Efficient solid acid catalysts for esterification of free fatty acids with methanol for the production of biodiesel

2011 ◽  
Vol 1 (4) ◽  
pp. 662 ◽  
Author(s):  
K. Srilatha ◽  
Ch. Ramesh Kumar ◽  
B. L. A. Prabhavathi Devi ◽  
R. B. N. Prasad ◽  
P. S. Sai Prasad ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts

scholarly journals Catalytic Performance of Bulk and Al2O3-Supported Molybdenum Oxide for the Production of Biodiesel from Oil with High Free Fatty Acids Content

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 158 ◽  
Author(s):  
Alberto Navajas ◽  
Inés Reyero ◽  
Elena Jiménez-Barrera ◽  
Francisca Romero-Sarria ◽  
Jordi Llorca ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Molybdenum Oxide ◽  
Solid Acid ◽  
Reaction Medium ◽  
Active Phase ◽  
Catalytic Performance ◽  
Acid Catalysts ◽  
Basic Catalysts ◽  
Esterification Reactions

Non-edible vegetable oils are characterized by high contents of free fatty acids (FFAs) that prevent from using the conventional basic catalysts for the production of biodiesel. In this work, solid acid catalysts are used for the simultaneous esterification and transesterification with methanol of the FFAs and triglycerides contained in sunflower oil acidified with oleic acid. Molybdenum oxide (MoO3), which has been seldom considered as a catalyst for the production of biodiesel, was used in bulk and alumina-supported forms. Results showed that bulk MoO3 is very active for both transesterification and esterification reactions, but it suffered from severe molybdenum leaching in the reaction medium. When supported on Al2O3, the MoO3 performance improved in terms of active phase utilization and stability though molybdenum leaching remained significant. The improvement of catalytic performance was ascribed to the establishment of MoO3-Al2O3 interactions that favored the anchorage of molybdenum to the support and the formation of new strong acidic centers, although this effect was offset by a decrease of specific surface area. It is concluded that the development of stable catalysts based on MoO3 offers an attractive route for the valorization of oils with high FFAs content.

Catalytic esterification of fatty acids using solid acid catalysts generated from biochar and activated carbon

2012 ◽  
Vol 190 (1) ◽  
pp. 122-132 ◽  
Author(s):  
James R. Kastner ◽  
Joby Miller ◽  
Daniel P. Geller ◽  
Jason Locklin ◽  
Lawrence H. Keith ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Activated Carbon ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts

Factors Influencing the Kinetics of Esterification of Fatty Acids over Solid Acid Catalysts

2011 ◽  
Vol 25 (9) ◽  
pp. 4106-4112 ◽  
Author(s):  
Jitendra Kumar Satyarthi ◽  
Sambhu Radhakrishnan ◽  
Darbha Srinivas
Keyword(s):  
Fatty Acids ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Factors Influencing ◽  
Kinetics Of

Hydrolysis of vegetable oils and fats to fatty acids over solid acid catalysts

2011 ◽  
Vol 391 (1-2) ◽  
pp. 427-435 ◽  
Author(s):  
J.K. Satyarthi ◽  
D. Srinivas ◽  
P. Ratnasamy
Keyword(s):  
Fatty Acids ◽  
Vegetable Oils ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Hydrolysis Of

Preparation of Strong Acid Catalysts by Sulfate Treatment of Calcined Boehmite

1992 ◽  
Vol 57 (11) ◽  
pp. 2241-2247 ◽  
Author(s):  
Tomáš Hochmann ◽  
Karel Setínek
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Aluminum Sulfate ◽  
Solid Acid ◽  
Strong Acid ◽  
Acid Strength ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Preparation Methods ◽  
Indicator Method

Solid acid catalysts with acid strength of -14.52 < H0 < -8.2 were prepared by sulfate treatment of the samples of boehmite calcined at 105-800 °C. Two preparation methods were used: impregnation of the calcined boehmite with 3.5 M H2SO4 or mixing of the boehmite samples with anhydrous aluminum sulfate, in both cases followed by calcination in nitrogen at 650 °C. The catalysts were characterized by measurements of surface area, adsorption of pyridine and benzene, acid strength measurements by the indicator method and by catalytic activity tests in the isomerization of cyclohexene, p-xylene and n-hexane. Properties of the catalysts prepared by both methods were comparable.

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