Chinese Journal of Catalysis ›› 2023, Vol. 50: 260-272.DOI: 10.1016/S1872-2067(23)64473-0
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Shiyao Liua,1, Yutong Gongb,1, Xiao Yangb, Nannan Zhanga, Huibin Liua, Changhai Lianga,*(), Xiao Chena,*()
Received:
2023-03-22
Accepted:
2023-06-05
Online:
2023-07-18
Published:
2023-07-25
Contact:
*E-mail: About author:
1 Contributed equally to this work.
Supported by:
Shiyao Liu, Yutong Gong, Xiao Yang, Nannan Zhang, Huibin Liu, Changhai Liang, Xiao Chen. Acid-durable intermetallic CaNi2Si2 catalyst with electron-rich Ni sites for aqueous phase hydrogenation of unsaturated organic anhydrides/acids[J]. Chinese Journal of Catalysis, 2023, 50: 260-272.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64473-0
Fig. 1. (a) Schematic showing synthetic steps for CaNi2Si2 NPs. (b) Crystal structure and powder XRD pattern of CaNi2Si2 sample with Rietveld analysis. (c) WF (?) calculated from the measurement of secondary electron cut-off using UPS at a bias voltage of 6 V. H2-TPR (d) and H2-TPD (e) profiles of CaNi2Si2, Ni2Si, and Ni/SBA-15 samples.
Fig. 3. (a) XPS spectra of Ni 2p, Ca 2p, Si 2p, and O 1s of CaNi2Si2 after Ar+ sputtering. (b) Bader charges of CaNi2Si2 and 3D electron density isosurface map in the region from -0.5 eV to EF at 0.0025 A-3. (c) Calculated electronic DOS of CaNi2Si2 (112)-Ni and Ni metal (111)-Ni. The dotted lines are the d-band centers of CaNi2Si2 (112)-Ni (-1.35 eV) and Ni metal (111)-Ni (-1.06 eV), respectively.
Fig. 4. (a) Reaction pathway for the hydrogenation of MAn in the aqueous phase. (b) Comparison of the catalytic performance of different catalysts (CaNi2Si2, Ni2Si, CaSi2, Ni/SBA-15, and SBA-15). Effect of reaction temperature (c) and H2 pressure (d) on the hydrogenation of MAn in the aqueous phase over CaNi2Si2 (2.0 wt% of MAn aqueous and 0.2 g catalyst). (e) Product distribution for the hydrogenation of MAn in the aqueous phase over CaNi2Si2 catalyst at 3 MPa and 120 °C.
Fig. 5. Kinetic equilibrium constant (a-d) and Arrhenius plot (e) for aqueous phase hydrogenation of MAn (The Ea was estimated in the range of 60-120 °C for controlling the conversion of MAc below 30%).
Fig. 6. Stability tests of the CaNi2Si2 (a) and Ni/SBA-15 (b) for the aqueous-phase hydrogenation of MAn (The inset images display the photos of products at different reaction times and the fresh and spent catalysts).
Entry | Substrate | Product | pH | Reaction condition | Contact time (gcat/(mmol·min-1)) | Conv. (%) | Sel. (%) | |
---|---|---|---|---|---|---|---|---|
T (°C) | P (MPa) | |||||||
1a | 2.52 | 100 | 1 | 14.4 | 100 | 100 | ||
2a | 2.64 | 120 | 3 | 2.1 | 100 | 99 | ||
3a | 2.33 | 120 | 3 | 4.5 | 100 | 99 | ||
4a | 1.81 | 120 | 3 | 8.4 | 92 | 100 | ||
5a | 2.04 | 240 | 3 | 4.5 | 98 | 95 | ||
6b | 1.95 | 120 | 3 | 5.0 h | 100 | 97 |
Table 1 Hydrogenation of other unsaturated organic acids/anhydrides over CaNi2Si2.
Entry | Substrate | Product | pH | Reaction condition | Contact time (gcat/(mmol·min-1)) | Conv. (%) | Sel. (%) | |
---|---|---|---|---|---|---|---|---|
T (°C) | P (MPa) | |||||||
1a | 2.52 | 100 | 1 | 14.4 | 100 | 100 | ||
2a | 2.64 | 120 | 3 | 2.1 | 100 | 99 | ||
3a | 2.33 | 120 | 3 | 4.5 | 100 | 99 | ||
4a | 1.81 | 120 | 3 | 8.4 | 92 | 100 | ||
5a | 2.04 | 240 | 3 | 4.5 | 98 | 95 | ||
6b | 1.95 | 120 | 3 | 5.0 h | 100 | 97 |
Fig. 7. TPD (a) and TPSR (b) profiles of acrylic acid over the CaNi2Si2 catalyst. (c) DRIFT spectra of acrylic acid desorbed on CaNi2Si2 under Ar flow at 30, 50, and 100 °C. (d) DRIFT spectra of acrylic acid over the CaNi2Si2 catalyst in 10 vol% H2/Ar.
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