Zirconia-supported tungstophosphoric heteropolyacid as heterogeneous acid catalyst for biodiesel production

Alcañiz-Monge, Juan; Bakkali, Bouchra El; Trautwein, Guido; Reinoso, Santiago

doi:10.1016/j.apcatb.2017.10.066

Cited by 135 publications

(48 citation statements)

References 48 publications

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“…The zirconia support was generated by hydrolysis of an alkoxyde precursor in the presence of the heteropolyacid, which led to materials with homogeneously well-dispersed clusters, as well as to an increasing contribution of the tetragonal ZrO 2 crystalline phase. A sample with a 30% mass percentage of heteropolyacid was identified as the most efficient catalyst because it afforded conversions above 90% and showed lower loss of activity over successive reaction runs among the studied materials [74].…”

Section: Zro 2 -Based Catalystsmentioning

confidence: 99%

Biodiesel Production Using Solid Acid Catalysts Based on Metal Oxides

et al. 2020

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The development of solid acid catalysts, especially based on metal oxides and different magnetic nanoparticles, gained much awareness recently as a result of the development of different nano-based materials. Solid acid catalysts based on metal oxides are promising for the (trans)esterification reactions of different oils and waste materials for biodiesel production. This review gives a brief overview of recent developments in various solid acid catalysts based on different metal oxides, such as zirconia, zinc, titanium, iron, tungsten, and magnetic materials, where the catalysts are optimized for various reaction parameters, such as the amount of catalyst, molar ratio of oil to alcohol, reaction time, and temperature. Furthermore, yields and conversions for biodiesel production are compared. Such metal-oxide-based solid acid catalysts provide more sustainable, green, and easy-separation synthesis routes with high catalytic activity and reusability than traditionally used catalysts.

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Section: Zro 2 -Based Catalystsmentioning

confidence: 99%

Biodiesel Production Using Solid Acid Catalysts Based on Metal Oxides

et al. 2020

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“…The numerous disadvantages of homogenous base and acid catalysts, such as soap formation, catalyst recovery, high corrosion, and inhibition by water [1,24] can be replaced using heterogeneous catalysts such as alkaline [25] and alkaline earth metal oxides [2,26,27], mixed oxides [28][29][30], modified layered double hydroxides [31][32][33][34], zeolites [35][36][37], sulfonated solids [38], ion exchange resins [39][40][41], supported heteropolyacids [42,43], etc. In order to design new catalysts based on the modern concept of environmental protection, greatest attention of many scientists is directed at investigation of different waste materials (fly ash from coal-fired power stations (CFPSs), biomass fly ash, agricultural and animal waste, industrial waste reach in calcium such as mud and slug, and natural sources) for potential catalyst synthesis, which can often be very dangerous and leave a lasting impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Stanković¹,

Pavlović²,

Marinković³

et al. 2020

Renewable Energy - Resources, Challenges and Applications

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Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. The present review is focused on CFA origin, chemical properties, and its catalytic application for biodiesel production. The aluminosilicate nature and the presence of rare earth elements make CFA suitable for different adsorption, catalytic, and extraction processes for obtaining valuable products including alternative fuels and pure elements. However, the presence of toxic elements is a potential environmental problem, which should be solved in order to avoid soil, water, and air pollution. The most used modification methods are alkali activation, hydrothermal, and thermal treatment that improve the structural, morphological, and textural properties. The active catalytic form could be obtained by impregnation or ion exchange method. It was found that such synthesized materials have significant catalytic potential in the biofuel chemistry. In the case of biodiesel production, the high values of conversion or yield can be achieved under mild low-energy reaction conditions in the presence of low-cost waste-based catalysts.

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“…Therefore, not only its catalytic activity and selectivity were improved, but also the product was easy to separate, and the catalyst was easily regenerated, the production process was simplified. There are many works studying polyoxometalate on a variety of supports (Hanif et al, 2017 ; Alcañiz-Monge et al, 2018 ; Yuan et al, 2020 ), the research on surface properties showed that supporting polyoxometalate firmly on the support was key (Hu et al, 1995 ). Activated carbon not only has high specific surface area and large pore size but also can be adjusted as needed; it was a good catalyst support.…”

Section: Introductionmentioning

confidence: 99%

Efficient Hydrogen Generation From Hydrolysis of Sodium Borohydride in Seawater Catalyzed by Polyoxometalate Supported on Activated Carbon

Wang

et al. 2020

Front. Chem.

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Phosphotungstic acid (HPW) as a polyoxometalate was selected as the active component of the catalyst. The activated carbon supported different percentage of HPW catalysts were prepared by impregnation and were characterized by X-ray diffraction (XRD), nitrogen adsorption, Fourier transform infrared (FTIR), and scanning electron microscope (SEM). The results showed that the HPW retained the original Keggin structure after being supported on activated carbon, the specific surface of the HPW/C was much bigger than that of pure HPW. The catalytic performance of HPW/C in the hydrogen generation reaction by hydrolysis of sodium borohydride in seawater and in deionized water were studied. 2.5 wt.% HPW/C showed the fastest hydrolysis reaction rate and the biggest volume of hydrogen generated. As for hydrolysis of sodium borohydride, catalytic effect of HPW/C was better in seawater than in distilled water. HPW dispersed on activated carbon is a real promising catalytic system for the development of hydrogen generation by hydrolysis of NaBH 4 in seawater.

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Zirconia-supported tungstophosphoric heteropolyacid as heterogeneous acid catalyst for biodiesel production

Cited by 135 publications

References 48 publications

Biodiesel Production Using Solid Acid Catalysts Based on Metal Oxides

Biodiesel Production Using Solid Acid Catalysts Based on Metal Oxides

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Efficient Hydrogen Generation From Hydrolysis of Sodium Borohydride in Seawater Catalyzed by Polyoxometalate Supported on Activated Carbon

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