Effect of calcination temperature on the application of molybdenum trioxide acid catalyst: Screening of substrates for biodiesel production

Pinto, Bernardo Ferreira; Garcia, Marco Aurélio Suller; Costa, Juliana Leles; Moura, Carla Verônica Rodarte de; Abreu, Wiury Chaves de; Moura, Edmílson Miranda de

doi:10.1016/j.fuel.2018.11.025

Cited by 60 publications

(52 citation statements)

References 29 publications

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“…Yields were slightly lower (50-56%) for solids calcined at lower temperatures (300-500 • C), and dropped to 43% for MoO 3 calcined at 700 • C. This trend is similar to the one observed in our work. Ferreira Pinto et al [23] performed the catalytic tests at considerably higher temperature (150 • C) and methanol to feedstock molar ratio (30:1) than in this work, being the catalyst concentration also higher (5 wt.%), though the vegetable oil contained double FFAs concentration (10 wt.%). These authors found a correlation between the catalytic activity and the acidity of the solids as determined through a titration technique in which aqueous NaOH previously contacted with the catalyst was neutralized with HCl.…”

Section: Catalytic Performancementioning

confidence: 79%

“…Ferreira Pinto et al [23] reported a maximum FAME yield of 64.2% for an unsupported MoO 3 catalyst calcined at 600 • C after 4 h of reaction during the methanolysis of soybean oil acidified with 10 wt.% of oleic acid. Yields were slightly lower (50-56%) for solids calcined at lower temperatures (300-500 • C), and dropped to 43% for MoO 3 calcined at 700 • C. This trend is similar to the one observed in our work.…”

Section: Catalytic Performancementioning

confidence: 99%

“…1000 ppm of Mo measured is close to the solubility limit of the molybdenum species in the polar phase. Ferreira Pinto et al [23] reutilized unsupported MoO 3 in eight consecutive cycles of acidified soybean oil methanolysis. The catalyst was filtered from run to run and was used without washing.…”

Section: Catalysts Stabilitymentioning

confidence: 99%

“…Molybdenum compounds are characterized by a remarkable versatility as catalysts, a fact that is related to the ability of this metal to be present on the solid surface in different oxidation states, ranging from Mo 6+ to metallic Mo (Mo 0 ) [21]. Anhydrous sodium molybdate [22], bulk MoO 3 [23], and molybdenum supported on alumina [24], silica, silica-alumina, and titania [25,26], as well as carbon [27] have been used as esterification and transesterification catalysts for biodiesel production from several oils, including waste oil.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 (MoO 3 ), 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 MoO 3 is very active for both transesterification and esterification reactions, but it suffered from severe molybdenum leaching in the reaction medium. When supported on Al 2 O 3 , the MoO 3 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 MoO 3 -Al 2 O 3 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 MoO 3 offers an attractive route for the valorization of oils with high FFAs content.Catalysts 2020, 10, 158 2 of 14 of this strategy is obtaining a more sustainable alternative fuel that contributes to reducing the CO 2 emissions to the atmosphere and the dependency of the energy system on petroleum. On the other hand, the basic catalysts usually used in the biodiesel industry (KOH, NaOH, and potassium and sodium methoxides) have important drawbacks [4]. Although they could be replaced by heterogeneous solid catalysts to make their re-utilization possible, some issues concerning those materials such as the lack of the required chemical stability are still not well solved [5][6][7]. Moreover, basic catalysts are not capable of suitably processing virgin, non-edible or waste feedstocks, which are characterized by being relatively rich in free fatty acids (FFAs), because they result deactivated and/or consumed, e.g., by the formation of soaps that also complicate the separation of the products due to their emulsifying properties. In these cases, acid catalysts can be used to perform a pre-esterification of the FFAs followed by base-catalyzed transesterification giving rise to the so-called integrated process for biodiesel production from high FFAs-containing triglyceride feedstocks [1,8]. Nevertheless, this is a multistep process that introduces complexity, thus reducing the competitive advantage of using low-cost feedstocks. It would be more convenient to perform the simultaneous transformation of the triglycerides and FFAs into FAMEs, which can be in fact accomplished using heterogeneous acid catalysts [9][10][11].Heterogeneous acid catalysts considered for biodiesel production comprise a large variety of materials [8][9][10][11][12][13][14][15][16][17][18]. The most representative ones consist on sulfated and tungsta...

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Section: Catalytic Performancementioning

confidence: 79%

Section: Catalytic Performancementioning

confidence: 99%

Section: Catalysts Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

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“…In the study by Pinto et al [60] , the molybdenum trioxide (MoO 3 ) was obtained by hydrothermal synthesis and had its catalytic performance evaluated by transesterification reactions of soybean oil, when the catalyst also showed high stability. However, different experimental conditions were used: oil:alcohol molar ratio of 1:45, 423 K, 0.5 wt% of catalyst, and time 4 h.…”

Section: Resultsmentioning

confidence: 99%

Copper molybdate synthesized by sonochemistry route at room temperature as an efficient solid catalyst for esterification of oleic acid

Silva

Nobre

Freitas

et al. 2021

Ultrasonics Sonochemistry

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Highlights Easy obtention of Cu 3 (MoO 4 ) 2 (OH) 2 by sonochemistry route at room temperature. Urchin-like morphology was obtained in aqueous solution using the sonochemistry method for copper molybdate. High conversion rate in the esterification of oleic acid using the Cu 3 (MoO 4 ) 2 (OH) 2 as a solid catalyst.

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Advances in Production of Biodiesel from Vegetable Oils and Animal Fats

Rashid

Hazmi

2022

Biodiesel Production

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Effect of calcination temperature on the application of molybdenum trioxide acid catalyst: Screening of substrates for biodiesel production

Cited by 60 publications

References 29 publications

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

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

Copper molybdate synthesized by sonochemistry route at room temperature as an efficient solid catalyst for esterification of oleic acid

Advances in Production of Biodiesel from Vegetable Oils and Animal Fats

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