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Citation: KANG Shou-Fang, JIANG Zheng, HAO Zheng-Ping. Influence of Cu on NOx Storage Performance of Pt/Cu-Mg-Al-O Catalysts Derived from Hydrotalcites[J]. Acta Physico-Chimica Sinica, ;2005, 21(03): 278-282. doi: 10.3866/PKU.WHXB20050310 shu

Influence of Cu on NOx Storage Performance of Pt/Cu-Mg-Al-O Catalysts Derived from Hydrotalcites

1.
Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing　100085

Received Date: 23 July 2004
Available Online: 15 March 2005

A series of Cu-Mg-Al hydrotalcite compounds with M (II) :Al (III) molar ratio of 3 : 1 were prepared by co-precipitation method. Corresponding mixed oxides were obtained after calcination 500 ℃（wCuO(％)= 0, 5, 10, 20, denoted as w-CMAO, w=0, 5, 10, 20）. Pt/Cu-Mg-Al-O catalysts were prepared by impregnation with H2PtCl6 solution. XRD results showed that Cu was well dispersed in the catalysts and their precursors. NO_x storage performance was investigated using NO_x adsorption experiment at constant temperature, and decomposition of stored NO_x was also studied by TPD method. It was shown that although M content was decreased due to Cu addition, the activity of NO oxidation was improved, and NO_x storage performance was increased effectively. TPD results further showed that the decomposition temperature of nitrate formed on the catalysts can be reduced sharply when w=10％～20％ of CuO was added.
- Nitrogen oxide; Hydrotalcite; NO_x storage; Lean burn; Pt/Cu-Mg-Al-O
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