Harshini, D. Lee, Dae Hyung Jeong, Jihoon Kim, Yongmin Nam, Suk Woo Ham, Hyung Chul Han, Jong Hee Lim, Tae-Hoon Yoon, Chang Won 2024-01-20T10:01:35Z 2024-01-20T10:01:35Z 2021-09-05 2014-04-27 0926-3373 https://pubs.kist.re.kr/handle/201004/126868 To develop efficient materials possessing high oxygen storage capacity (OSC) for a number of catalytic applications, ceria-hafnia based metal oxides, Ce0.65Hf0.25M0.1O2-delta, (CH-M, M =Tb, Sm, Nd, Pr, and La), were prepared by the EDTA-citrate method. The structural and textural properties of the assynthesized materials were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analyses, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and high resolution transmission electron microscopy (HRTEM). These analyses indicated that the doping of the rare earth elements could potentially induce enhanced OSC compared to the undoped CeO2-HfO2 solid solution, and particularly, the CH-Pr, CH-La, and CH-Tb materials were suggested to possess greater OSC than other CeO2-HfO2 based solid solutions. The redoxability and size of the dopants were proposed to play a pivotal role in enhancing the OSC of the as-prepared materials. Soot oxidation experiments were further performed to examine the relative OSC of the ceria-hafnia based solid solutions and revealed that soot oxidation activities increased in the order of CH-Pr > CH-La > CH-Tb > CH-Nd > CH-Sm > CH (undoped material). To elucidate the effect of these materials on suppressing carbon coking, Ni/CH and Ni/CH-Pr catalysts were synthesized by a solvothermal method and their catalytic activities towards steam reforming of methane with steam to carbon ratios of 1-2 at 700 degrees C were carried out. The Ni/CH-Pr catalyst exhibited superior activity and stability over Ni/CH for the steam reforming of methane, which likely resulted from the enhanced oxygen mobility of the CH-Pr support. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV SOLUTIONS STRUCTURAL CHARACTERISTICS CATALYTIC-ACTIVITY CERIA-TERBIA DOPED CERIA REDOX PROPERTIES MIXED OXIDES OXIDATION PR ELECTROLYTE CEXZR1-XO2 Enhanced oxygen storage capacity of Ce0.65Hf0.25M0.1O2-delta (M = rare earth elements): Applications to methane steam reforming with high coking resistance Article 10.1016/j.apcatb.2013.11.022 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.148, pp.415 - 423 APPLIED CATALYSIS B-ENVIRONMENTAL 148 415 423 scie scopus 000332431500045 2-s2.0-84889687242 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article SOLUTIONS STRUCTURAL CHARACTERISTICS CATALYTIC-ACTIVITY CERIA-TERBIA DOPED CERIA REDOX PROPERTIES MIXED OXIDES OXIDATION PR ELECTROLYTE CEXZR1-XO2 Ceria-Hafnia Oxygen storage capacity Rare earth element Steam reforming of methane Coking resistance