期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 279, 期 -, 页码 10-18出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.12.009
关键词
Renewable levulinic acid; Sulfated SnO2; Clinoptilolite; Esterification; Biolubricant production
类别
资金
- Ministry of Education, Science and Technological Development of the Republic of Serbia [172018]
- Slovenian Research Agency [P-0021]
- COST Action [FP1306]
Catalysts based on natural zeolite - clinoptilolite loaded with either SnO2 (TOHCLI) or sulfated SnO2 (STOHCLI) were prepared and tested in the esterification of levulinic acid (LA) with octanol or ethanol. The Sn content in TOHCLI and STOHCLI varied from 4.5 to 12.3 wt.%. The catalysts were characterized by powder X-ray diffraction method, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, thermal analysis, X-ray photoelectron spectroscopy, NZ physisorption at - 196 degrees C, (27)A1 and Si-29 MAS NMR solid state spectroscopy and FTIR spectroscopy for analysis of acidic centers. A high conversion rate of LA into octyl- (OLA) or ethyl levulinate (ELA) was obtained for both TOHCLI and STOHCLI. TOHCLI showed a high activity in the conversion of LA into OLA (55%) and a moderate activity in the conversion to ELA (22%). STOHCLI led to a total conversion of LA to OLA and ELA due to the presence of a high amount of Bronsted and Lewis acid sites in the catalysts. The catalytic activity decreased to 86% for OLA and to 66% for ELA after next five cycles. Lower catalytic activity in the repeated cycles during ELA formation was explained by pore blockage due to coke formation.
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