CRCU

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (5): 734-738.

• Articles • Previous Articles     Next Articles

Ag/Mg-Al-O Composite for Low Temperature NOx Storage

WANG Tian-you*, LU Zhen, YANG Sheng-hua and SUN Kai   

  1. State Key Laboratory of Engines, School of Mechanical Engeering, Tianjin University, Tianjin 300072, P. R. China
  • Received:2010-10-08 Revised:2011-06-04 Online:2011-09-25 Published:2011-09-06
  • Contact: WANG Tian-you E-mail:tianyou_wang@yahoo.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.50876074).

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Abstract: Ag/Mg-Al-O composite was prepared by the calcination of Ag-containing Mg-Al hydrotalcite-like compound and metallic Ag supported on periclase phase Mg-Al-O was obtained. The as-prepared Ag/Mg-Al-O composite exhibits good NOx storage capability in a relatively low temperature range of 150―300 °C. The highest NOx storage capability of 7.3 mg/g was achieved at 150 °C, while a lower NOx storage capability of 5.1 mg/g was achieved at 300 °C. Meanwhile, ca. 25% of NOx was observed to decompose to N2 at 300 °C. In situ FTIR results suggest that NOx mainly stored in Ag/Mg-Al-O catalyst in the form of bridging nitrites located on periclase phase Mg-Al-O.

Key words: Ag/Mg-Al-O, NOx storage, Decomposition, Bridging nitrite