期刊
ENERGY & FUELS
卷 24, 期 3, 页码 2154-2161出版社
AMER CHEMICAL SOC
DOI: 10.1021/ef1001452
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资金
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
The relative roles of surface acidity and hydrophobicity in the methylation of fatty acids (C-8 - C-18) to the corresponding methyl esters were investigated over three solid acid catalysts: Fe-Zn double-metal cyanide (DMC), sulfated zirconia (SZ), and Al-MCM-41. The esterification reaction was faster and the apparent activation energy was lower over SZ and Al-MCM-41 than on DMC because of their higher acid strength, specific surface area, and pore diameter. Over SZ and Al-MCM-41, the apparent activation energy for esterification increased with the chain length of the fatty acid. A reverse trend, however, was observed over DMC. The relative adsorption of methanol and fatty acids (compared to water) was higher on DMC than on SZ and Al-MCM-41. Hence, in addition to the acidic and textural properties, surface hydrophobicity and relative surface coverage by reactants/products also play an important role in reactions of long-chain fatty acids with alcohols on solid catalysts.
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