Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2023 Sep 14;5(20):5649-5660.
doi: 10.1039/d3na00437f. eCollection 2023 Oct 10.

A high activity mesoporous Pt@KIT-6 nanocomposite for selective hydrogenation of halogenated nitroarenes in a continuous-flow microreactor

Kejie Chai  1 , Xilin Yang  1 , Runqiu Shen  1 , Jianli Chen  1   2 , Weike Su  1 , An Su  3
Affiliations

A high activity mesoporous Pt@KIT-6 nanocomposite for selective hydrogenation of halogenated nitroarenes in a continuous-flow microreactor

Kejie Chai et al. Nanoscale Adv. .

Abstract

In this study, we designed a Pt@KIT-6 nanocomposite prepared by impregnating platinum nanoparticles on the nanopores of the KIT-6 mesoporous material. This Pt@KIT-6 nanocomposite was used as a catalyst in a micro fixed bed reactor (MFBR) for the continuous-flow hydrogenation of halogenated nitroarenes, which demonstrates three advantages. First, the Pt@KIT-6 nanocomposite has a stable mesoporous nanostructure, which effectively enhances the active site and hydrogen adsorption capacity. The uniformly distributed pore structure and large specific surface area were confirmed by electron microscopy and N2 physisorption, respectively. In addition, the aggregation of the loaded metal was avoided, which facilitated the maintenance of high activity and selectivity. The conversion and selectivity reached 99% within 5.0 minutes at room temperature (20 °C). Furthermore, the continuous-flow microreactor allows precise control and timely transfer of the reaction system, reducing the impact of haloid acids. The activity and selectivity of the Pt@KIT-6 nanocomposite showed virtually no degradation after 24 hours of continuous operation of the entire continuous-flow system. Overall, the Pt@KIT-6 nanocomposite showed good catalysis for the hydrogenation of halogenated nitroarenes in the continuous-flow microreactor. This work provides insights into the rational design of a highly active and selective catalyst for selective hydrogenation systems.

PubMed Disclaimer

Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1. The MFBR of continuous-flow selective hydrogenation with Pt@KIT-6 nanocomposite.
Fig. 2
Fig. 2. (a) Small-angle XRD pattern of Pt@KIT-6 nanocomposite and KIT-6; (b) wide-angle XRD pattern of Pt@KIT-6 nanocomposite and KIT-6.
Fig. 3
Fig. 3. Pt@KIT-6 nanocomposite: (a) SEM image, (b) TEM image, (c) HRTEM image, (d) SAED pattern; N2 adsorption–desorption isotherms for (e) KIT-6 and (f) Pt@KIT-6 nanocomposite; pore size distributions of (g) KIT-6 and (h) Pt@KIT-6 nanocomposite.
Fig. 4
Fig. 4. (a) EDS elemental mappings of Pt@KIT-6 nanocomposite; XPS spectra of Pt@KIT-6 nanocomposite: (b) Pt 4f, (c) Si 2p, (d) O 1s.
Fig. 5
Fig. 5. Operation time of continuous-flow hydrogenation in a microreactor. Reaction conditions: 4-chloronitrobenzene (0.1 mol L−1, methanol as solvent), catalyst (Pt@KIT-6 nanocomposite, 50 mg), flow rate (0.10 mL min−1), H2 (1.0 MPa), back-pressure (0.9 MPa), 20 °C, 5.0 min.
Fig. 6
Fig. 6. General hydrogenation mechanism of nitroarenes.
See this image and copyright information in PMC

References

    1. Sorribes I. Liu L. C. Corma A. ACS Catal. 2017;7:2698–2708. doi: 10.1021/acscatal.7b00170. - DOI
    1. Markushyna Y. Teutloff C. Kurpil B. Cruz D. Lauermann I. Zhao Y. B. Antonietti M. Savateev A. Appl. Catal., B. 2019;248:211–217. doi: 10.1016/j.apcatb.2019.02.016. - DOI
    1. Zhang S. Chang C. R. Huang Z. Q. Li J. Wu Z. M. Ma Y. Y. Zhang Z. Y. Wang Y. Qu Y. Q. J. Am. Chem. Soc. 2016;138:2629–2637. doi: 10.1021/jacs.5b11413. - DOI - PubMed
    1. Zhang W. Wu W. Guo F. Dong X. W. J. Colloid Interface Sci. 2023;640:1068–1079. doi: 10.1016/j.jcis.2023.03.006. - DOI - PubMed
    1. Song Y. J. Wang H. Wang Z. T. Guo B. B. Jing K. G. Li Y. J. Wu L. ACS Catal. 2018;8:9656–9664. doi: 10.1021/acscatal.8b02662. - DOI