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Title: Studies of Ti0.5Zr0.5O2 supported CuO catalysts for NO + CO reaction
Authors: Ding, Guang-hui
Jiang, Xiao-yuan
Wang, Yue-juan
Zheng, Xiao-ming
Issue Date: Sep-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 B01J 21/06
Abstract: The activities of CuO supported on Ti0.5Zr0.5O2 have been examined with a microreactor-GC NO+CO reaction system and the catalysts characterized by BET, TPR, TG-DTA, XRO and NO-TPD. Experimental results show that the CuO/ Ti0.5Zr0.5O2 activities increase with increase in CuO loading. To obtain 99% NO conversion, the reaction temperature needed to be 350°C in air but on ly 200°C in H2 atmosphere. TPR analysis shows two peaks (α and β peaks) at CuO loading of ≤ 12%, while a third peak (γ peak) occurs with higher CuO loading at 300°C. The α peak is attributed to highly dispersed CuO, the β peak to isolated CuO and the γ peak to crystal CuO. TG-OTA also shows endothermic peak at low temperature (120°C) and exothermic peak at high temperature (725°C), indicating the completion of ZrTiO4 crystallization. From the XRD analysis, it has been found that there is no CuO crystal diffraction peaks at 12% CuO loadi ng, but two CuO crystal diffraction peaks at 2035.5° and 38.7° are present at 18% CuO loading. With increase in CuO loading, the intensity of CuO diffraction peaks is increased. In addition , NO-TPD analysis shows that NO adsorption and desorption by Ti0.5Zr0.5O2 in air are similar to those in H2 atmosphere. In air atmosphere, both CuO/ Ti0.5Zr0.5O2 and Ti0.5Zr0.5O2  have two adsorption peaks, but the former has lower desorption peak temperature than the latter, suggesting that the activity of NO decomposition by CuO/ Ti0.5Zr0.5O2 is higher than that by Ti0.5Zr0.5O2. In H2 atmosphere, the high temperature desorption peak disappears and there only exists one low temperature desorption peak at 150°C, inferring that the high temperature adsorption site is probably Cu2+ and the low temperature adsorption site is CUo.
Page(s): 1838-1845
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(09) [September 2004]

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