Journal
ACS OMEGA
Volume 2, Issue 8, Pages 4287-4296Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.7b00680
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Funding
- Ministry of Science and Technology of Taiwan [MOST 104-2221-E-155-049]
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Catalysts prepared for ethanol dehydration in a fixed-bed reactor acted as strong active acidic catalysts under reaction conditions at lower temperatures. Experimental conditions including the catalyst type [active aluminum oxide (gamma-Al2O3) and ZSM-5 zeolite catalyst modified using two-stage through dealumination or desilication and by using the impregnation method with phosphorous and lanthanum], weight hourly space velocity (WHSV), ethanol concentration, and reaction temperature were investigated to obtain optimal reaction conditions. The catalysts were characterized using the BrunauerEmmett-Teller method, temperature-programmed desorption of ammonia gas, thermogravimetric analysis, X-ray photoelectron spectroscopy, and X-ray diffraction. The results revealed that the ethylene yield and selectivity were 98.5 and 100%, respectively, for the ZSM-5 zeolite catalyst modified through dealumination at a temperature of 220 degrees C and WHSV of 2.5 h(-1) when the ethanol concentration was 95%. The ethylene yield and selectivity were 94.3 and 94.4%, respectively, for the ZSM-5 zeolite catalyst modified using phosphorous at a temperature of 240 degrees C and WHSV of 1.5 h(-1) when the ethanol concentration was 20%. Both of these catalysts were the most favorable among all prepared catalysts.
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