MgM (M=Al and Ca) oxides as basic catalysts in transesterification processes

Albuquerque, Mônica C. G.; Santamaría‐González, J.; Mérida‐Robles, J.; Moreno‐Tost, Ramón; Rodríguez‐Castellón, Enrique; Jiménez‐López, Antonio; Azevedo, Diana C. S.; Cavalcante, Célio L.; Maireles‐Torres, Pedro

doi:10.1016/j.apcata.2008.06.016

Cited by 93 publications

(37 citation statements)

References 36 publications

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“…of the Mg 2p peak for the MgAl was 50.0 eV, in agreement with previous reports [23,24]. All the other samples exhibited a single feature for Mg 2p, indicative of a unique chemical environment at 49.5-50.0 eV expected for MgO.…”

Section: Characterization Of the Mgal And Mgalli Catalystssupporting

confidence: 90%

MgAlLi Mixed Oxides Derived from Hydrotalcite for Catalytic Transesterification

et al. 2011

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MgAl hydrotalcite was synthesized and used as support for Li impregnation. MgAlLi oxides were obtained from heat treatment of the Li/MgAl hydrotalcite. These materials were characterized and evaluated as catalysts for model transesterification reactions. MgAl showed negligible activity under mild reaction conditions (50°C and 0.5 h) whereas Li incorporation greatly increased the activity. The activities were correlated to their basicity determined by TPD of CO 2 . Reuse tests showed catalyst deactivation after the third cycle, probably due to lithium leaching. However, the contribution to a homogeneous reaction has been dismissed. MgAlLi revealed to be a promising catalysts for transesterification reaction and thus for biodiesel production.

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Section: Characterization Of the Mgal And Mgalli Catalystssupporting

confidence: 90%

MgAlLi Mixed Oxides Derived from Hydrotalcite for Catalytic Transesterification

et al. 2011

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“…In particular, CaO has been combined with ZnO [64], MgO [46,65], Al 2 O 3 [65,66], zeolite [48,65], SiO 2 [65,67], and La 2 O 3 [68] with improved base characteristics, activity and catalytic life. Rubio-Caballero et al [64] used the calcined calcium zincate as a solid catalyst for the methanolysis of sunflower oil to FAME resulting in yields higher than 90% after 45 min of reaction.…”

Section: Supported Cao Catalystsmentioning

confidence: 99%

Advancements in Heterogeneous Catalysis for Biodiesel Synthesis

et al. 2010

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Heterogeneous catalysts are promising for the transesterification reaction of vegetable oils to produce biodiesel and have been studied intensively over the last decade. Unlike the homogeneous catalysts, heterogeneous catalysts can be easily separated from reaction mixture and reused for many times. They are environmentally benign and could be easily operated in continuous processes. This review classifies the solid catalysts into two categories based on their catalytic temperature, i.e. high temperature catalysts and low temperature catalysts. The nature of the catalysts can be specified into solid bases and solid acids. Three aspects, catalyst activity, catalyst life and oil flexibility, will be reviewed. Two kinds of heterogeneous catalysts, reported by IFP Inc. and by WSU, respectively, show a high catalytic activity, long catalyst life and low leaching of catalyst components. These two catalysts also show ability to simultaneously catalyze esterification and transesterification, and can be used in half-refined or crude oil system which provide a potential for greatly decrease the feedstock cost.

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“…One type of heterogeneous catalyst widely used in for biodiesel production is alkaline earth metal based catalyst. This type of catalyst is of particular interest since divalent metal oxides such as CaO, MgO, BaO, SrO exhibit alkaline characteristic, thus, function as solid base catalysts [16][17][18][19][20]25,28 . Among the alkaline earth metal oxides, CaO is the most promising for several reasons include low price, low solubility in methanol, not toxic, high catalytic activity, and can be obtained from natural materials such as rocks, minerals, crabs, egg shells, as well as mollusks, simply by calcination treatment 16,23,28,29 .…”

Section: Introductionmentioning

confidence: 99%

“…At present, many types of chemical compounds have been tested as heterogeneous catalysts, such as the oxides of various metals, nonmetallic oxides, ion exchanges, zeolites, metal complexes, mixture of metal oxides, and supported metal oxides 7,9,[16][17][18][19][20][21][22][23][24][25][26][27] . One type of heterogeneous catalyst widely used in for biodiesel production is alkaline earth metal based catalyst.…”

Section: Introductionmentioning

confidence: 99%

Influence of Kinetic Variables on Rubber Seed Oil Transesterification Using Bifunctional Catalyst CaO-MgO/SiO2

Pandiangan¹,

Simanjuntak²,

Rilyanti³

et al. 2017

Orient. J. Chem

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In this study, syntheses of bifunctional catalyst (CaO-MgO/SiO 2 ) with different ratios of CaO: MgO:SiO 2 of 1:1:3 and 1:1:5 were carried out by sol-gel method. The catalysts were subjected to calcination temperatures of 500, 600, 700, 800, 900 o C for 6 h at peak temperatures, and then tested as catalyst in a series of transesterification of rubber seed oil without and with the use of coconut oil as co-reactant. Several kinetic variables of transesterification were also investigated. The results revealed that the catalyst with the composition of CaO-MgO/SiO 2 1:1:5 and subjected to calcination temperature of 800°C functioned as the most active catalyst. The highest percent of conversion 90% was resulted from the experiment with the use of 5% catalyst, 50 mL methanol, 10% co-reactant, temperature of 70 o C and reaction time of 6 hours.

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MgM (M=Al and Ca) oxides as basic catalysts in transesterification processes

Cited by 93 publications

References 36 publications

MgAlLi Mixed Oxides Derived from Hydrotalcite for Catalytic Transesterification

MgAlLi Mixed Oxides Derived from Hydrotalcite for Catalytic Transesterification

Advancements in Heterogeneous Catalysis for Biodiesel Synthesis

Influence of Kinetic Variables on Rubber Seed Oil Transesterification Using Bifunctional Catalyst CaO-MgO/SiO2

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