期刊
APPLIED CATALYSIS A-GENERAL
卷 575, 期 -, 页码 101-110出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2019.02.011
关键词
Mesoporous ZSM-5; Ethanol; Oleic acid; Light olefins; Catalytic cracking
资金
- National Natural Science Foundation of China [21566004]
- Guangxi Natural Science Foundation [2015GXNSFAA139036]
- Scientific Research Foundation of Guangxi University [XGZ120081, XTZ140787, XJPZ160713]
- 2018-2019 Guangxi University college students' innovative and entrepreneurial training plan [201810593185]
Conversion of biomass-derived chemicals into light olefins is a promising method to maintain sustainable development of light olefin industry. In this study, three mesoporous ZSM-5 zeolites (MZSM-5-A, MZSM-5-B and MZSM-5-C) with major pore diameter about 4.8 nm, 16 nm and 22 nm were synthesized using a hydrothermal method by utilizing different templates. The catalytic activity of catalysts was studied by catalytic cracking of ethanol and oleic acid. The influence of reaction temperature on conversion and product selectivity was investigated. The characterization of ZSM-5 samples showed that the orders of the external surface area and mesopore volume were MZSM-5-C > MZSM-5-B > MZSM-5-A > conventional HZSM-5. In ethanol to light olefin reaction, MZSM-5-C achieved the highest light olefin yield (318.3 inL g(-1)) and ethylene selectivity (42.3%) at 400 degrees C. In oleic acid to light olefin reaction, MZSM-5-B achieved a complete conversion of oleic acid at 500 degrees C, and obtained the highest light olefin selectivity (38.1%) at 550 degrees C. The difference may be relevant to the size and chemical structure of feedstock molecular as well as the acidity of catalysts. Regardless of ethanol or oleic acid as feedstock, introduction of mesopore in zeolites significantly enhanced the light olefin yield and selectivity.
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