Chinese Journal of Catalysis ›› 2024, Vol. 61: 259-268.DOI: 10.1016/S1872-2067(24)60048-3
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Xin Denga, Caiyan Zhengb, Weijie Lia, Jiamin Wanga, Di Yanga, Zhenpeng Hub, Landong Lia,c,*()
Received:
2024-02-22
Accepted:
2024-04-29
Online:
2024-06-18
Published:
2024-06-20
Contact:
* E-mail: Supported by:
Xin Deng, Caiyan Zheng, Weijie Li, Jiamin Wang, Di Yang, Zhenpeng Hu, Landong Li. Spontaneous dispersion of metallic nickel centers in inert metal substrate for the selective hydrogenation of carbon-carbon triple bonds[J]. Chinese Journal of Catalysis, 2024, 61: 259-268.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60048-3
Scheme 1. Structure model of Ni species supported on metal oxide (a) and metal substrate (b). Single-site metallic catalyst system employed in this study highlighted by red dot line.
Fig. 1. Characterization of Ni/Al system. (a) Ni 2p XPS of Ni/Al samples. (b) HS-LEIS spectra of Ni/Al sample at different etching depths with 4 He+. (c) AC-STEM images of Ni/Al sample. Scale bar = 1 nm.
Fig. 2. Catalytic performance of acetylene hydrogenation over Ni/Al catalysts. (a) Temperature-dependent behavior of Ni/Al catalysts in acetylene hydrogenation. (b) Arrhenius plot for acetylene hydrogenation over Ni/Al catalyst; Reaction conditions: 0.1 g catalyst, 1% C2H2, 20% H2, balanced with He, GHSV = 24000 mL g-1 h-1. (c) Stability test of Ni/Al catalyst at 420 K. Reaction condition: 0.1 g catalyst, 1% C2H2, 20% H2, balanced with He, GHSV = 24000 mL g-1 h-1. (d) Comparison of the acetylene semi-hydrogenation performance between Ni/Al catalyst and representative non-noble metal catalysts in the literature [14?-16,34???????-42].
Fig. 3. Reaction process of acetylene semi-hydrogenation over Ni/Al catalyst. (a) Temperature-programmed desorption profiles of H2, C2H2 and C2H4 over Ni/Al sample. (b) Primary isotope effect observed in acetylene semi-hydrogenation over Ni/Al catalyst. (c) Reaction orders of H2 and C2H2 in acetylene semi-hydrogenation over Ni/Al catalyst at 373, 393 and 413 K, respectively. (d) Pulse-response experiments of C2H2 feeding to Ni/Al catalyst in H2-D2 stream at 410 K. Reaction condition: 0.2 g catalyst, 10 mL min-1 H2, 10 mL min-1 D2, 50 mL min-1 N2, with two C2H2 pulse introduced intermittently.
Fig. 4. Calculated reaction pathways and energy profiles of acetylene hydrogenation over Ni/Al catalyst with the optimized structures shown inset. (a) Reaction between adsorbed hydrogen and adsorbed acetylene, (b) reaction between adsorbed hydrogen and gas-phase acetylene. Al, Ni, C and H atoms are shown in blue, crimson, grey and white, respectively. Energy barrier in the unit of eV shown in square brackets.
Entry | Substrate | Product | Conversion (%) | Selectivity (%) |
---|---|---|---|---|
1 | ![]() | ![]() | 100 | 96 |
2 | ![]() | ![]() | 100 | 91 |
3 | ![]() | ![]() | 100 | 89 |
4 | ![]() | ![]() | 100 | 82 |
5 | ![]() | ![]() | 100 | 83 |
6 | ![]() | ![]() | 100 | 85 |
7 | ![]() | ![]() | 100 | 90 |
8 | ![]() | ![]() | 100 | 93 |
9 | ![]() | ![]() | 100 | 81 |
10 | ![]() | ![]() | 100 | 92 |
11 | ![]() | ![]() | 100 | 97 |
12 | ![]() | ![]() | 100 | 95 |
Table 1 Liquid-phase semi-hydrogenation of alkynes/alkynols over Ni/Al catalyst a.
Entry | Substrate | Product | Conversion (%) | Selectivity (%) |
---|---|---|---|---|
1 | ![]() | ![]() | 100 | 96 |
2 | ![]() | ![]() | 100 | 91 |
3 | ![]() | ![]() | 100 | 89 |
4 | ![]() | ![]() | 100 | 82 |
5 | ![]() | ![]() | 100 | 83 |
6 | ![]() | ![]() | 100 | 85 |
7 | ![]() | ![]() | 100 | 90 |
8 | ![]() | ![]() | 100 | 93 |
9 | ![]() | ![]() | 100 | 81 |
10 | ![]() | ![]() | 100 | 92 |
11 | ![]() | ![]() | 100 | 97 |
12 | ![]() | ![]() | 100 | 95 |
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