Pt–Ag Bimetallic Catalysts Supported on Mesoporous Silica MCM-41 in 4-Nitrophenol Reduction

Mesoporous silica MCM-41 with a specific surface area of 1134 m 2 /g was prepared. It was used to manufacture supported mono- and bimetallic Pt–Ag catalysts with various metal ratios by incipient wetness impregnation. After the reductive high-temperature treatment of Pt–Ag catalysts, Pt and Ag metal...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2024-11, Vol.69 (11), p.1754-1761
Main Authors: Savel’eva, A. S., Evdokimova, E. V., Mamontov, G. V.
Format: Article
Language:English
Subjects:
Bimetals
Catalysts
Chemistry
Chemistry and Materials Science
High temperature
Inorganic Chemistry
Inorganic Materials and Nanomaterials
Nitrophenol
Platinum
Silicon dioxide
Silver
Synergistic effect
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Summary:Mesoporous silica MCM-41 with a specific surface area of 1134 m 2 /g was prepared. It was used to manufacture supported mono- and bimetallic Pt–Ag catalysts with various metal ratios by incipient wetness impregnation. After the reductive high-temperature treatment of Pt–Ag catalysts, Pt and Ag metal nanoparticles contacting with one another were formed on the surface of the support as shown by X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS). The bimetallic catalysts showed an increased reactivity in TPR-H 2 compared to the relevant monometallic catalysts due to the interaction of AgO x and PtO y centers. The catalysts were tested in the reduction of 4-nitrophenol with sodium borohydride. A significant increase in 4-nitrophenol reduction rate over bimetallic catalysts was due to the synergistic effect of platinum and silver.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023624602356