Submitted on: 17 March 2003.
Revised on: 23 April 2003.
Accepted on: 08 May 2003.
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Submitted on: 20 July 2007.
Revised on: 10 November 2007.
Accepted on: 04 December 2007.
___________________Chinese Journal of Catalysis---ELSEVIER
Submitted on: 14 April 2004.
Revised on: 11 August 2004.
Accepted on: 22 September 2004.
___________________Chinese Journal of Catalysis---ELSEVIER
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Submitted on: 18 July 2000.
Revised on: 30 August 2000.
Accepted on: 14 September 2000.
___________________Chinese Journal of Catalysis---ELSEVIER