Citation:
CUI Ya-Juan, FANG Rui-Mei, SHANG Hong-Yan, SHI Zhong-Hua, GONG Mao-Chu, CHEN Yao-Qiang. Effect of Support Materials on Property and Catalytic Performance of Pd-Only Three-Way Catalyst[J]. Chinese Journal of Inorganic Chemistry,
;2015, (5): 989-1002.
doi:
10.11862/CJIC.2015.120
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Four kinds of support materials, i.e. a thermally stable material La2O3-Al2O3(LA), three oxygen storage materials CeO2-ZrO2-La2O3-Al2O3(CZLA), CeO2-ZrO2-La2O3+La2O3-Al2O3(CZL+LA) and CeO2-ZrO2-La2O3(CZL) with ceria content of 15%, 33% and 47%, respectively, were prepared by co-precipitation. The corresponding Pd-only catalysts Pd/LA, Pd/CZLA, Pd/CZL+LA and Pd/CZL were obtained by wet-impregnation and further fabricated as three-way catalysts in a monolith form. The support materials were characterized by low temperature nitrogen adsorption-desorption and H2-temperature programmed reduction (H2-TPR). The catalysts were characterized by H2-TPR and XPS, and were evaluated with a simulated automobile exhaust in terms of the relationships of three way performance with the air/fuel operation window and with temperatures. The results indicate that the support material CZLA integrates the advantages of ceria-based and alumina-based materials effectively thus having superior textural property, thermal stability and reduction property. Additionally, Pd/CZLA catalyst shows little difference in low temperature reducibility, surface elemental distribution and elemental oxidation states before and after aging treatment. As a result, Pd/CZLA exhibits the widest air/fuel operation window and the lowest light-off temperature among the four catalysts, especially after aging treatment, the light-off temperature of C3H8, NOx and CO is 370 ℃, 257 ℃, 223 ℃, respectively. Then material CZLA is the most suitable support for Pd-only three-way catalyst compared with the other three supports.
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