TY - JOUR
T1 - Insights of MOF-derived bimetallic PVP/Ce-Ru nanocomposites for diesel soot oxidation
AU - Rajagopal, Nithya
AU - Uppara, Hari Prasad
AU - Dasari, Harshini
AU - Palla, Venkata Chandra Sekhar
AU - Yenumala, Sudhakara Reddy
N1 - Funding Information:
The authors thank MIT, MAHE for proving Intramural Fund and also thank MRC, MNIT, Jaipur for carrying out Raman spectroscopic analysis.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/9
Y1 - 2023/9
N2 - Novel MOF derived Ce-Ru mixed metal oxides were synthesized with addition of different amounts of PVP substance and investigated its catalytic effect towards the oxidation of diesel soot particles. These nano materials were characterized by XRD, BET Surface area, FESEM/EDS, HRTEM, Raman, UV–vis-DRS, XPS, H2-TPR and soot-TPR analysis. The structural characterization of CeO2@MOF reveals the formation of cubic crystalline phase; however, structural distortions were observed after attempting to incorporate Ru4+ cation into the crystal lattice. Besides, the samples' structural and surface characteristics were strongly influenced by the addition of PVP polymeric substance. FESEM images reveal the formation of nano-bar shaped particles with cracks and fissures on the surface of the as-synthesized samples. Indeed, the average particle diameters obtained from HRTEM analysis were in the range of 5 to 9 nm, signifying there was a reduction of particle sizes after addition of PVP substance. The spectra of Raman analysis evidenced the formation of oxygen vacancies for RuO2/PVP added samples, leading to a generation of active oxygen species (O2x-) that can be utilized during the oxidation reactions. The presence of Ce3+/Ce4+, Ru4+/Ru0 cations on the surface of oxides were noticed using XPS and H2-TPR analysis. In addition, O1s analysis attributes the higher mobility of surface chemisorbed oxygen species from the surface of the catalyst. Thus, Ce-Ru@MOF sample exhibited higher soot oxidation activity among the prepared samples with T50% and T90% were recorded as 336 °C and 387 °C respectively.
AB - Novel MOF derived Ce-Ru mixed metal oxides were synthesized with addition of different amounts of PVP substance and investigated its catalytic effect towards the oxidation of diesel soot particles. These nano materials were characterized by XRD, BET Surface area, FESEM/EDS, HRTEM, Raman, UV–vis-DRS, XPS, H2-TPR and soot-TPR analysis. The structural characterization of CeO2@MOF reveals the formation of cubic crystalline phase; however, structural distortions were observed after attempting to incorporate Ru4+ cation into the crystal lattice. Besides, the samples' structural and surface characteristics were strongly influenced by the addition of PVP polymeric substance. FESEM images reveal the formation of nano-bar shaped particles with cracks and fissures on the surface of the as-synthesized samples. Indeed, the average particle diameters obtained from HRTEM analysis were in the range of 5 to 9 nm, signifying there was a reduction of particle sizes after addition of PVP substance. The spectra of Raman analysis evidenced the formation of oxygen vacancies for RuO2/PVP added samples, leading to a generation of active oxygen species (O2x-) that can be utilized during the oxidation reactions. The presence of Ce3+/Ce4+, Ru4+/Ru0 cations on the surface of oxides were noticed using XPS and H2-TPR analysis. In addition, O1s analysis attributes the higher mobility of surface chemisorbed oxygen species from the surface of the catalyst. Thus, Ce-Ru@MOF sample exhibited higher soot oxidation activity among the prepared samples with T50% and T90% were recorded as 336 °C and 387 °C respectively.
UR - https://www.scopus.com/pages/publications/85166220786
UR - https://www.scopus.com/inward/citedby.url?scp=85166220786&partnerID=8YFLogxK
U2 - 10.1016/j.inoche.2023.111126
DO - 10.1016/j.inoche.2023.111126
M3 - Article
AN - SCOPUS:85166220786
SN - 1387-7003
VL - 155
JO - Inorganic Chemistry Communications
JF - Inorganic Chemistry Communications
M1 - 111126
ER -