Catalytic dehydration of glycerol to acrolein over M2.5H0.5PW12O40 (M=Cs, Rb and K) phosphotungstic acids: Effect of substituted alkali metals

Hamid, Sharifah Bee Abd; Daud, Nur Atiqah; Suppiah, Durga Devi; Yehya, Wageeh A; Sudarsanam, Putla; Bhargava, Suresh K.

doi:10.1016/j.poly.2016.08.027

Cited by 12 publications

(15 citation statements)

References 28 publications

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“…1c, MMS has no characteristic peaks. The characteristic peaks at 1005 cm −1 with neighbor bands at 990 and 215 cm −1 are ascribed to the W=O symmetric and asymmetric stretching and W-O-W bending mode in the Keggin unit from 110 to 1100 cm −1 (Hamid et al 2016). This result confirmed that HPW was loaded on the carrier surface and was not decomposed under 400 °C.…”

Section: Charactierization Of Samplessupporting

confidence: 54%

Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

et al. 2020

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It is usually difficult to remove dibenzothiophenes from diesel fuels by oxidation with molecular oxygen as an oxidant. In the study, tungsten oxide was supported on magnetic mesoporous silica by calcination to form a magnetically separable catalyst for oxidative desulfurization of diesel fuel. By tuning different calcining temperatures, the catalyst calcined at 500 °C showed a high catalytic activity with molecular oxygen as the oxidant. Under optimal reaction conditions, the sulfur removal of DBT reached 99.9% at 120 °C after 8 h. Furthermore, the removals of 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene could also get up to 98.2% and 92.3% under the same conditions. The reaction mechanism was explored by selective quenching experiments and FT-IR spectra.

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Section: Charactierization Of Samplessupporting

confidence: 54%

Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

et al. 2020

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“…10). 124,125 A series of bimetallic PtM/C (M = Mn, Fe, Co, Ni, Cu, Zn, and Au) catalysts were developed for the oxidation of glycerol. 126 Among them, Pt 9 Sn 1 /C catalyst showed the highest activity with a 91% of glycerol conversion and a 50% yield of glyceric acid.…”

Section: Conventional Carbon Based Catalystsmentioning

confidence: 99%

Functionalised heterogeneous catalysts for sustainable biomass valorisation

et al. 2018

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Efficient transformation of biomass to value-added chemicals and high-energy density fuels is pivotal for a more sustainable economy and carbon-neutral society. In this framework, developing potential cascade chemical processes using functionalised heterogeneous catalysts is essential because of their versatile roles towards viable biomass valorisation. Advances in materials science and catalysis have provided several innovative strategies for the design of new appealing catalytic materials with well-defined structures and special characteristics. Promising catalytic materials that have paved the way for exciting scientific breakthroughs in biomass upgrading are carbon materials, metal-organic frameworks, solid phase ionic liquids, and magnetic iron oxides. These fascinating catalysts offer unique possibilities to accommodate adequate amounts of acid-base and redox functional species, hence enabling various biomass conversion reactions in a one-pot way. This review therefore aims to provide a comprehensive account of the most significant advances in the development of functionalised heterogeneous catalysts for efficient biomass upgrading. In addition, this review highlights important progress ensued in tailoring the immobilisation of desirable functional groups on particular sites of the above-listed materials, while critically discussing the role of consequent properties on cascade reactions as well as on other vital processes within the bio-refinery. Current challenges and future opportunities towards a rational design of novel functionalised heterogeneous catalysts for sustainable biomass valorisation are also emphasized.

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“…These results indicate that the catalyst acidity and appropriate textural properties are crucial parameters for obtaining superior results in this reaction, consistent with the previous reports. 16,23 With further raising calcination temperature to 700 °C, the glycerol conversion, acrolein selectivity and acrolein yield decrease. This can be owing to the following reasons: (i) the formation of orthorhombic α-AlPO 4 crystalline phase under high calcination temperature; (ii) changes in the textural properties including decreased surface areas, pore volumes and pore sizes under high calcination temperature; and (iii) the decrease of acid sites under high calcination temperature.…”

Section: Catalytic Activitymentioning

confidence: 99%

Catalytic Dehydration of Glycerol to Acrolein over Aluminum Phosphate Catalysts

Ding

Liu

et al. 2020

J. Braz. Chem. Soc.

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Gas phase conversion of glycerol to acrolein over a variety of aluminum phosphate (AlP) catalysts synthesized by a simple replacement reaction method with a variation in calcination temperature (300-700 °C, AlP-300, AlP-400, AlP-500, AlP-600, and AlP-700, respectively) has been investigated. The textural properties, acidities and coke contents of the samples were also determined. The catalysts were presented in an amorphous state when the AlP sample was calcined below 500 °C. Further increasing the calcination temperature promoted the formation of orthorhombic α-AlPO 4 crystal. The weak acid sites increased when the calcination temperature was raised from 300 to 500 °C. However, the weak acid sites decreased when the AlP was calcined above 500 °C. The acidity of the catalyst played a crucial role in the glycerol dehydration reaction. The maximum acrolein selectivity of 66% at 98% glycerol conversion was obtained over AlP-500 catalyst, due to the largest number of acid sites and appropriate textural properties. AlP-700 exhibited the lowest glycerol conversion, owing to the formation of orthorhombic α-AlPO 4 crystalline phase and the lowest amount of acid sites under high calcination temperature. The significant reduction in the acidity of the used sample led to a decrease of glycerol conversion.

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Catalytic dehydration of glycerol to acrolein over M2.5H0.5PW12O40 (M=Cs, Rb and K) phosphotungstic acids: Effect of substituted alkali metals

Cited by 12 publications

References 28 publications

Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

Functionalised heterogeneous catalysts for sustainable biomass valorisation

Catalytic Dehydration of Glycerol to Acrolein over Aluminum Phosphate Catalysts

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