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Kinetics of the esterification of palmitic acid with methanol catalyzed by 12-tungstophosphoric acid supported on ZrO2
被引:22
|作者:
Srilatha, K.
[1
]
Lingaiah, N.
[1
]
Prasad, P. S. Sai
[1
]
Devi, B. L. A. Prabhavathi
[2
]
Prasad, R. B. N.
[2
]
机构:
[1] Indian Inst Chem Technol, Catalysis Div, Hyderabad 500007, Andhra Pradesh, India
[2] Indian Inst Chem Technol, Ctr Lipid Sci & Technol, Hyderabad 500007, Andhra Pradesh, India
关键词:
Esterification;
Biodiesel;
Kinetic model;
Palmitic acid;
12-Tungstophosphoric acid;
Zirconia;
ION-EXCHANGE-RESINS;
BIODIESEL PRODUCTION;
HYDROUS ZIRCONIA;
FATTY-ACIDS;
ACETIC-ACID;
SILICA;
ALKYLATION;
CONVERSION;
STABILITY;
ACYLATION;
D O I:
10.1007/s11144-011-0334-z
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
A series of catalysts containing 5-25 wt% 12-tungstophosphoric acid supported on hydrous zirconia were prepared and their catalytic activity evaluated for the esterification of palmitic acid with methanol. These catalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, surface area (BET method), and potentiometric titration for the estimation of acidity. The catalyst with 20 wt% TPA calcined at 300 A degrees C exhibited the highest activity. The effects of reaction variables such as catalyst loading, methanol to acid molar ratio and reaction temperature were studied. The pseudo-homogeneous (PH), Eley-Rideal (ER) and Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic models were applied to correlate the experimental kinetic data and kinetic parameters were evaluated. The LHHW model gave the best fit.
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页码:211 / 226
页数:16
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