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Titel: Catalyst supraparticles: Tuning the structure of spray-driedPt/SiO2 supraparticles via salt-based colloidal manipulation to control their catalytic performance
VerfasserIn: Groppe, Philipp
Reichstein, Jakob
Carl, Simon
Cuadrado Collados, Carlos
Niebuur, Bart-Jan
Zhang, Kailun
Apeleo Zubiri, Benjamin
Libuda, Jörg
Kraus, Tobias UdsID
Retzer, Tanja
Thommes, Matthias
Spiecker, Erdmann
Wintzheimer, Susanne
Mandel, Karl
Sprache: Englisch
Verlag/Plattform: ChemRxiv
Erscheinungsjahr: 2024
Freie Schlagwörter: supraparticles
porosity
spray-drying
catalysis
structure control
DDC-Sachgruppe: 540 Chemie
Dokumenttyp: Sonstiges
Abstract: he structure of supraparticles (SP) is a key parameter for achieving advanced functionalities arising from the combination of different nanoparticle (NP) types in one hierarchical entity. However, whenever a droplet-assisted forced assembly approach is used, e.g., spray-drying, the achievable structure is limited by the inherent drying phenomena of the method. Especially, mixed NP dispersions of differently-sized colloids are heavily affected by segregation during the assembly. Herein, the influence of the colloidal arrangement of Pt and SiO2 NPs within a single supraparticulate entity is investigated. A salt-based electrostatic manipulation approach of the utilized NPs is proposed to customize the structure of spray-dried Pt/SiO2 SPs. By this, size-dependent separation phenomena of NPs during solvent evaporation, that limit the catalytic performance in the reduction of 4-nitrophenol, are overcome by achieving even Pt NP distribution. Additionally, the textural properties (pore size and distribution) of the SiO2 pore framework are altered to improve the mass transfer within the material leading to increased catalytic activity. The suggested strategy demonstrates a powerful, material-independent, and universally applicable approach to deliberately customize the structure and functionality of multi-component SP systems. This opens up new ways of colloidal material combinations and structural designs in droplet-assisted forced assembly approaches like spray-drying.
DOI der Erstveröffentlichung: 10.26434/chemrxiv-2024-p3wcl
URL der Erstveröffentlichung: https://chemrxiv.org/engage/chemrxiv/article-details/660e8da321291e5d1d0a5150
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-436967
hdl:20.500.11880/39145
http://dx.doi.org/10.22028/D291-43696
Datum des Eintrags: 10-Dez-2024
Bemerkung/Hinweis: Preprint
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Tobias Kraus
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes



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