SiO2-supported Pd nanoparticles for highly efficient, selective and stable phenol hydrogenation to cyclohexanone
•The Pd/SiO2 catalysts with different Pd contents (Pd-0.16 wt%, 0.26 wt%, 0.52 wt%, 2.60 wt%) are prepared via sodium borohydride reduction.•Highly dispersed Pd nanoparticles are stably loaded on silica support with high specific surface area.•Pd/SiO2 (0.26 wt%) shows good catalytic performance for...
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Published in | Molecular catalysis Vol. 538; p. 112975 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.03.2023
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Subjects | |
Online Access | Get full text |
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Summary: | •The Pd/SiO2 catalysts with different Pd contents (Pd-0.16 wt%, 0.26 wt%, 0.52 wt%, 2.60 wt%) are prepared via sodium borohydride reduction.•Highly dispersed Pd nanoparticles are stably loaded on silica support with high specific surface area.•Pd/SiO2 (0.26 wt%) shows good catalytic performance for selective hydrogenation of phenol under mild reaction conditions (conversion-80.6%, selectivity to cyclohexanone-92.1%, TOF-1106.1 h−1).•Pd/SiO2 is also stable for phenol hydrogenation.
Cyclohexanone is significant chemical reagent for organic synthesis, so it is key to design and prepare a highly active and environmentally friendly catalyst for the conversion of phenol to cyclohexanone. The results in this work show that the Pd-based supported nanocatalysts (Pd/SiO2) with various Pd contents (Pd/SiO2–1 with 0.16 wt% Pd, Pd/SiO2–2 with 0.26 wt% Pd, Pd/SiO2–3 with 0.52 wt% Pd, Pd/SiO2–4 with 2.60 wt% Pd) have high conversion and selectivity in phenol selective hydrogenation to cyclohexanone under relatively moderate reaction parameters, Pd/SiO2–2 with the highest conversion of 80.6%, selectivity of 92.1% and turnover frequency (TOF) of 1106.1 h−1. This excellent activity is attributed to the highly dispersed Pd nanoparticles (NPs) on silica with high surface area. The Pd/SiO2 catalysts are with high Pd dispersion and strong interaction of Pd-SiO2, which have been proved by XRD, XPS, BET, TEM, HRTEM, STEM, STEM-EDS elemental analysis techniques. The as-prepared materials have good catalytic behaviors in the selective hydrogenation of phenol and good stability, facilitating phenol hydrogenation to cyclohexanone and preventing the excessive hydrogenation of cyclohexanone to cyclohexanol.
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ISSN: | 2468-8231 2468-8231 |
DOI: | 10.1016/j.mcat.2023.112975 |