Efficient Catalytic Oxidation of Ethylene at 0 °C on an in Situ Carbon Modified Pt Catalyst Supported on SBA-15

Qian Zhao, Yang Gu, Heyun Fu, Xiaolei Qu, Zhaoyi Xu, Benny Chefetz, Shourong Zheng*, Dongqiang Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The design of efficient catalysts for catalytic ethylene (C2H4) oxidation is of crucial importance for extending the shelf life of fruits and vegetables. Herein, a carbon modified SBA-15 supported Pt catalyst (Pt/CSBA-15) was prepared in situ by a facile solid phase grinding-infiltration-inert atmosphere calcination method. Characterization results reveal that in the Pt/CSBA-15 catalysts thin carbon layers are successfully formed in the hexagonal pores of SBA-15. Additionally, Pt particles are well dispersed in the channels of SBA-15, and Pt/CSBA-15 has a smaller Pt particle size than the catalyst without carbon modification (i.e., Pt/SBA-15). O2 is more feasibly adsorbed and activated on small-sized Pt particles, and in situ formed carbon species enhance the hydrophobicity of catalysts. As a result, both 3Pt/CSBA-15 and 5Pt/CSBA-15 are able to maintain 100% conversion of 50 ppm of C2H4 for more than 7 h at 0 °C. 3Pt/CSBA-15 even achieves 81.5% C2H4 conversion and 71.6% CO2 yield after 20 h, exhibiting much more prominent catalytic performances than 3Pt/SBA-15. DFT calculations and in situ FTIR measurements confirm that small-sized Pt particles possess strong O2 affinity to promote O2 adsorption, and in situ formed hydrophobic carbon layers efficiently suppress competitive H2O adsorption.

Original languageAmerican English
JournalEnvironmental Science and Technology
DOIs
StateAccepted/In press - 2023

Bibliographical note

Publisher Copyright:
© 2024 American Chemical Society.

Keywords

  • SBA-15 supported Pt catalyst
  • confinement effects
  • in situ carbon modification
  • low-temperature oxidation of ethylene
  • surface hydrophobicity

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