INFLUENCE OF SILVER PRECURSORS INTRODUCING METHOD ON PROPERTIES OF MAGNETICALLY RECOVERABLE Ag/FeOx CATALYSTS IN 4-NITROPHENOL REDUCTION

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Abstract

The conducted study aims to compare the properties of magnetically recoverable Ag/FeOx catalysts obtained by different synthesis approaches (impregnation, coprecipitation, and impregnation of the pre-reduced support), and to test their activity in 4-nitrophenol reduction in aqueous solution at room temperature. The most active catalysts in 4-nitrophenol reduction are the samples obtained by impregnation with Ag precursors of the pure support (k = 2.19 min−1) and the pre-reduced one in H2/Ar flow at 250°C (k = 3.21 min−1). This is due to the in situ formation of dispersed and active Ag particles from the cationic precursor under the reducing agent NaBH4 exposure. The nature of the Ag precursors (Ag+ or Ag(NH3)2 +) affects Ag particles' activity. The catalysts in which the ammonia complex Ag(NH3)2 + was used as the silver precursor exhibit lower activity compared to samples in which AgNO3 was used. Differences in thermodynamics and kinetics of Ag+ or Ag(NH3)2 + to Ag0 reduction determine the morphology and dispersion of metallic silver particles, which affects the activity of the resulting catalysts. The presence of magnetic properties in the catalyst samples is shown by the exposure of an external magnetic field.

About the authors

A. V Taratayko

Tomsk State University

Email: taratayko1997@mail.ru
Tomsk, Russia

T. A Kuznetsov

Tomsk State University

Tomsk, Russia

M. V Kozhina

Tomsk State University

Tomsk, Russia

G. V Mamontov

Tomsk State University

Tomsk, Russia

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