Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (7): 1185-1194.DOI: 10.1016/S1872-2067(20)63747-0
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Fangjun Shaoa,†, Zihao Yaoa,†, Yijing Gaoa, Qiang Zhoua, Zhikang Baoa, Guilin Zhuanga, Xing Zhonga, Chuan Wub, Zhongzhe Weia,*(), Jianguo Wanga,#()
Received:
2020-10-05
Accepted:
2020-11-29
Online:
2021-07-18
Published:
2020-12-10
Contact:
Zhongzhe Wei,Jianguo Wang
About author:
# Tel: +86-571-88871037; E-mail: jgw@zjut.edu.cn†These authors contributed equally to this work.
Supported by:
Fangjun Shao, Zihao Yao, Yijing Gao, Qiang Zhou, Zhikang Bao, Guilin Zhuang, Xing Zhong, Chuan Wu, Zhongzhe Wei, Jianguo Wang. Geometric and electronic effects on the performance of a bifunctional Ru2P catalyst in the hydrogenation and acceptorless dehydrogenation of N-heteroarenes[J]. Chinese Journal of Catalysis, 2021, 42(7): 1185-1194.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63747-0
Fig. 1. (a) TEM image, inset shows the size distribution histogram; (b) HRTEM image; (c) Corresponding EDS elemental (C, P, and Ru) mapping, and (d) Elemental line profile of Ru and P.
Entry | Catalyst | Hydrogenation a | Dehydrogenation b | |||||
Conversion (%) | Selectivity c (%) | TOF d (h‒1) | Conversion (%) | Selectivity e (%) | TOF f (h-1) | |||
1 | Ru2P/AC | 98.7 | >99.9 | 164.4 | 98.0 | >99.9 | 22.5 | |
2 | AC | 0.0 | 0.0 | — | 0.0 | 0.0 | — | |
3 | P_AC | 0.0 | 0.0 | — | 62.9 | >99.9 | — | |
4 | P/AC | 0.0 | 0.0 | — | 0.0 | 0.0 | — | |
5 | Ru/AC | 65.7 | 98.9 | 47.3 | 47.9 | 99.2 | 2.2 | |
6 | Ru/P_AC | 5.9 | 98.1 | 3.64 | 61.4 | 99.3 | 2.8 | |
7 | RuO2/AC | 0.0 | 0.0 | — | 99.2 | >99.9 | 4.6 | |
8 | RuS2/AC | 32.6 | 99.6 | 19.8 | 99.7 | 94.6 | 4.5 |
Table 1 Reversible transformation between 1a and 2a via hydrogenation-acceptorless dehydrogenation reactions catalyzed by a variety of catalysts.
Entry | Catalyst | Hydrogenation a | Dehydrogenation b | |||||
Conversion (%) | Selectivity c (%) | TOF d (h‒1) | Conversion (%) | Selectivity e (%) | TOF f (h-1) | |||
1 | Ru2P/AC | 98.7 | >99.9 | 164.4 | 98.0 | >99.9 | 22.5 | |
2 | AC | 0.0 | 0.0 | — | 0.0 | 0.0 | — | |
3 | P_AC | 0.0 | 0.0 | — | 62.9 | >99.9 | — | |
4 | P/AC | 0.0 | 0.0 | — | 0.0 | 0.0 | — | |
5 | Ru/AC | 65.7 | 98.9 | 47.3 | 47.9 | 99.2 | 2.2 | |
6 | Ru/P_AC | 5.9 | 98.1 | 3.64 | 61.4 | 99.3 | 2.8 | |
7 | RuO2/AC | 0.0 | 0.0 | — | 99.2 | >99.9 | 4.6 | |
8 | RuS2/AC | 32.6 | 99.6 | 19.8 | 99.7 | 94.6 | 4.5 |
Fig. 3. (a?d) Charge density difference of the product of hydrogenation (2a) on Ru(101), RuS2(200), RuO2(110), and Ru2P(112), respectively, and (e?h) Charge density difference of the product of dehydrogenation (1a) on Ru(101), RuS2(200), RuO2(110), and Ru2P(112), respectively.
