Effect of Ag loading on praseodymium doped ceria catalyst for soot oxidation activity

Pandurangappa Govardhan, Anjana Payyalore Anantharaman, Sunaina Shivasharanappa Patil, Hari Prasad Dasari, Harshini Dasari, Atmuri Shourya

Research output: Contribution to journalArticlepeer-review

Abstract

Silver-loaded praseodymium doped ceria (XAg/PDC) was synthesized by microwave-assisted co-precipitation and wetness impregnation. XRD confirms the fluorite structure of ceria without secondary phase, and Raman spectroscopy represents the increased generation of oxygen vacancies with Ag loading. The TEM analysis shows lattice fringes corresponding to both CeO2 and Ag on the surface. The BET and BJH analysis of catalyst confirms the high porosity accompanied by high surface area and pore diameter of 5Ag/PDC and 15Ag/PDC, making it more active for the oxidation reaction. From the XPS analysis the amount of surface Ce3+ concentration and the surface chemisorbed oxygen species (O22) is high for 5Ag/PDC and 15Ag/PDC, in line with XRD and Raman results. The soot oxidation T50 temperature follows the trend: 5Ag/PDC∼15Ag/PDC<10Ag/PDC<20Ag/PDC<0Ag/PDC. The Ag loading increased the surface reducibility of cerium ions and thus 5 wt% was optimized.

Original languageEnglish
Pages (from-to)328-342
Number of pages15
JournalKorean Journal of Chemical Engineering
Volume39
Issue number2
DOIs
Publication statusPublished - 02-2022

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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