Ceria-samarium binary metal oxides: A comparative approach towards structural properties and soot oxidation activity

Anjana, P A and Geethu, J and Mohammed Rishab, P and Dasaria, Hari Prasad and Jong-Ho, Leeb and Dasari, Harshini and Uday Bhaskar Babud, G (2018) Ceria-samarium binary metal oxides: A comparative approach towards structural properties and soot oxidation activity. Molecular Catalysis, 451 (01). pp. 247-254. ISSN 2468-8231

[img] PDF
4550.pdf - Published Version
Restricted to Registered users only

Download (1MB) | Request a copy

Abstract

Binary metal oxides of CeO2-Sm2O3 (CSx, x varies from 10 to 90 mol%) along with pure CeO2 and Sm2O3 were synthesised successfully by the EDTA-Citrate method. From XRD, Raman spectroscopy and UV–vis DRS results, the whole composition of metal oxides exist in three phases: (fluorite phase (F) (CS10-CS30), bi-phase (fluorite (F)+cubic (C)) (CS30-CS90) and cubic phase (C) (Sm2O3)). For CSx samples, the calculated band gap energy values obtained from the UV–vis DRS results were in between 3.0–5.1 eV and fluorite phase samples (CS10–CS30) displayed lower band gap energy values (3.04–3.07 eV) than compared to the samples in other phases. Similarly, from XPS analysis, fluorite phase samples (CS10–CS30) showed higher surface oxygen vacancy concentration than compared to samples in other phases. Catalytic activity for soot oxidation is carried out on CSx samples, and the T50 temperature is in between 480–540 °C. Fluorite phase samples (CS10 CS30) showed higher surface area, lower degree of agglomeration, lower band gap energy, higher oxygen vacancy concentration and better catalytic activity for soot oxidation. Among all the CSx samples, CS10 sample displayed highest surface area (38m2/g), lowest degree of agglomeration (0.36), lowest band gap energy (3.04 eV), highest oxygen vacancy concentration (64%) and highest soot oxidation activity (T50=480 °C). The order of the soot oxidation activity of CSx samples followed the same trend of band gap energy values.

Item Type: Article
Uncontrolled Keywords: Ceria-samarium Solid solution Bi-phase Band gap energy Fluorite structure Soot oxidation
Subjects: Engineering > MIT Manipal > Chemical
Depositing User: MIT Library
Date Deposited: 02 Jul 2018 06:16
Last Modified: 02 Jul 2018 06:16
URI: http://eprints.manipal.edu/id/eprint/151450

Actions (login required)

View Item View Item