Chinese Journal of Catalysis ›› 2023, Vol. 48: 195-204.DOI: 10.1016/S1872-2067(23)64424-9
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Fengwei Zhanga,*,1(), Hefang Guoa,1, Mengmeng Liua, Yang Zhaod, Feng Hongb, Jingjing Lia, Zhengping Dongc,*(), Botao Qiaob,*()
Received:
2022-12-07
Accepted:
2023-03-01
Online:
2023-05-18
Published:
2023-04-20
Contact:
* E-mail: About author:
First author contact:1Contributed equally to this work.
Supported by:
Fengwei Zhang, Hefang Guo, Mengmeng Liu, Yang Zhao, Feng Hong, Jingjing Li, Zhengping Dong, Botao Qiao. Enhancing the chemoselective hydrogenation of nitroarenes: Designing a novel surface-strained carbon-based Pt nanocatalyst[J]. Chinese Journal of Catalysis, 2023, 48: 195-204.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64424-9
Fig. 1. TEM and HRTEM images of Pt/OCNTs (a,b) and Pt/CNTs-800H (c,d). (e) HAADF-STEM and the corresponding elemental mapping images. (f) SACTEM image of the Pt/CNTs-800H catalyst.
Fig. 2. XRD patterns (a) and XANES spectra (b) at the Pt K-edge of the Pt foil, Pt/C, and Pt/CNTs-800H. (c) Fourier-transform (FT) k3-weighted χ (k)-function of the EXAFS spectra for the Pt K-edge. Raman spectra (d) and N2 adsorption-desorption isotherms (e) of Pt-based catalysts prepared at different heat treatment temperatures. (f) In-situ DRIFT spectra of CO adsorption on Pt/OCNTs and Pt/CNTs-800H obtained at room temperature.
Fig. 3. HRTEM images (a-d) and high-resolution XPS analysis (e-h) in the Pt 4f region of the as-prepared Pt/CNTs-TH (from left to right: T = 200, 400, 600, and 800 °C, respectively).
Fig. 4. Reaction kinetics for the hydrogenation of the nitrobenzene and styrene mixture in the presence of Pt/CNTs-TH (T = 200 °C (a), 400 °C (b), 600 °C (c), and 800 °C (d)). Reaction conditions: 0.25 mmol styrene, 0.25 mmol nitrobenzene, 10 mg Pt-based catalyst, 40 °C, 0.1-0.3 MPa H2, and 5 mL EtOH.
Entry | Catalyst | P (MPa) | t (h) | Conv. b (%) | Sel. b (%) |
---|---|---|---|---|---|
1 | Pt/OCNTs | 0.1 | 1 | >99 | 12.1 |
2 | Pt/CNTs-200H | 0.1 | 1 | >99 | 27.3 |
3 | Pt/CNTs-400H | 0.1 | 1.5 | >99 | 55.7 |
4 | Pt/CNTs-600H | 0.1 | 4 | >99 | 60.8 |
5 | Pt/CNTs-800H | 0.3 | 8 | 91.4 | 89.2 |
6 c | Pt/CNTs-800H | 0.1 | 7 | 94.8 | 81.1 |
7 d | Pt/CNTs-800Ar | 0.3 | 24 | 76.5 | 69.5 |
8 | 5 wt% Pt/C | 0.1 | 0.5 | >99 | — |
9 | 5 wt% Pt/C-800H | 0.1 | 1 | >99 | 61.7 |
10 | Pt/rGO | 0.1 | 1 | >99 | 1.5 |
11 | Pt/rGO-800H | 0.3 | 12 | 97.3 | 68.2 |
Table 1 Selective hydrogenation of 4-nitrostyrene with different catalysts. a
Entry | Catalyst | P (MPa) | t (h) | Conv. b (%) | Sel. b (%) |
---|---|---|---|---|---|
1 | Pt/OCNTs | 0.1 | 1 | >99 | 12.1 |
2 | Pt/CNTs-200H | 0.1 | 1 | >99 | 27.3 |
3 | Pt/CNTs-400H | 0.1 | 1.5 | >99 | 55.7 |
4 | Pt/CNTs-600H | 0.1 | 4 | >99 | 60.8 |
5 | Pt/CNTs-800H | 0.3 | 8 | 91.4 | 89.2 |
6 c | Pt/CNTs-800H | 0.1 | 7 | 94.8 | 81.1 |
7 d | Pt/CNTs-800Ar | 0.3 | 24 | 76.5 | 69.5 |
8 | 5 wt% Pt/C | 0.1 | 0.5 | >99 | — |
9 | 5 wt% Pt/C-800H | 0.1 | 1 | >99 | 61.7 |
10 | Pt/rGO | 0.1 | 1 | >99 | 1.5 |
11 | Pt/rGO-800H | 0.3 | 12 | 97.3 | 68.2 |
Entry | Substrate | Product | Time (h) | Conv. (%)a | Sel. (%)b |
---|---|---|---|---|---|
1 | 8 | 97.1 | >99 | ||
2 | 6 | 98.2 | >99 | ||
3 c | 4 | >99 | >99 | ||
4 c | 4 | >99 | >99 | ||
5 | 3 | >99 | >99 | ||
6 | 6 | 96.3 | >99 | ||
7 | 8 | 92.5 | >99 | ||
8 | 12 | 91.0 | >99 | ||
9 | 12 | >99 | >99 | ||
10 c | 8 | 91.4 | 89.2 |
Table 2 Selective hydrogenation of a variety of nitroarenes with Pt/CNTs-800H. a
Entry | Substrate | Product | Time (h) | Conv. (%)a | Sel. (%)b |
---|---|---|---|---|---|
1 | 8 | 97.1 | >99 | ||
2 | 6 | 98.2 | >99 | ||
3 c | 4 | >99 | >99 | ||
4 c | 4 | >99 | >99 | ||
5 | 3 | >99 | >99 | ||
6 | 6 | 96.3 | >99 | ||
7 | 8 | 92.5 | >99 | ||
8 | 12 | 91.0 | >99 | ||
9 | 12 | >99 | >99 | ||
10 c | 8 | 91.4 | 89.2 |
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