Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (3): 793-801.DOI: 10.1016/S1872-2067(21)63878-0
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Zhenyu Lia,†, Liyuan Huaia,†, Panpan Haoa,*(), Xi Zhaoa, Yongzhao Wangb, Bingsen Zhangb, Chunlin Chena, Jian Zhanga,#(
)
Received:
2021-04-07
Revised:
2021-04-07
Online:
2022-03-18
Published:
2022-02-18
Contact:
Panpan Hao, Jian Zhang
About author:
First author contact:† These authors contributed equally.
Supported by:
Zhenyu Li, Liyuan Huai, Panpan Hao, Xi Zhao, Yongzhao Wang, Bingsen Zhang, Chunlin Chen, Jian Zhang. Oxidation of 2,5-bis(hydroxymethyl)furan to 2,5-furandicarboxylic acid catalyzed by carbon nanotube-supported Pd catalysts[J]. Chinese Journal of Catalysis, 2022, 43(3): 793-801.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63878-0
Fig. 1. The time courses of normalized substrate concentrations. Reaction condition: No catalysts, substrate 20 mM, H2O 30 mL, NaOH/substrate (molar ratio) 10/1, 60 °C, 60 min.
Fig. 2. Effects of the pretreatment of CNTs on catalytic behaviors of the Pd/CNT catalysts for BHMF oxidation. Notably, the Pd/CNT sample with CNTs pretreated by 30 wt% HNO3 is specified as Pd/o-CNT in the main text. Reaction conditions: BHMF 20 mM, BHMF/Pd (molar ratio) 50/1, H2O 30 mL, NaOH/BHMF (molar ratio) 10/1, 60 °C, 100 ml/min O2, 60 min.
Entry | Catalyst | Pd loading b (wt %) | Mean particle size c (nm) | S(PdHx)/S(Pd0) d | ID/IG ratio e | BHMF conv. (%) | Yield (%) | |||
---|---|---|---|---|---|---|---|---|---|---|
FDCA | HMFCA | FFCA | HMF | |||||||
1 | Pd/CNT | 4.7 | 4.0 | 2.0 | 1.22 | >99 | 71.0 | 13.2 | 12.0 | 0.2 |
2 | Pd/o-CNT | 4.8 | 4.2 | 4.4 | 1.22 | >99 | 93.0 | 4.8 | 0 | 0 |
3 | Pd/o-CNT-10runs | 4.1 | 6.7 | 3.2 | — | >99 | 75.1 | 24.4 | 0 | 0 |
Table 1 Physicochemical properties and catalytic performances of carbon nanotube-supported Pd catalysts for BHMF oxidation. a
Entry | Catalyst | Pd loading b (wt %) | Mean particle size c (nm) | S(PdHx)/S(Pd0) d | ID/IG ratio e | BHMF conv. (%) | Yield (%) | |||
---|---|---|---|---|---|---|---|---|---|---|
FDCA | HMFCA | FFCA | HMF | |||||||
1 | Pd/CNT | 4.7 | 4.0 | 2.0 | 1.22 | >99 | 71.0 | 13.2 | 12.0 | 0.2 |
2 | Pd/o-CNT | 4.8 | 4.2 | 4.4 | 1.22 | >99 | 93.0 | 4.8 | 0 | 0 |
3 | Pd/o-CNT-10runs | 4.1 | 6.7 | 3.2 | — | >99 | 75.1 | 24.4 | 0 | 0 |
Fig. 5. (a) Stability of the Pd/o-CNT catalyst during the recycling uses for BHMF oxidation. Reaction conditions: BHMF 20 mM, BHMF/Pd (molar ratio) 50/1, H2O 30 mL, NaOH/BHMF (molar ratio) 10/1, 60 °C, 100 ml/min O2, 60 min. TEM image (b), XRD pattern (c) and XPS Pd 3d spectra (d) for the spent Pd/o-CNT-10runs catalyst.
Fig. 6. The time courses for the oxidation of BHMF (a) and HMF (b) over Pd/o-CNT under a NaOH/substrate molar ratio of 10:1. Effect of the base concentration on catalytic behavior of the Pd/o-CNT catalyst for the oxidation of BHMF (c) and HMF (d). Reaction conditions: substrate 20 mM, substrate/Pd (molar ratio) 50/1, H2O 30 mL, 60 °C, 100 ml/min O2, 60 min.
Fig. 7. (a) The proposed reaction pathway for BHMF oxidation over the Pd/o-CNT catalyst. The time courses for the oxidation of DFF (b) and FFCA (c) over Pd/o-CNT. Reaction conditions: substrate 20 mM, substrate/Pd (molar ratio) 50/1, H2O 30 mL, 60 °C, 100 ml/min O2, 60 min.
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