Fig. 4. (a) 2-D activity heat map displaying the hydrogenation reaction conversion rate of various catalysts as a function of the desorption energy and rate-determining step barrier of 2a. Hydrogenation conditions: 0.5 mmol quinoline, 15 mg Ru2P/AC catalyst, H2 (5 bar), EtOH 2 mL at 60 °C for 2 h. (b) 2-D activity heat map displaying the dehydrogenation reaction conversion rate of various catalysts as a function of the rate-determining step barrier and desorption energy of 1a. Dehydrogenation conditions: 0.25 mmol tetrahydroquinoline, 20 mg Ru2P/AC catalyst, N2 (1 bar), 3 mL mesitylene at 145 °C for 10 h.
Fig. 5. (a) Energy profiles of C9H7N hydrogenation; (b) Energy profiles of C9H11N dehydrogenation in the presence of Ru2P (112), Ru (101), RuS2 (200), and RuO2 (110).
Fig. 6. Reusability test of the catalyst: (a) reusability test for the hydrogenation by the Ru2P/AC catalyst over 8 cycles at 60 °C for 5 h under H2 (5 bar); (b) reusability test for the hydrogenation by comparative catalysts over 5 cycles: Ru/AC was used at 80 °C for 5 h under H2 (10 bar), while RuS2/AC was used at 80 °C for 12 h under H2 (10 bar); (c) reusability test for the dehydrogenation by the Ru2P/AC catalyst over 8 cycles at 145 °C for 24 h under N2 (1 bar); (d) reusability test for the dehydrogenation by the Ru/AC and RuS2/AC catalysts over 5 cycles at 145 °C for 24 h under N2 (1 bar).
Entry | Substrate (A) | Substrate (B) a | Hydrogenation b | Dehydrogenation c | |||
Conversion (%) | Selectivity d (%) | Conversion (%) | Selectivity e (%) | ||||
1 | 98.7 | >99.9 | 98.0 | >99.9 | |||
2 | 99.1 | >99.9 | 99.9 | 92.5 | |||
3 | 99.5 | >99.9 | 99.9 | 86.8 | |||
4 | 99.4 | >99.9 | 99.9 | 93.4 | |||
5 | 98.9f | >99.9 | 99.9 | 95.8 | |||
6 | 99.2 | >99.9 | 99.9 | 98.0 | |||
7 | 99.6 | >99.9 | 99.9 | 89.9 | |||
8 | 99.2 | >99.9 | 99.9 | 87.6 | |||
9 | 99.5g | >99.9 | 99.0 | 89.4 |
Table 2 Ru2P/AC catalyzed hydrogenation and dehydrogenation of various quinolines.
Entry | Substrate (A) | Substrate (B) a | Hydrogenation b | Dehydrogenation c | |||
Conversion (%) | Selectivity d (%) | Conversion (%) | Selectivity e (%) | ||||
1 | 98.7 | >99.9 | 98.0 | >99.9 | |||
2 | 99.1 | >99.9 | 99.9 | 92.5 | |||
3 | 99.5 | >99.9 | 99.9 | 86.8 | |||
4 | 99.4 | >99.9 | 99.9 | 93.4 | |||
5 | 98.9f | >99.9 | 99.9 | 95.8 | |||
6 | 99.2 | >99.9 | 99.9 | 98.0 | |||
7 | 99.6 | >99.9 | 99.9 | 89.9 | |||
8 | 99.2 | >99.9 | 99.9 | 87.6 | |||
9 | 99.5g | >99.9 | 99.0 | 89.4 |
Entry | H2 pressure (bar) | Time (h) | Conversion (%) | Selectivity b (%) | |
4a | 5a | ||||
1 | — | 12 | 0 | — | — |
2 | 5 | 5 | 12.4 | 6.5 | 3.7 |
3 | 10 | 5 | 16.3 | 9.1 | 6.1 |
4 | 10 | 10 | 16.7 | 16.4 | |
5 | N2 | 12 | 0 | — | — |
Table 3 Hydrogenation of quinoxaline: molecular coupling experiments a.
Entry | H2 pressure (bar) | Time (h) | Conversion (%) | Selectivity b (%) | |
4a | 5a | ||||
1 | — | 12 | 0 | — | — |
2 | 5 | 5 | 12.4 | 6.5 | 3.7 |
3 | 10 | 5 | 16.3 | 9.1 | 6.1 |
4 | 10 | 10 | 16.7 | 16.4 | |
5 | N2 | 12 | 0 | — | — |
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