Citation: ZHANG Ye-long, LI Yuan-yuan, JIA Chen, HAN Yu-wang, HU Yi. Research on stop-effect on the catalytic dehydration of ethanol over HZSM-5[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(12): 1495-1501. shu

Research on stop-effect on the catalytic dehydration of ethanol over HZSM-5

ZHANG Ye-long ¹ ,
LI Yuan-yuan ¹ ,
JIA Chen ² ,
HAN Yu-wang ^1,, ,
HU Yi ³

1.
1. College of Science, Nanjing University of Technology, Nanjing 210009, China;

Corresponding author: HAN Yu-wang,
Received Date: 22 April 2013
Available Online: 5 June 2013
Fund Project:

The stop-effect phenomenon on the catalytic dehydration of ethanol over HZSM-5 zeolite was observed. That is, when stopping ethanol-water feed for a period of time and restoring the feed, a dramatic increase on ethylene selectivity could be found. At different reaction conditions, it was found that the stop-effect was enhanced by increasing the stop time and reaction temperature or decreasing the feed speed. When the ethanol concentration was kept at 55%, the stop-effect could be strengthened and the high ethylene selectivity was maintained at long time. 500 h catalyst stability test showed that the stop-effect can improve the life span of the catalyst effectively. By studying the aqueous ethanol dehydration mechanism and experimental results, the preliminary conclusion is that causes of the stop-effect on the catalytic dehydration of ethanol over HZSM-5 is the accumulation of ethoxy intermediate and regeneration of empty catalytic active sites in stop operation.
- ethanol dehydration,
- ethylene,
- HZSM-5 catalyst,
- stop-effect
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