Biodiesel production by soybean oil methanolysis over SrO/MgO catalysts

Dias, Ana Paula Soares; Bernardo, Joana R.; Felizardo, Pedro; Correia, M. Joana Neiva

doi:10.1016/j.fuproc.2012.04.039

Cited by 46 publications

(16 citation statements)

References 39 publications

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“…The decreases in yield after each cycle were supported by the decreasing trend shown by the CaO phase concentration determined by XRD. SrO/MgO deactivation, studied by Dias et al [9], was ascribable to the Sr leaching underlined by XRD. Deng et al [22] also found that the active sites of the hydrotalcite Mg/Al catalyst disappeared due to its structure collapsed.…”

Section: Analytical Approaches For Cao/mgo Based Catalyst Activity Chmentioning

confidence: 86%

“…Ho et al [58] showed that the decrease of the catalytic activity of palm oil mill fly ash supported calcium oxide in biodiesel synthesis, greatly depends to the decreasing trend shown by the Ca concentration. Dias et al [9] examined SrO/MgO catalysts stability by using a same sample for several batch reactions. They found that the catalytic activity decays (after the 3 rd batch) with a decrease of Sr concentration in the catalyst, which is leached into reactional mixtures.…”

Section: Analytical Approaches For Cao/mgo Based Catalyst Activity Chmentioning

confidence: 99%

“…One can note among them, alkaline earth metal oxides (BaO, CaO, MgO) and SrO [8]. Listed in literature and used in transesterification, catalysts based calcium and magnesium oxides provided many advantages for instance; they could be prepared with high purity, possess great activity due to their higher basicity, have long catalyst lifetime, could run under moderate reaction conditions, and are capable of producing high biodiesel yield [4] [5] [9]. When CaO and MgO are doped with other oxides, this enhances their catalytic performance.…”

mentioning

confidence: 99%

“…Many studies are cited in literature: CaO/MgO [11] [12], CaO/CeO [13], CaO/ ZnO [11] [14] [15], CaO/ZrO 2 [16] [17], MgO/SrO [9], CaO/aluminate [18], CaO/silicate [19] [20], Mg/Al oxides [18] [24], CaO/activated charcoal [25], CaO-KF [26] [27] [28] [29], MgO/KOH [30], Ti/MgO [31], MgO/chitosan [32], and CaO/zeolite [33].…”

mentioning

confidence: 99%

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Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review

Oueda¹,

Bonzi-Coulibaly²,

Ouédraogo³

2017

MSA

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The activity of a catalyst in transestrification reaction usually declines with repeated uses and this limits the possibility to use it many times. This paper presents a review of various techniques used to evaluate the activity changes, the recycling processes for calcium and magnesium oxides based heterogeneous catalysts for biodiesel production. The activity of calcium and magnesium oxides based catalysts declines due to leaching, surface or active sites poisoning by reactant or product molecules and modification of physical aspects. Physico-chemical methods (AAS, BET, CO 2 -TPD, EDS, FTIR, ICP-AES, SEM, TG/DTA and XRD) were used to check the catalyst modification and to confirm the deactivation. When separated from the reaction mixture by filtration, the catalyst could be reused without any treatment or recycled by washing, drying or/and recalcination. Between various recycling processes for calcium and magnesium oxides based catalysts, mixed oxides showed less leaching and performed FAME or FAEE yield >90% with reusability.

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Section: Analytical Approaches For Cao/mgo Based Catalyst Activity Chmentioning

confidence: 86%

Section: Analytical Approaches For Cao/mgo Based Catalyst Activity Chmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review

Oueda¹,

Bonzi-Coulibaly²,

Ouédraogo³

2017

MSA

View full text Add to dashboard Cite

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“…However, there is an intense weight loss (Δm = 21.2%) between the temperature of 351 to 412 °C, which corresponds to Sr(OH) 2 decomposition since SrO is high hydroscopic, which promotes the hydroxide formation. 35 The CoFe 2 O 4 ( Figure 4) synthesis was confirmed by X-ray diffraction, using the Joint Committee on Powder Diffraction Standard (JCPDS) crystallographic patterns, available at Crystallographica Search Match software. Basically, the diffractogram pattern of the calcined SrCO 3 (Figure 4c) was indexed for SrO, Sr(OH) 2 and SrCO 3 , which corroborates the oxide formation (JCPDS 6-520).…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

Falcão¹,

Garcia²,

Moura³

et al. 2017

J. Braz. Chem. Soc.

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Biodiesel production has gained a lot of attention due to its environmental benefits and production from renewable sources. Here, it is reported a magnetically recoverable catalyst of SrO immobilized on a CoFe 2 O 4 support (SrO/CoFe 2 O 4 ), which was efficiently applied for babassu oil transesterification and used up to four cycles without a significant activity loss. The stability and performance of the catalyst were analyzed considering the solvent used for its synthesis. Characterizations such as vibrating sample magnetometer (VSM), thermogravimetry (TG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were performed. The present study demonstrated that the catalyst has a strong magnetic response, which reflects the nature of the nanoparticles. For the first run, the material presented a yield of 96% when synthesized in acetone in a molar proportion of SrO/CoFe 2 O 4 of 5:1.

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A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

Tang

Liu

et al. 2018

ChemCatChem

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A novel KF‐modified nanorod support Zr−Ce oxide as an efficient solid base catalyst was prepared. XRD, FT‐IR, CO2‐TPD, TEM‐EDS, and Raman were employed for the catalyst characterization. The results showed that the appropriate activation temperature could facilitate the insertion of K+ into the vacancy sites of the ZrO2−CeO2 nanorod support, and some new strong basic active sites of K3Zr2F11, KCe2F9, Ce2Zr2O7 were generated with the addition of KF on the mixed ZrO2−CeO2 support. The prepared KF/ZrO2−CeO2 as a solid base catalyst exhibited high activity and stability for transesterification of soybean oil with methanol to biodiesel. The high biodiesel yield of 99.8 % was obtained under the following conditions: 15 wt % KF loading amount, calcination temperature 400 °C, molar ratio of methanol/oil 20 : 1, 5 wt % catalyst account (wt/wt oil), reaction time 5 h at 65 °C. The formation of basic active sites of the KF/ZrO2−CeO2 catalyst and the mechanism for the catalytic reaction were explored.

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Biodiesel production by soybean oil methanolysis over SrO/MgO catalysts

Cited by 46 publications

References 39 publications

Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review

Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

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