Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 278-282.doi: 10.3866/PKU.WHXB20050310

• ARTICLE • Previous Articles     Next Articles

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

KANG Shou-Fang; JIANG Zheng; HAO Zheng-Ping   

  1. Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085
  • Received:2004-07-23 Revised:2004-10-11 Published:2005-03-15
  • Contact: HAO Zheng-Ping

Abstract: 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. NOx storage performance was investigated using NOx adsorption experiment at constant temperature, and decomposition of stored NOx was also studied by TPD method. It was shown that although MgO content was decreased due to Cu addition, the activity of NO oxidation was improved, and NOx 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.

Key words: Nitrogen oxide, Hydrotalcite, NOx storage, Lean burn, Pt/Cu-Mg-Al-O