期刊
JOURNAL OF CLEANER PRODUCTION
卷 135, 期 -, 页码 368-378出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2016.06.110
关键词
Bio-ethanol; Dehydration; Hierarchical mesoporous; HZSM-5; Catalytic stability
资金
- Center of Excellence for Petrochemical and Materials Technology
- Petroleum and Petrochemical College, Chulalongkorn University
Due to high diffusivity, mesoporous catalysts and their composites are potential catalysts worth being tested for the dehydration of bio-ethanol. Hierarchical mesoporous MSU-SZSM-5 (Michigan State University) material has been successfully synthesized using HZSM-5 zeolite as a seed (denoted as SZSM-5). Subsequently, the HZSM-5 zeolite and its hierarchical mesoporous MSU-SZSM-5 material were studied for their catalytic activity and stability in bio-ethanol dehydration in this work. The reaction was conducted in a U-tube fixed bed reactor at 450 degrees C for 4 days. The results showed that propane selectivity decreased, and ethylene, propylene, and mixed C4 increased in the gas from using HZSM-5 catalyst whereas the gas product of MSU-SZSM-5 was mostly composed of ethylene. Moreover, HZSM-5 still maintained the production of large hydrocarbons such as C9 and C10(+) aromatics along with 96 h of time-on-stream because its pore size was less proper for coke deposition. On the other hand, for MSU-SZSM-5, the selectivity of C10(+) aromatic fraction decreased along with time-on-stream due to coke deposition. Furthermore, the spent catalysts were examined for their textural properties. HZSM-5 showed the better catalytic activity and textural properties than that of MSU-SZSM-5, indicating by a lower % decrease in surface area, lower amount of coke deposited, lower decrease in acidity, and no dealumination during 4 days of bio-ethanol dehydration. However, MSU-SZSM-5 produced a significantly-higher content of large hydrocarbons such as kerosene and gas oil. (C) 2016 Elsevier Ltd. All rights reserved.
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