Journal
CATALYSIS COMMUNICATIONS
Volume 10, Issue 9, Pages 1345-1349Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2009.02.019
Keywords
Potassium; NaY; Selectivity; Durability; Lactic acid; Dehydration
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Funding
- National Key Technology RD program [2006BAE02B04]
- hi-tech research and development program of China [2006AA020101]
- Sinopec Science and Technology RD Foundation [206003]
- Post-doctoral Science Fund of China [20070421004]
- Jiangsu Planned Projects for Post-doctoral Research Funds of China [0801018B]
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Potassium modification significantly improved the selectivity and durability of NaY zeolites during lactic acid dehydration reaction. The selectivity of 2.8K/NaY zeolites improved from 14.8% to 50.0% over NaY catalyst. Adding potassium also prolonged catalyst life. After 22 h the acrylic acid selectivity of NaY zeolites reduced to less than 10.0% while that of 3.5K/NaY retained 35.6%. Characterizations with NH3-TPD, CO2-TPD, N-2 adsorption and thermal analysis techniques revealed that the enhancement of catalytic performances could be attributed to the tuned acidity/basicity and the potassium electronic promoter effect. (C) 2009 Elsevier B. V. All rights reserved.
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