Investigation on thermal degradation properties of oleic acid and its methyl and ethyl esters through TG-FTIR

Niu, Shengli; Zhou, Yan; Yu, Hewei; Lu, Chunmei; Han, Kuihua

doi:10.1016/j.enconman.2017.07.053

Cited by 116 publications

(50 citation statements)

References 47 publications

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“…6 and 7, respectively, and the most intense peak was at 1737 cm −1 . This peak at 1737 cm −1 was also observed by Niu et al [68], who used FT-IR to characterize the ethyl esters formed from oleic acid, the major fatty acid in PO that is also present in MO.…”

Section: Ft-ir Analysissupporting

confidence: 76%

Ethyl esters obtained from pequi and macaúba oils by transesterification with homogeneous acid catalysis

Santos

Gurgel

Pereira

et al. 2020

Fuel

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Section: Ft-ir Analysissupporting

confidence: 76%

Ethyl esters obtained from pequi and macaúba oils by transesterification with homogeneous acid catalysis

Santos

Gurgel

Pereira

et al. 2020

Fuel

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“…The vibrational peaks across the sewage sludge spectra shown in Figure 3 reveal the presence of various functional groups peculiar to the following compounds, such as phenol (C–O–C), alkanes (C–H), alkenes (C=H), alcohol (C–OH), nitrogenous compounds (N=H), ketones (C=O), ester and aromatic/heterocyclic compounds, as well as moisture (H–O–H). The bands in the infrared spectrum assigned to both the torrefied and raw sewage sludge were done following the characterized FTIR presented in the literature [ 14 , 35 , 41 , 42 , 43 , 44 ]. The variation in the spectra reading for the torrefied and raw sewage sludge were as a result of the degradation of the organic polymers present in the samples after the torrefaction treatments.…”

Section: Resultsmentioning

confidence: 99%

Improving the Solid Fuel Properties of Non-Lignocellulose and Lignocellulose Materials through Torrefaction

et al. 2021

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Biomass torrefaction is a thermal pre-treatment technique that improves solid fuel properties in relation to its efficient utilization for energy generation. In this study, the torrefaction performance of sewage sludge, a non-lignocellulose biomass and sugarcane bagasse, a lignocellulose biomass were investigated in an electric muffle furnace. The influence of torrefaction temperature on the physiochemical properties of the produced biomaterial were examined. Characterization of the raw and torrefied biomass material were studied using thermogravimetric analysis, Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscopy. From the result obtained, it was evident that an increase in torrefaction temperature up to 350 °C caused a 33.89% and 45.94% decrease in volatile matter content of sewage sludge and sugarcane bagasse, respectively. At a higher temperature of 350 °C, the peak corresponding to OH stretching of hydroxyl group decreased in intensity for both biomasses, showing a decomposition of the hydroxyl group as a result of torrefaction. This enriched the lignin content of the torrefied samples, thus making these solid fuels good feedstock for energy production.

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“…Next, the peak which appeared at 924 cm −1 was attributed to the stretching modes of carbohydrates in the honey, such as C-O and C-C [ 40 ]. However, observation of the formulations A1, A2, and A3 indicated a peak around band 1740 cm −1 , which was attributed to the stretching vibration of C=O in the oleic acid [ 41 ]. Overall, the functional group of formulations A1, A2, A3 and the control sample, SBH, after being subjected to HPH for 5 cycles at 100 MPa at room temperature, was still the same as the functional group of the honey.…”

Section: Resultsmentioning

confidence: 99%

Optimisation of Stingless Bee Honey Nanoemulsions Using Response Surface Methodology

Rozman

Hashim

Maringgal³

et al. 2021

Foods

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Nanoemulsions (NEs) have been used in a wide range of products, such as those produced by the food, cosmetics, and pharmaceutical industries, due to their stability and long shelf life. In the present study, stingless bee honey (SBH) NEs were formulated using SBH, oleic acid, tween 80, glycerol, and double-distilled water. SBH NEs were prepared using a high-pressure homogeniser and were characterised by observing their stability and droplet size. Fourier Transform-Infrared (FTIR) analysis was used to observe the functional groups of the SBH NEs after being subjected to high-pressure homogenisation. Transmission Electron Microscopy (TEM) images were then used to confirm the particle size of the SBH NEs and to investigate their morphology. The effects of the independent variables (percentage of oleic acid, storage time, and storage temperature) on the response variables (particle size and polydispersity index) were investigated using the response surface methodology, along with a three-level factorial design. The results showed that the models developed via the response surface methodology were reliable, with a coefficient of determination (R2) of more than 0.90. The experimental validation indicated an error of less than 10% in the actual results compared to the predicted results. The FTIR analysis showed that SBH NEs have the same functional group as SBH. Observation through TEM indicated that the SBH NEs had a similar particle size, which was between 10 and 100 nm. Thus, this study shows that SBH NEs can be developed using a high-pressure homogeniser, which indicates a new direction for SBH by-products.

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Investigation on thermal degradation properties of oleic acid and its methyl and ethyl esters through TG-FTIR

Cited by 116 publications

References 47 publications

Ethyl esters obtained from pequi and macaúba oils by transesterification with homogeneous acid catalysis

Ethyl esters obtained from pequi and macaúba oils by transesterification with homogeneous acid catalysis

Improving the Solid Fuel Properties of Non-Lignocellulose and Lignocellulose Materials through Torrefaction

Optimisation of Stingless Bee Honey Nanoemulsions Using Response Surface Methodology

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