Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (5): 824-834.DOI: 10.1016/S1872-2067(20)63697-X
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Weiyin Wanga,b, Lu Linb, Haifeng Qib,c, Wenxiu Caod, Zhi Lie, Shaohua Chenf, Xiaoxuan Zoua,#(), Tiehong Chenf, Nanfang Tangb, Weiyu Songe, Aiqin Wangb,g, Wenhao Luob,*()
Received:
2020-05-08
Accepted:
2020-05-08
Online:
2021-05-18
Published:
2021-01-29
Contact:
Xiaoxuan Zou,Wenhao Luo
About author:
# E-mail: zouxiaoxuan@xtu.edu.cn† Contributed equally to this work.
Supported by:
Weiyin Wang, Lu Lin, Haifeng Qi, Wenxiu Cao, Zhi Li, Shaohua Chen, Xiaoxuan Zou, Tiehong Chen, Nanfang Tang, Weiyu Song, Aiqin Wang, Wenhao Luo. MIL-53 (Al) derived single-atom Rh catalyst for the selective hydrogenation of m-chloronitrobenzene into m-chloroaniline[J]. Chinese Journal of Catalysis, 2021, 42(5): 824-834.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63697-X
Catalysts | BET surface area (m2·g-1) | Micropore surface area a (m2·g-1) | External surface area a (m2·g-1) | Micropore volume a (cm3·g-1) | Rh loading (wt%) |
---|---|---|---|---|---|
MIL-53 (Al) | 1451 | 1001 | 450 | 0.498 | — |
Rh@MIL-53 (Al) | 1109 | 770 | 338 | 0.402 | — |
Rh@Al2O3@C | 219 | 78 | 141 | 0.040 | 0.1 d |
Rh@Al2O3@C (spent) b | 180 | 58 | 122 | 0.031 | 0.1 d |
Rh/γ-Al2O3 | 174 | — c | 178 | — c | 0.1 d |
Rh/C | 1472 | 598 | 875 | 0.309 | 0.1 d |
Table 1 Physicochemical properties of different samples under study.
Catalysts | BET surface area (m2·g-1) | Micropore surface area a (m2·g-1) | External surface area a (m2·g-1) | Micropore volume a (cm3·g-1) | Rh loading (wt%) |
---|---|---|---|---|---|
MIL-53 (Al) | 1451 | 1001 | 450 | 0.498 | — |
Rh@MIL-53 (Al) | 1109 | 770 | 338 | 0.402 | — |
Rh@Al2O3@C | 219 | 78 | 141 | 0.040 | 0.1 d |
Rh@Al2O3@C (spent) b | 180 | 58 | 122 | 0.031 | 0.1 d |
Rh/γ-Al2O3 | 174 | — c | 178 | — c | 0.1 d |
Rh/C | 1472 | 598 | 875 | 0.309 | 0.1 d |
Fig. 6. (a) The migration energetic diagram of single Rh atoms on the γ-Al2O3(100) surface; (b) nucleation energies Enuc of the aggregation from Rh1 to Rh4 on the γ-Al2O3(100) surface. Red, pink and dark cyan balls represent O, Al, and Rh atoms, respectively.
Fig. 7. Time profiles of selective hydrogenation of m-chloronitrobenzene using the Rh@Al2O3@C (a), the Rh/γ-Al2O3 (b) and the Rh/C (c) as the catalysts; (d) catalytic routes of selective hydrogenation of m-chloronitrobenzene to m-chloroaniline. Reaction conditions: T = 313 K, PH2 = 20 bar, 30 mg catalyst, 0.5 mmol m-chloronitrobenzene, 2 mL toluene.
Fig. 9. (a) The recycling experiments of the Rh@Al2O3@C; (b-d) STEM images of the spent Rh@Al2O3@C after five consecutive runs. Reaction conditions: T = 313 K, PH2 = 20 bar, t = 12 h, 30 mg catalyst, 0.5 mmol m-chloronitrobenzene, 2 mL toluene.
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