Co oxidation efficiency and hysteresis behavior over mesoporous pd/sio2 catalyst

Rola Mohammad Al Soubaihi, Khaled Mohammad Saoud, Myo Tay Zar Myint, Mats A. Göthelid, Joydeep Dutta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig . The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2 . Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

Original languageEnglish
Article number131
Pages (from-to)1-18
Number of pages18
JournalCatalysts
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 2021
Externally publishedYes

Keywords

  • CO oxidation
  • Hysteresis
  • Pretreatment
  • Structure-activity
  • Thermal stability

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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