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Submitted on: 29 September 2008.
Revised on: 16 December 2008.
Accepted on: 09 February 2009.
___________________APPLIED CATALYSIS A-GENERAL---ELSEVIER
Submitted on: 19 December 2011.
Revised on: 29 January 2012.
Accepted on: 15 February 2012.
___________________APPLIED CATALYSIS A-GENERAL---ELSEVIER
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Submitted on: 05 November 2009.
Revised on: 02 March 2010.
Accepted on: 01 April 2010.
___________________APPLIED CATALYSIS A-GENERAL---ELSEVIER
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