The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen

Luty–Błocho, Magdalena; Szot, Aleksandra; Hessel, Volker; Fitzner, K.

doi:10.3390/ma16134630

Cited by 2 publications

(3 citation statements)

References 42 publications

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“…The value of the absorbance decreased twice. It seems that about 50% of Pt(IV) ions were reduced to Pt(II) and/or underwent hydrolysis, in which [PtCl 6 ] 2– was transformed to [PtCl 5 H 2 O] − . The change in the Pt(IV) content may also indicate the reduction of the ions to Pt.…”

Section: Resultsmentioning

confidence: 99%

“…It seems that about 50% of Pt(IV) ions were reduced to Pt(II) and/or underwent hydrolysis, in which [PtCl 6 ] 2− was transformed to [PtCl 5 H 2 O] − . 59 The change in the Pt(IV) content may also indicate the reduction of the ions to Pt. Another interesting aspect relates to a possible galvanic replacement process.…”

Section: Catalyst Synthesis and Its Deposition On Acf In The Batchmentioning

confidence: 99%

“…This process is also much faster compared to the process of Pt(IV) to Pt(II) ions reduction using ascorbic acid. 59 Thus, in the next step (step III), we consider two processes. The first one is a galvanic replacement (eqs 5 and 6).…”

Section: Uv−vis Dls and Mp-aes Analyses Of Waste Solutionmentioning

confidence: 99%

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One-Step Synthesis of Pt–Pd@ACF Catalyst in the Microreactor System for the Hydrogen Evolution Reaction

Pach,

Zaryczny,

Michałek

et al. 2024

Ind. Eng. Chem. Res.

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Currently, new technologies for catalyst synthesis for the production of green energy are being sought. Platinum-based materials are of particular interest due to their unique catalytic properties. In this work, a one-step synthesis of a bimetallic Pt−Pd@ACF (ACF = activated carbon fibers) catalyst in the microreactor system was demonstrated. For this purpose, a glass microreactor was applied, and synthesized catalysts were analyzed using the following techniques: spectrophotometry, TEM, SEM, DLS, XRD, and MP-AES (microwave plasma atomic emission spectroscopy). The obtained results showed that the process of catalyst deposition on ACF as a catalyst carrier is more efficient in the microreactor system compared to the analogous process carried out in a batch reactor. Moreover, the composition of the catalyst can be slightly changed with the flow rate. It contained 32% of Pt and 68% of Pd for a flow rate of 5 mL/min and 33% of Pt and 67% of Pd for the lowest flow rate, i.e., 1 mL/min. While the amount of catalyst deposited on ACF can be adjusted by using the flow rate in the order from the lowest to the highest. The catalytic properties of the catalyst were tested for the hydrogen evolution reaction (HER). The catalytic performance of the synthesized material was directly related to its amount on the carbon surface. The highest catalytic activity was observed for the catalyst synthesized at a flow rate of 5.0 mL/min, and the registered current for HER achieved −25 mA at a potential of −0.28 V.

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Section: Resultsmentioning

confidence: 99%

Section: Catalyst Synthesis and Its Deposition On Acf In The Batchmentioning

confidence: 99%

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One-Step Synthesis of Pt–Pd@ACF Catalyst in the Microreactor System for the Hydrogen Evolution Reaction

Pach,

Zaryczny,

Michałek

et al. 2024

Ind. Eng. Chem. Res.

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Opportunities and Challenges in the Synthesis of Noble Metal Nanoparticles via the Chemical Route in Microreactor Systems

Pach,

Szot,

Fitzner

et al. 2024

Micromachines

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The process of noble metal nanoparticle synthesis is complex and consists of at least two steps: slow nucleation and fast autocatalytic growth. The kinetics of these two processes depends on the reductant “power” and the addition of stabilizers, as well as other factors (e.g., temperature, pH, ionic strength). Knowing these parameters, it is possible to synthesize materials with appropriate physicochemical properties, which can be simply adjusted by the type of the used metal, particle morphology and surface property. This, in turn, affects the possibility of their applications in various areas of life, including medicine, catalysis, engineering, fuel cells, etc. However, in some cases, the standard route, i.e., the chemical reduction of a metal precursor carried out in the batch reactor, is not sufficient due to problems with temperature control, properties of reagents, unstable or dangerous intermediates and products, etc. Therefore, in this review, we focused on an alternative approach to their chemical synthesis provided by microreactor systems. The use of microreactors for the synthesis of noble metal nanomaterials (e.g., Ag, Au, Pt, Pd), obtained by chemical reduction, is analyzed, taking into account investigations carried out in recent years. A particular emphasis is placed on the processes in which the use of microreactors removed the limitations associated with synthesis in a batch reactor. Moreover, the opportunities and challenges related to the synthesis of noble nanomaterials in the microreactor system are underlined. This review discusses the advantages as well as the problems of nanoparticle synthesis in microreactors.

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The Kinetics of the Redox Reaction of Platinum(IV) Ions with Ascorbic Acid in the Presence of Oxygen

Cited by 2 publications

References 42 publications

One-Step Synthesis of Pt–Pd@ACF Catalyst in the Microreactor System for the Hydrogen Evolution Reaction

One-Step Synthesis of Pt–Pd@ACF Catalyst in the Microreactor System for the Hydrogen Evolution Reaction

Opportunities and Challenges in the Synthesis of Noble Metal Nanoparticles via the Chemical Route in Microreactor Systems

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