Catalyst Supraparticles: Tuning the Structure of Spray-Dried Pt/SiO2 Supraparticles via Salt-Based Colloidal Manipulation to Control their Catalytic Performance

Groppe P, Reichstein J, Carl S, Cuadrado Collados C, Niebuur BJ, Zhang K, Apeleo Zubiri B, Libuda J, Kraus T, Retzer T, Thommes M, Spiecker E, Wintzheimer S, Mandel K (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Small Wiley-VCH Verlag

DOI: 10.1002/smll.202310813

Abstract

The structure of supraparticles (SPs) 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. In particular, 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.

Authors with CRIS profile

Philipp Groppe Professur für Anorganische Chemie Jakob Reichstein Professur für Anorganische Chemie Simon Carl Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Carlos Cuadrado Collados Lehrstuhl für Thermische Verfahrenstechnik (TVT) Kailun Zhang Lehrstuhl für Katalytische Grenzflächenforschung Benjamin Apeleo Zubiri Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung Tanja Retzer Lehrstuhl für Katalytische Grenzflächenforschung Matthias Thommes Lehrstuhl für Thermische Verfahrenstechnik (TVT) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Susanne Wintzheimer Professur für Anorganische Chemie Karl Mandel Professur für Anorganische Chemie

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Nanoanalysis and Electron Microscopy (CENEM) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Related research project(s)

Scale-bridging tomography and in situ microscopy of SCALMS (A03) (SFB 1452 CLINT A03) Catalysis at Liquid Interfaces (CLINT) (SFB 1452 CLINT) Jan. 1, 2021 - Dec. 31, 2024 Microscopic 3D characterisation of functional particles and pore structures (SFB 1411 - C01) Design of particulate products (SFB 1411) Jan. 1, 2020 - Dec. 31, 2023

Involved external institutions

Leibniz-Institut für Neue Materialien gGmbH / Leibniz Institute for New Materials (INM) DE Germany (DE)

How to cite

APA:

Groppe, P., Reichstein, J., Carl, S., Cuadrado Collados, C., Niebuur, B.J., Zhang, K.,... Mandel, K. (2024). Catalyst Supraparticles: Tuning the Structure of Spray-Dried Pt/SiO2 Supraparticles via Salt-Based Colloidal Manipulation to Control their Catalytic Performance. Small. https://doi.org/10.1002/smll.202310813

MLA:

Groppe, Philipp, et al. "Catalyst Supraparticles: Tuning the Structure of Spray-Dried Pt/SiO2 Supraparticles via Salt-Based Colloidal Manipulation to Control their Catalytic Performance." Small (2024).

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