Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 366, Issue -, Pages 54-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.11.083
Keywords
Macroporous CZ solid solution; Textual property; Reduction performance; Oxygen storage capacity
Categories
Funding
- National Natural Science Fund of China [51774331, 51304242]
- US Department of Energy, Office of Basic Energy Sciences, Division of Chemical, Biological and Geological Sciences [DE-FG02-86ER13622]
- National Science Fund for Distinguished Young Scholars [51225403]
- Natural Science Fund of Hunan Province [2017JJ0351]
- Innovation Driven Plan of Central South University [2016CX015]
- ShengHua Scholar Project of CSU [20160201]
- Strategic Priority Research Program of Central South University [ZLXD2017005]
- Hunan International Scientific and Technological Cooperation Base of Mineral Materials [2018WK4023]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130162120011]
- Funds for Hunan Provincial Natural Science Foundation for Innovative Research Groups [[2013]2]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts436, 2017zzts668, 2017zzts583]
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Macroporous CeO2-ZrO2 (CZ) solid solutions with gradually changing ceria content were prepared through the EISA method. Pore sizes of the samples are about 100 nm(-1) mu m and pore walls are 100 nm-1.5 mu m. The surface and near surface reduction bands of Ce4+ below 600 degrees C were maximized for the Ce0.5Zr0.5O2 sample (C5) according to the quantitative de-convolution to the acquired TPR curves. The area percentage of the O(2-)2p(6)-> Ce3+ 3d(9)4f(2) electronic transition band on XPS spectra, which related to the concentration of the Ce3+, was found to be a function of the ceria content. The oxygen storage capacity showed a positive relationship with the chemical compositions. Redox reactions below 600 degrees C play a key role in determining the reduction performances of ceria based TWC5. Three-way catalytic performances of the Pd + Rh + Pt /C5 sample showed an ignition temperature for CO and NOx at about 240 degrees C, and finished before 300 degrees C. The ignition of C3H8 started at 270 degrees C while finished at differed samples. The maximum catalytic efficiencies of CO, NOx, and C3H8 on C5 sample were revealed to 100%, 98%, and 97%, respectively. The performances showed that porous CZ solid solutions are suitable for high performance catalytic applications.
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