Rhenium Nanostructures Loaded into Amino-Functionalized Resin as a Nanocomposite Catalyst for Hydrogenation of 4-Nitrophenol and 4-Nitroaniline
The present work presents a new nanocomposite catalyst with rhenium nanostructures (ReNSs) for the catalytic hydrogenation of 4-nitrophenol and 4-nitroaniline. The catalyst, based on an anion exchange resin with functionality derived from 1,1′-carboimidazole, was obtained in the process involving an...
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| Main Authors: | , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/4cbb957c9c994ed08ac3e647633e4cc9 |
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| Summary: | The present work presents a new nanocomposite catalyst with rhenium nanostructures (ReNSs) for the catalytic hydrogenation of 4-nitrophenol and 4-nitroaniline. The catalyst, based on an anion exchange resin with functionality derived from 1,1′-carboimidazole, was obtained in the process involving anion exchange of ReO<sub>4</sub><sup>–</sup> ions followed by their reduction with NaBH<sub>4</sub>. The amino functionality present in the resin played a primary role in the stabilization of the resultant ReNSs, consisting of ≈1% (<i>w/w</i>) Re in the polymer mass. The synthesized and capped ReNSs were amorphous and had the average size of 3.45 ± 1.85 nm. Then, the obtained catalyst was used in a catalytic reduction of 4-nitrophenol (4-NP) and 4-nitroaniline (4-NA). Following the pseudo-first-order kinetics, 5 mg of the catalyst led to a 90% conversion of 4-NP with the mass-normalized rate constant (k<sub>m1</sub>) of 6.94 × 10<sup>−3</sup> min<sup>−1</sup> mg<sup>−1</sup>, while the corresponding value acquired for 4-NA was 7.2 × 10<sup>−3</sup> min<sup>−1</sup> mg<sup>−1</sup>, despite the trace amount of Re in the heterogenous catalyst. The obtained material was also conveniently reused. |
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