Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (9): 1530-1537.DOI: 10.1016/S1872-2067(20)63763-9
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Feng Honga,b, Shengyang Wanga,c, Junying Zhanga, Junhong Fua, Qike Jianga, Keju Sund,#(), Jiahui Huanga,*(
)
Received:
2020-11-25
Accepted:
2021-01-15
Online:
2021-09-18
Published:
2021-05-16
Contact:
Keju Sun,Jiahui Huang
About author:
# E-mail: kjsun@ysu.edu.cnSupported by:
Feng Hong, Shengyang Wang, Junying Zhang, Junhong Fu, Qike Jiang, Keju Sun, Jiahui Huang. Strong metal-support interaction boosting the catalytic activity of Au/TiO2 in chemoselective hydrogenation[J]. Chinese Journal of Catalysis, 2021, 42(9): 1530-1537.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63763-9
Fig. 1. Conversion of 3-NS and selectivity of 3-VA versus time over Au/TiO2 catalysts calcined under different conditions. Gold catalysts were calcined at (a) 400 or (b) 500 °C. Reaction conditions: 3-NS (1.2 mmol); Au catalyst (6 × 10-3 mmol Au); H2 pressure (2 MPa); stirring rate: 1200 rpm, temperature: 60 °C.
Fig. 2. (a) TOF values of 3-NS hydrogenation over Au/TiO2-500H and Au/TiO2-500O. Conditions: 3-NS (1.2 mmol); Au catalyst (6 × 10-3 mmol Au). (b) Arrhenius plots for 3-NS chemoselective hydrogenation over Au/TiO2-500H and Au/TiO2-500O. Conversion of 3-NS is in the range 10%-20%. Reaction conditions: 3-NS (0.2 mmol); Au catalyst (1 × 10-3 mmol Au); H2 pressure (2 MPa); stirring rate: 1200 rpm; temperature: 40, 50, 60 and 70 °C.
Fig. 3. (a) 3-NS conversion versus time over Au/TiO2 catalyst calcined under different gaseous atmospheres; (b) EPR spectra of the gold catalysts calcined at 500 °C under different gases; HAADF-STEM images and EELS spectra of (c,d) Au/TiO2-500O and (e,f) Au/TiO2-500H.
Fig. 4. H2-D2 exchange reaction over Au/TiO2-500H (a) and Au/TiO2-500O (b). This reaction was performed in a fixed bed at a temperature range of 30-200 °C. Conditions: 30 mL·min of 50% H2 and 50% D2 (space velocity = 36000 mL·gcat-1·h-1); temperature range: 30-200 °C; pressure: 0.1 MPa. (c) The reaction paths for the H2-D2 exchange reaction on Au/TiO2-x (representing Au/TiO2-500H) and Au/TiO2 (on behalf of Au/TiO2-500O). (d) The energy changes of hydrogen transfer on Au/TiO2 and Au/TiO2-x. The red, blue, yellow, and pink balls represent oxygen, titanium, gold, and hydrogen or deuterium, respectively.
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