Copper Nanoparticle Catalysed Aerobic Oxidation of α-pinene

Nanocellulose has many applications in industrial sectors, such as in pulp and papermaking, production of synthetic textile fibers, dye, ink, and coating materials. The cellulose itself can be isolated from the waste of pine cone flower. This paper reports formic acid in the different concentrations (10%, 30%, and 60%) for hydrolyzing of cellulose using sonication technique (48 kHz) at 45 °C for 60 mins. The hydrolyzed cellulose was analyzed using FTIR and XRD spectrometry. It was found that the hydrolyzed-cellulose isolated was 92.4%, 94.6%, and 89.6%, respectively. The FTIR spectra provided the band for O-H (3435 cm−1) and C-O-C (1180-1060 cm−1) functional groups. However, the spectra also showed the C=C band for lignin impurities at 1661 cm−1. Furthermore, The XRD data gave similar 2-theta values for all hydrolyzed cellulose at 16°, 22°, and 34° respectively. The crystallite size was 18.34, 15.09, and 15.07 nm. Meanwhile, the crystallinity index was 50.50, 52.70, and 51.60% respectively.

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Sonication-Assisted Pine Cone Flower Cellulose Hydrolysis Using Formic Acid

Zakiyya

Uyunin

Masruri

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Preparation of Nanocellulose Bioplastic with a Gradation Color of Red and Yellow

Nasihin

Masruri

Warsito

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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A bioplastic derived from nanocellulose isolated from the pine flower (Pinus Merkusii) waste has been made. The red and yellow colors of bioplastic were afforded from the extract of dragon fruit and turmeric. Meanwhile, nanocellulose was hydrolyzed by citric acid using concentrations of 10%, 30%, and 60%, and obtained crystallinity index of 61.00%, 57.24%, and 52.82% respectively. Each nanocellulose applied has a crystallite size of 15.09 nm (calculated using XRD data with Scherrer’s equation). The result indicated that the increase in both dragon fruit and turmeric extracts concentration increase the red and yellow color intensity of the bioplastic. This study paves the way for further application of nanocellulose in bioplastic.

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Carbon-Supported Nickel Catalysts—Comparison in Alpha-Pinene Oxidation Activity

et al. 2023

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In this work, carbon-supported nickel catalysts with different Ni content (1, 2.5, 5, 10, and 20 wt%) were tested in the oxidation of alpha-pinene in solvent-free reaction conditions. The process of catalyst preparation consisted of two stages. In the first stage, the activated carbon from spent coffee grounds was obtained. In the second stage, the active phase in the form of nickel compounds was applied using two methods: (1) the impregnation of the material with the nickel salt solution, and next reduction in H2, and (2) the hydrothermal method in the autoclave using the reductor and the reaction stabilizer. The obtained catalysts were subjected to the following instrumental studies: FT-IR, XRD, SEM, and N2 adsorption at −196 °C. The performed catalytic tests showed that the catalysts containing 5 wt% of Ni (porous material obtained by the impregnation method) and 1 wt% of Ni (porous material obtained by the hydrothermal method) were the most active in the oxidation of alpha-pinene, and the main oxidation products were alpha-pinene oxide, verbenol, and verbenone. Ultimately, the hydrothermal method of catalyst preparation turned out to be more advantageous because it allows one to obtain higher selectivities of the epoxide compound, probably due to the greater stability of this organic compound in pores.

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Copper Nanoparticle Catalysed Aerobic Oxidation of α-pinene

Cited by 3 publications

References 18 publications

Sonication-Assisted Pine Cone Flower Cellulose Hydrolysis Using Formic Acid

Sonication-Assisted Pine Cone Flower Cellulose Hydrolysis Using Formic Acid

Preparation of Nanocellulose Bioplastic with a Gradation Color of Red and Yellow

Carbon-Supported Nickel Catalysts—Comparison in Alpha-Pinene Oxidation Activity

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