionsCO pulse chemisorptionbimetallic catalystN 2 physisorptionsynthesis protocolsAqueous-Phase HydrogenationCatalytic PerformanceTiO 2 supportliterature protocolssite composition causeX-ray photoelectron spectroscopyRe reductionscanning transmission electron micr...temperature-programmed reductionPt dispersion