期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 505, 期 -, 页码 430-436出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.06.029
关键词
Cerium zirconium solid solutions (CZ); Halloysite (Hal); Hybrid materials; TWC performances
资金
- National Natural Science Fund of China [51304242, 51374250]
- Strategic Priority Research Program of Central South University [ZLXD2017005]
- National Science Fund for Distinguished Young Scholars [51225403]
- Natural Science Fund of Hunan Province [2017JJ3013]
- Innovation Driven Plan of Central South University [2016CX015]
- ShengHua Scholar Project of CSU [20160201]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130162120011]
- Hunan Provincial Co-Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources
- Funds for Hunan Provincial Natural Science Foundation for Innovative Research Groups [2]
- Foundation of Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province [HPK201501]
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N-2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H-2 reduction (H-2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition. The modified Hal hybridized cerium-zirconium solid solutions showed a rod-like morphology consisted of agglomerated nanoparticles with sizes of about 100 nm. The adaption of PEG-4000 has guided the formation of the nano-rods in the products. The Hal mineral in the composites retained their tubular morphology. The CZ-Hal composite showed larger BET surface area (130 m(2)/g compared to 71 m(2)/g), concentrated pore size distribution, as well as lower reduction temperature, compared with the pure CZ solid solutions. The supported Pd-Rh/CZ-Hal showed optimized catalytic performances for CO, NO (conversion up to 98%), and CnHn, (70%) at light-off temperatures. (C) 2017 Elsevier Inc. All rights reserved.
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