Pseudo-first order reaction kinetics and thermodynamic properties study of neem oil esterification using MgO grafted natural hydroxyapatite

Sahu, Himadri; Mohanty, Kaustubha

doi:10.1039/c5ra25095a

Cited by 14 publications

(7 citation statements)

References 20 publications

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“…When second-order reaction model, n = 2, Equation (1) can be written as 1/(1 − x ) = kt . K is the kinetic constant, and the value is related to the reaction system and temperature. Hence, the reaction temperature effect on the kinetic model was studied by using the Arrhenius equation, which is listed as [21]: K = A 1 exp(− E a / RT ). A refers to the pre-exponential factor, E a is the activation energy, R is the ideal gas constant, and T is the absolute temperature. The relationship between ln k and 1/ T can be derived from Equation (4):ln k = A 2 + (− E a / RT ).…”

Section: Resultsmentioning

confidence: 99%

“…K is the kinetic constant, and the value is related to the reaction system and temperature. Hence, the reaction temperature effect on the kinetic model was studied by using the Arrhenius equation, which is listed as [ 21 ]: K = A 1 exp(− E a / RT ). A refers to the pre-exponential factor, E a is the activation energy, R is the ideal gas constant, and T is the absolute temperature.…”

Section: Resultsmentioning

confidence: 99%

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Performance and Kinetics Study of Self-Repairing Hydroxyl-Terminated Polybutadiene Binders Based on the Diels–Alder Reaction

Liang

Xia

et al. 2017

Polymers

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Based on the Diels-Alder reaction and hydroxyl-terminated polybutadiene (HTPB) binders of solid propellants, two novel compounds-furfuryl-terminated polybutadiene (FTPB) and trifurfuryl propane (TFP)-were designed and synthesized, and their structures were characterized. A new kind of reversible Diels-Alder reaction system was formed by FTPB as main resin, N,N -1,3-phenylenedimaleimide (PDMI) as curing agent and TFP as chain extender. The results showed that this system had good mechanical properties with a tensile strength of 1.76 MPa and a tensile strain of 284% after curing, and the repair efficiency of the crack was 88%. Therefore, it could be used as a novel binder of energetic materials such as solid propellant and PBX explosives to provide them with self-repairing characteristics and improve the reliability for application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Performance and Kinetics Study of Self-Repairing Hydroxyl-Terminated Polybutadiene Binders Based on the Diels–Alder Reaction

Liang

Xia

et al. 2017

Polymers

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“…Parameter WNH CWNH WNH-Zn CFWB-HAp-Al [12] Mg-NHAp [19] BET surface area 10 However, WNH-Zn was prepared at 650 8C, which leads to the further degradation in TGA profile. The additional mass loss was due to the removal of all the organic compounds present in the core of the sample.…”

Section: Methodsmentioning

confidence: 99%

“…The surface structure and elemental composition of WNH is described in the earlier published work. [19] The FESEM micrographs (Figure 3) of CWNH and WNH-Zn gave insight into the structure of pores formed after calcination, ZnO deposition, and elemental study. After calcination at 650 8C, the carbonates are decomposed, and the surface structure becomes irregular, i.e.…”

Section: Methodsmentioning

confidence: 99%

One pot peroxidation of oleic acid rich Azadirachta indica oil over bio‐waste derived heterogeneous catalyst

Sahu

Mohanty

2017

Can J Chem Eng

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In this work, a heterogeneous catalyst was developed from waste fish bone. ZnO was deposited onto the waste fish bone to enhance the surface properties along with ion exchangeability. After characterization, the developed catalyst was found to have a much higher surface area (217 m2 · g−1) than that of raw fish bone (10 m2 · g−1). This catalyst was used during peroxidation of oleic acid rich Azadirachta indica oil (neem oil) to observe its suitability and efficiency. A quadratic model was developed with five input variables (temperature (T), time (t), g/g of catalyst (HZn), H2O2:oil ratio (γH:FA), formic acid:oil ratio (γF:FA)) and 2 output variables (Iodine value, Oxirane Oxygen Conversion). The optimized parametric values for T, t, HZn, γH:FA, and γF:FA were found to be 60 °C, 3.88 h, 20 g/g, 19.05:1, and 19.85:1 respectively. The final epoxidized oil was characterized using FTIR and 1HNMR. The reusability of the catalyst was studied both quantitatively and qualitatively.

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“…In the same year, Sahu and Mohanty reported a facile process to prepare a catalyst from the waste of fishbone as a source of natural hydroxyapatite (NHAp) and magnesium sulfate. The Mg‐NHAp was prepared via grafting of magnesium oxide (MgO) during wet impregnation for the deposition of Mg ions on NHAp 107 . The Mg‐NHAp catalyst had excellent catalytic activity in the neem oil ( Azadirachta indica ) esterification and the maximum yield of 96.7% was found at oil/MeOH molar ratio of 1:15, 6 mass % of the catalyst and temperature of 70 °C.…”

Section: Catalytic Applications Of Bone Waste‐based Catalystsmentioning

confidence: 99%

Low‐cost and sustainable (nano)catalysts derived from bone waste: catalytic applications and biofuels production

Nasrollahzadeh

Bidgoli

Shafiei

et al. 2020

Biofuels Bioprod Bioref

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The application of (bio)wastes as alternatives to expensive existing catalysts is an approach that can be used to reduce environmental pollution problems. Animal bone wastes have attracted much attention as environmentally friendly heterogeneous catalysts for chemical transformations such as transesterification, oxidation, and biofuel production, owing to the substantial availability of valuable hydroxyapatite (HAp) in their structure. Most catalysts based on bone can be prepared easily by calcination. High-temperature calcination yields highly active catalysts. Heterogeneous catalysts prepared from these renewable sources could also simply be reused and recovered without any important loss of catalytic performance. This paper reviews past efforts and recent progress on the development of different eco-friendly catalysts derived from bone waste and some of their catalyzed chemical transformations. However, future challenges focus on crediting the conversion of unusable wastes to valuable sources to meet global requirements

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Pseudo-first order reaction kinetics and thermodynamic properties study of neem oil esterification using MgO grafted natural hydroxyapatite

Abstract: In this work, waste fish bone was used as a source of natural hydroxyapatite which was later used for the preparation of a metal grafted catalyst.

Cited by 14 publications

References 20 publications

Performance and Kinetics Study of Self-Repairing Hydroxyl-Terminated Polybutadiene Binders Based on the Diels–Alder Reaction

Performance and Kinetics Study of Self-Repairing Hydroxyl-Terminated Polybutadiene Binders Based on the Diels–Alder Reaction

One pot peroxidation of oleic acid rich Azadirachta indica oil over bio‐waste derived heterogeneous catalyst

Low‐cost and sustainable (nano)catalysts derived from bone waste: catalytic applications and biofuels production

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