Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances

Research output: Contribution to journalConference abstract in journal – Annual report year: 2018Researchpeer-review

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Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances. / Quinson, Jonathan; Neumann, Sarah; Bucher, Jan; Inaba, Masanori; Simonsen, Søren; Kuhn, Luise Theil; Oezaslan, Mehtap; Kunz, Sebastian; Arenz, Matthias.

In: American Chemical Society. Abstracts of Papers (at the National Meeting), Vol. 256, 2018.

Research output: Contribution to journalConference abstract in journal – Annual report year: 2018Researchpeer-review

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@article{208a5e46a58340fd98559c80c6cdc812,
title = "Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances",
abstract = "To optimize precious metal nanocatalysts, an optimal set of nanoparticle (NP) properties (composition, size, loading, etc.) must match specific operating conditions. Synthesis routes offering independent control on NP properties are then highly desired: (1) to study which combinations of properties are key for an application, (2) to optimize performances, (3) to develop industrial applications if the production method is scalable.Independent control on heterogeneous catalysts' properties is challenging with the direct formation of NPs on supports: agglomeration and NP formation in pores lead to underutilization of the precious metal under catalytic operation.Our strategy is to use colloids to optimise independently several physical properties of the NPs.Yet in colloidal productions, surfactants are typically required and need to be removed in energy and time consuming steps, resulting in loss of catalytic performances due to sintering and poisoning.A surfactant-free colloidal synthesis adressing the previous challenges is presented. Pt NPs are obtained at low temperature (< 80 C) in alkaline mono-alcohols. The method is robust, reproducible, promisingly scalable and flexible (e.g. using microwaves, hot water bath, UV irradiation, flow systems). The mono-alcohol synthesis shows multiple benefits over alternative routes. It is interestingly sensitive to parameters screened in other approaches. The influence of solvents, time of synthesis and nature of base to achieve NP size in the range 1-6 nm and colloidal stability over several months, including in aqueous media, are detailed. The NPs are characterized by TEM, STEM, FTIR, SAXS, PDF, XAS, and electrochemical methods.The energy, time and cost effective production of NPs in low boiling point solvents leads to improved catalytic performances compared to industrial benchmark for chemical production (butanone hydrogenation) and energy conversion (oxygen reduction).",
author = "Jonathan Quinson and Sarah Neumann and Jan Bucher and Masanori Inaba and S{\o}ren Simonsen and Kuhn, {Luise Theil} and Mehtap Oezaslan and Sebastian Kunz and Matthias Arenz",
note = "Division of Colloid & Surface Chemistry (COLL): Basic Research in Colloids, Surfactants & Nanomaterials - Paper number 503",
year = "2018",
language = "English",
volume = "256",
journal = "American Chemical Society. Abstracts of Papers (at the National Meeting)",
issn = "0065-7727",
publisher = "American Chemical Society",

}

RIS

TY - ABST

T1 - Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances

AU - Quinson, Jonathan

AU - Neumann, Sarah

AU - Bucher, Jan

AU - Inaba, Masanori

AU - Simonsen, Søren

AU - Kuhn, Luise Theil

AU - Oezaslan, Mehtap

AU - Kunz, Sebastian

AU - Arenz, Matthias

N1 - Division of Colloid & Surface Chemistry (COLL): Basic Research in Colloids, Surfactants & Nanomaterials - Paper number 503

PY - 2018

Y1 - 2018

N2 - To optimize precious metal nanocatalysts, an optimal set of nanoparticle (NP) properties (composition, size, loading, etc.) must match specific operating conditions. Synthesis routes offering independent control on NP properties are then highly desired: (1) to study which combinations of properties are key for an application, (2) to optimize performances, (3) to develop industrial applications if the production method is scalable.Independent control on heterogeneous catalysts' properties is challenging with the direct formation of NPs on supports: agglomeration and NP formation in pores lead to underutilization of the precious metal under catalytic operation.Our strategy is to use colloids to optimise independently several physical properties of the NPs.Yet in colloidal productions, surfactants are typically required and need to be removed in energy and time consuming steps, resulting in loss of catalytic performances due to sintering and poisoning.A surfactant-free colloidal synthesis adressing the previous challenges is presented. Pt NPs are obtained at low temperature (< 80 C) in alkaline mono-alcohols. The method is robust, reproducible, promisingly scalable and flexible (e.g. using microwaves, hot water bath, UV irradiation, flow systems). The mono-alcohol synthesis shows multiple benefits over alternative routes. It is interestingly sensitive to parameters screened in other approaches. The influence of solvents, time of synthesis and nature of base to achieve NP size in the range 1-6 nm and colloidal stability over several months, including in aqueous media, are detailed. The NPs are characterized by TEM, STEM, FTIR, SAXS, PDF, XAS, and electrochemical methods.The energy, time and cost effective production of NPs in low boiling point solvents leads to improved catalytic performances compared to industrial benchmark for chemical production (butanone hydrogenation) and energy conversion (oxygen reduction).

AB - To optimize precious metal nanocatalysts, an optimal set of nanoparticle (NP) properties (composition, size, loading, etc.) must match specific operating conditions. Synthesis routes offering independent control on NP properties are then highly desired: (1) to study which combinations of properties are key for an application, (2) to optimize performances, (3) to develop industrial applications if the production method is scalable.Independent control on heterogeneous catalysts' properties is challenging with the direct formation of NPs on supports: agglomeration and NP formation in pores lead to underutilization of the precious metal under catalytic operation.Our strategy is to use colloids to optimise independently several physical properties of the NPs.Yet in colloidal productions, surfactants are typically required and need to be removed in energy and time consuming steps, resulting in loss of catalytic performances due to sintering and poisoning.A surfactant-free colloidal synthesis adressing the previous challenges is presented. Pt NPs are obtained at low temperature (< 80 C) in alkaline mono-alcohols. The method is robust, reproducible, promisingly scalable and flexible (e.g. using microwaves, hot water bath, UV irradiation, flow systems). The mono-alcohol synthesis shows multiple benefits over alternative routes. It is interestingly sensitive to parameters screened in other approaches. The influence of solvents, time of synthesis and nature of base to achieve NP size in the range 1-6 nm and colloidal stability over several months, including in aqueous media, are detailed. The NPs are characterized by TEM, STEM, FTIR, SAXS, PDF, XAS, and electrochemical methods.The energy, time and cost effective production of NPs in low boiling point solvents leads to improved catalytic performances compared to industrial benchmark for chemical production (butanone hydrogenation) and energy conversion (oxygen reduction).

M3 - Conference abstract in journal

VL - 256

JO - American Chemical Society. Abstracts of Papers (at the National Meeting)

JF - American Chemical Society. Abstracts of Papers (at the National Meeting)

SN - 0065-7727

ER -