Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions

LEI Jiaqi; DUAN Xuezhi; QIAN Gang; ZHOU Xinggui

doi:10.11949/j.issn.0438-1157.20161026

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Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions

更新时间：2025-12-10

- Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions
- CIESC Journal Issue 2, Pages: 679-686(2017)
- 作者机构：
  
  化学工程联合国家重点实验室, 华东理工大学化工学院,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161026
  CLC： Q203.2
- Online First：05 February 2017，
  
  Published：05 February 2017
- 稿件说明：
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LEI Jiaqi, DUAN Xuezhi, QIAN Gang, et al. Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions[J]. CIESC Journal, 2017, (2): 679-686.
DOI：

LEI Jiaqi, DUAN Xuezhi, QIAN Gang, et al. Effects of carbon support on glycerol oxidation over Pt-C composite catalysts in base-free conditions[J]. CIESC Journal, 2017, (2): 679-686. DOI： 10.11949/j.issn.0438-1157.20161026.

摘要

采用等量浸渍法制备了具有相似平均粒径的活性炭（AC）和碳纳米管（CNTs）负载的Pt催化剂，并比较研究了非碱性条件下两种催化剂催化甘油氧化反应的性能。结果表明，炭载体对Pt-C复合物催化甘油氧化反应的活性、选择性和稳定性有重要影响。相对于Pt/CNTs催化剂，Pt/AC催化剂中Pt 4f结合能较低，导致其表面氧的覆盖度相对较高，因而抑制了甘油的吸附，降低了甘油氧化反应的初始活性；Pt/AC催化剂会促进甘油醛进一步氧化成甘油酸以及C3产物的氧化断键；Pt/AC催化剂失活的主要原因是氧中毒和中间产物的吸附，而Pt/CNTs催化剂的失活主要是由于甘油酸的吸附堵塞Pt表面的活性位造成的。

Abstract

Activated carbon (AC) and carbon nanotubes (CNTs) supported Pt catalysts with similar particle sizes prepared by incipient wetness impregnation method were used for study of base-free oxidation of glycerol. The results showed that carbon support of Pt-C composite catalysts had significant impact on reactivity

selectivity

and steady state of glycerol oxidation. Compared to Pt/CNTs catalyst

Pt/AC catalyst had a lower binding energy of Pt 4f leading to a higher oxygen coverage on catalyst surface which reduced glycerol adsorption and initial activity of glycerol oxidation. Pt/AC catalyst further favored oxidation of glyceraldehyde to glyceric acid and C-C bond cleavage of C3 products. With regards to catalyst deactivation

oxygen poison and adsorption of intermediates were main factors to Pt/AC catalyst while blockage of Pt active sites by adsorption of glyceric acid was a significant contributor to Pt/CNTs catalyst.

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