Superacidic Mesoporous Catalysts Containing Embedded Heteropolyacids

Kuvayskaya, Anastasia; Garcia, S.F.; Mohseni, Ray; Vasiliev, Aleksey

doi:10.1007/s10562-019-02738-2

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…46,47 A previous study has shown that heteropolyacids are very effective acidic catalysts for chemical processes; 48 however, straight heteropolyacids are readily solvable in polar environments, rendering recovery problematic, in addition to having a limited surface. 49,50 So, to prevent such penalties, the heteropolyacids should be encapsulated inside porous frameworks. 51,52 Recently, metal−organic frameworks (MOFs) have been obtaining popularity as heterogeneous catalysts as they contain remarkable adaptability.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, heterogeneous acid catalysts such as oxides of metal, heteropoly acids, ionic liquids (ILs), sulfonic-acid-functionalized catalysts, zeolites, and others are considered as popular catalysts in producing biodiesel; − their classification is depicted in Figure . However, these described catalytic systems possess one or more of these three drawbacks: poor conversion, high cost, and catalyst toxicity. , A previous study has shown that heteropolyacids are very effective acidic catalysts for chemical processes; however, straight heteropolyacids are readily solvable in polar environments, rendering recovery problematic, in addition to having a limited surface. , So, to prevent such penalties, the heteropolyacids should be encapsulated inside porous frameworks. , …”

Section: Introductionmentioning

confidence: 99%

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A Review on Metal–Organic Framework as a Promising Catalyst for Biodiesel Production

Nguyen,

Sharma,

Dzida

et al. 2024

Energy Fuels

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The rapid depletion of fossil-derived fuels along with rising environmental pollution have motivated academics and manufacturers to pursue more environmentally friendly and sustainable energy options in today's globe. Biodiesel has developed as an ecologically favorable alternative. However, the mass manufacturing of biodiesel on an industrial scale confronts substantial cost and pricing challenges. To address this issue, highefficiency catalysts with a large number of active sites are needed, resulting in increased biodiesel output and quality. Metal−organic frameworks (MOFs) have received a lot of interest as a catalyst for converting oils/fats or fatty acids into biodiesel. MOFs are polyporous materials that can alter pore size as well as topological structure. They serve as a versatile foundation for designing active sites to satisfy the unique needs of catalytic reactions and conversion pathways. The purpose of this current work is to shed light on the underlying mechanisms and essential properties of MOF-based catalysts used in biodiesel synthesis. In addition, several methods for connecting active sites inside MOFs are scrutinized, while the properties and usability of MOF-based catalysts for the biodiesel production process are completely compared to other catalysts. More importantly, limits and future research directions about the utilization of MOFs in the biodiesel synthesis route are also critically presented. In general, this review contributes to improved awareness about the potential of MOFs in the biodiesel production sector by investigating the primary mechanism and characteristics of MOF-based catalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review on Metal–Organic Framework as a Promising Catalyst for Biodiesel Production

Nguyen,

Sharma,

Dzida

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Particularly, if raw materials have an abundance of free fatty acids, the utilization of heterogeneous catalysts will be beneficial since they can avoid saponification. Actually, several types of heterogeneous catalysts such as ion-exchange resins, alkoxides, , Mg–Al hydrotalcites, − metal oxides and hydroxides, − carbon-based solid acids, and heteropoly acids , have been attempted for biodiesel production. However, the catalytic efficiency of these materials is greatly inhibited primarily by reason of their low surface area and pore volume. , …”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Synthesis and Characterization of Bimetallic UiO-66(Zr/Sn) Heterogeneous Catalyst for Biodiesel Production

Elyazed

Shaban

Sun

et al. 2023

Ind. Eng. Chem. Res.

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It has been verified that UiO-66(Zr) is an effective heterogeneous catalyst for the production of biodiesel. The construction of multimetal sites in the structure of UiO-66(Zr) can be a promising way to enhance the catalytic performance of UiO-66(Zr). In this contribution, UiO-66(Zr) with tin sites is simply fabricated under solvent-free conditions. The results from XRD, EDX, and XPS analyses indicate that tin species have been introduced into the structure of UiO-66(Zr). The nitrogen sorption data show that UiO-66(Zr/Sn)-5-130-24 obtained under optimized synthesis conditions maintains a large BET specific surface area (1170 m2/g) and pore volume (0.84 cm3/g). The NH3-TPD results reveal that UiO-66(Zr/Sn)-5-130-24 possesses more acid sites than UiO-66(Zr) probably because the introduction of tin species brought about the missing of linkers in the structure of UiO-66(Zr). As a consequence, UiO-66(Zr/Sn)-5-130-24 exhibits higher catalytic efficiency with an oleic acid conversion of 98.8% than UiO-66(Zr) (oleic acid conversion of 86.2%) at 333 K in the esterification reaction of oleic acid with methanol to obtain biodiesel. Furthermore, the reusability test demonstrates that such a catalyst can be readily recycled and reused.

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“…Different heterogeneous catalysts such as ion-exchange resins [7], alkoxides [8,9], Mg-Al hydrotalcites [10][11][12], metal oxides and hydroxides [13][14][15][16], carbon-based solid acids [17], and heteropolyacids [18,19] have been applied. However, the above-mentioned materials generally possess low surface area and suffered from recovery problem [20,21].…”

Section: Introductionmentioning

confidence: 99%

Solvent-free synthesis and characterization of bimetallic UiO-66(Zr/Sn) heterogeneous catalyst for biodiesel production

Aresha

Shaban

Sun

et al. 2022

Preprint

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UiO-66(Zr) has been demonstrated to be an efficient heterogeneous catalyst in the esterification of oleic acid and methanol for biodiesel production. For the development of multi-functional sites in the structure of UiO-66(Zr), direct synthesis of UiO-66(Zr) with extra metal centers is a challenge. Based on our previous work of solvent-free synthesis, tin-doped UiO-66(Zr) was prepared under solvent-free conditions. The produced materials were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), N2 sorption technique, Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD) analysis of NH3. The results indicate that UiO-66(Zr/Sn)-green with bimetal centers exhibits superior catalytic performance in the esterification of oleic acid. Additionally, the influence of tin integration on the structure and reactivity of UiO-66(Zr) significantly accelerates the esterification process at room temperature. Such catalyst could easily be recycled and reused.

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Superacidic Mesoporous Catalysts Containing Embedded Heteropolyacids

Cited by 11 publications

References 37 publications

A Review on Metal–Organic Framework as a Promising Catalyst for Biodiesel Production

A Review on Metal–Organic Framework as a Promising Catalyst for Biodiesel Production

Solvent-Free Synthesis and Characterization of Bimetallic UiO-66(Zr/Sn) Heterogeneous Catalyst for Biodiesel Production

Solvent-free synthesis and characterization of bimetallic UiO-66(Zr/Sn) heterogeneous catalyst for biodiesel production

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