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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

邮发代号 80-969

2019 Impact Factor: 3.552

Frontiers of Chemical Science and Engineering  2016, Vol. 10 Issue (3): 417-424   https://doi.org/10.1007/s11705-016-1583-1
  本期目录
 
 
 
Effect of thermal pretreatment on the surface structure of PtSn/SiO2 catalyst and its performance in acetic acid hydrogenation
Guozhen Xu,Jian Zhang(),Shengping Wang,Yujun Zhao(),Xinbin Ma
Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Centre of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Abstract

The effect of thermal pretreatment on the active sites and catalytic performances of PtSn/SiO2 catalyst in acetic acid (AcOH) hydrogenation was investigated in this article. The catalysts were characterized by N2 physical adsorption, X-ray diffraction, transmission electron microscopy, pyridine Fourier-transform infrared spectra, and H2-O2 titration on its physicochemical properties. The results showed that Pt species were formed primarily in crystalline structure and no PtSnx alloy was observed. Meanwhile, with the increment of thermal pretreatment temperature, Pt dispersion showed a decreasing trend due to the aggregation of Pt particles. Simultaneously, the amount of Lewis acid sites was remarkably influenced by such thermal pretreatment owning to the consequent physicochemical property variation of Sn species. Interestingly, the catalytic activity showed the similar variation trend with that of Lewis acid sites, confirming the important roles of Lewis acid sites in AcOH hydrogenation. Moreover, a balancing effect between exposed Pt and Lewis acid sites was obtained, resulting in the superior catalytic performance in AcOH hydrogenation.

Key wordsthermal pretreatment    acetic acid    hydrogenation    ethanol    PtSn/SiO2
收稿日期: 2016-04-19      出版日期: 2016-08-23
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Corresponding Author(s): Jian Zhang,Yujun Zhao   
 引用本文:   
.  [J]. Frontiers of Chemical Science and Engineering, 2016, 10(3): 417-424.
Guozhen Xu, Jian Zhang, Shengping Wang, Yujun Zhao, Xinbin Ma. Effect of thermal pretreatment on the surface structure of PtSn/SiO2 catalyst and its performance in acetic acid hydrogenation. Front. Chem. Sci. Eng., 2016, 10(3): 417-424.
 链接本文:  
https://academic.hep.com.cn/fcse/CN/10.1007/s11705-016-1583-1
https://academic.hep.com.cn/fcse/CN/Y2016/V10/I3/417
Catalysts loadinga) /wt-% SBET /(m2·g?1) Dpore /nm Vpore /(cm3·g?1) Db) /nm Pt dispersionc)/% Lewis acid sited) /(µmol·g?1)
Pt Sn
PtSn/SiO2-100 0.87 0.89 435 4.25 0.54 1.46 55.6 14.50
PtSn/SiO2-200 0.88 0.90 419 4.89 0.59 2.21 48.2 12.11
PtSn/SiO2-300 0.90 0.87 418 4.88 0.59 3.12 42.6 10.31
PtSn/SiO2-400 0.87 0.90 408 3.58 0.37 4.80 25.9 14.39
PtSn/SiO2-500 0.89 0.88 381 3.72 0.39 5.12 15.0 10.69
Tab.1  
Fig.1  
Fig.2  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
Catalysts Conv. /% Selectivity /%
EtOH AcOEt
PtSn/SiO2-100 94.9 89.1 10.0
PtSn/SiO2-200 80.7 86.4 13.0
PtSn/SiO2-300 45.6 75.5 22.9
PtSn/SiO2-400 53.9 83.4 15.9
PtSn/SiO2-500 36.5 84.7 14.0
Tab.2  
Fig.7  
Fig.8  
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