Isomerization of limonene over natural zeolite-clinoptilolite

Retajczyk, Monika; Wróblewska, Agnieszka; Szymańska, Alicja; Michalkiewicz, Beata

doi:10.1180/clm.2019.18

Cited by 15 publications

(13 citation statements)

References 27 publications

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“…Fig. 8 The mechanism of the isomerization of S-carvone Taking into account the literature data [11,12] and our previous studies [27,29] on the isomerization of limonene we can proposed the following mechanism of the isomerization of S-carvone to carvacrol- Fig. 8.…”

Section: Resultsmentioning

confidence: 88%

“…In our earlier work, we included the full characteristics of clinoptilolite also used in the studies presented in this work [27]. It showed that the main elements occurring in clinoptilolite were: Si (32.7%), Al (about 5.5%), Ca (3.2%), K (2.1%) and Fe (2.0%)-the SEM-EDX method.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD pattern of clinoptilolite showed that this material was well crystallized and was well fitted to the literature data. The N2 adsorption/desorption isotherm prepared at 77 K for clinoptilolite showed that the isotherm for this porous material was of mixed types II and IV with an H3-type hysteresis loop [27]. In addition, we determined by the titration method (for this article only) the total number of acidic sites (the sum of Brønsted and Lewis acidic sites) in the clinoptilolite which we used.…”

Section: Resultsmentioning

confidence: 99%

“…A full characteristic clinoptilolite which was used in our studies was presented in our previous work [27]. In addition, we determined the total number of acidic sites (the sum of Brønsted and Lewis acidic sites) in the clinoptilolite by the method described by Vilcocq et al [28].…”

Section: Raw Materialsmentioning

confidence: 99%

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The isomerization of S-carvone over the natural clinoptilolite as the catalyst: the influence of reaction time, temperature and catalyst content

Wróblewska

Retajczyk

2020

Reac Kinet Mech Cat

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This work describes the isomerization of S-carvone using a natural zeolite-clinoptilolite as the catalyst. The isomerization of S-carvone was carried out at the catalyst content in the reaction mixture from 5 to 15 wt%, in a temperature range of 190-210 °C and for the reaction time from 60 to 300 min. The main product of the isomerization of S-carvone was aromatic alcohol with many practical applicationscarvacrol. The use of the most favorable reaction conditions (the reaction time of 3 h, the temperature of 210 °C and the catalyst content 15 wt%) allowed to obtain this compound with high yield amounted to about 90 mol%. The S-carvone isomerization is an example of environmentally friendly process because it does not use any solvents, S-carvone can be separated from cheap cumin waste (renewable biomass) and a cheap zeolite of natural origin-clinoptilolite can be is used as the catalyst.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Raw Materialsmentioning

confidence: 99%

See 2 more Smart Citations

The isomerization of S-carvone over the natural clinoptilolite as the catalyst: the influence of reaction time, temperature and catalyst content

Wróblewska

Retajczyk

2020

Reac Kinet Mech Cat

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“…Limonene is an organic compound present in orange oil, which is produced from orange peels, a waste biomass from the orange juice industry [ 60 , 61 ]. Limonene is used as the raw material for obtaining many intermediates in laboratory organic chemistry and in the chemical industry, as well as a solvent for reactions performed with organic compounds, because it is not only cheap, but also biodegradable and not very toxic [ 62 ].…”

Section: Introductionmentioning

confidence: 99%

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

et al. 2021

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This work presents studies on the preparation of porous carbon materials from waste biomass in the form of orange peels, coffee grounds, and sunflower seed husks. The preparation of activated carbons from these three waste materials involved activation with KOH followed by carbonization at 800 °C in an N2 atmosphere. This way of obtaining the activated carbons is very simple and requires the application of only two reactants. Thus, this method is cheap, and it does not generate much chemical waste. The obtained activated carbons were characterized by XRD, SEM, XPS, and XRF methods. Moreover, the textural properties, acidity, and catalytic activity of these materials were descried. During catalytic tests carried out in the alpha-pinene isomerization process (the use of the activated carbons thus obtained in the process of alpha-pinene isomerization has not been described so far), the most active were activated carbons obtained from coffee grounds and orange peels. Generally, the catalytic activity of the obtained materials depended on the pore size, and the most active activated carbons had more pores with sizes of 0.7–1.0 and 1.1–1.4 nm. Moreover, the presence of potassium and chlorine ions in the pores may also be of key importance for the alpha-pinene isomerization process. On the other hand, the acidity of the surface of the tested active carbons did not affect their catalytic activity. The most favorable conditions for carrying out the alpha-pinene isomerization process were the same for the three tested activated carbons: temperature 160 °C, amount of the catalyst 5 wt.%, and reaction time 3 h. Kinetic studies were also carried out for the three tested catalysts. These studies showed that the isomerization over activated carbons from orange peels, coffee grounds, and sunflower seed husks is a first-order reaction.

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Novel palladium nanoparticles supported on mesoporous natural phosphate: Catalytic ability for the preparation of aromatic hydrocarbons from natural terpenes

Mekkaoui

Aberkouks²,

Fkhar³

et al. 2020

Applied Organom Chemis

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Various ratios of palladium nanoparticles supported on mesoporous natural phosphate (Pd@NP) were prepared using the wetness impregnation method. The prepared catalysts were characterized by IR, XRD, CV, SEM, EDX, XRF, TEM and BET analysis. The reduction and preparation of the palladium nanoparticles afford a crystallite size of 10.88 nm. The performance of the synthesized catalyst was investigated in the solvent-free dehydroaromatization of α-, βand γ-himachalene mixture from Cedrus atlantica oil as a model substrate. In order to achieve an efficient and selective catalysis, the catalytic dehydroaromatization of various terpenes such as limonene, limonaketone, carvone, carveol and perillyl alcohol was studied. The Pd@NP catalyst performed a high catalytic activity, selectivity and recyclability in the terpenes dehydroaromatization reaction.

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Isomerization of limonene over natural zeolite-clinoptilolite

Cited by 15 publications

References 27 publications

The isomerization of S-carvone over the natural clinoptilolite as the catalyst: the influence of reaction time, temperature and catalyst content

The isomerization of S-carvone over the natural clinoptilolite as the catalyst: the influence of reaction time, temperature and catalyst content

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

Novel palladium nanoparticles supported on mesoporous natural phosphate: Catalytic ability for the preparation of aromatic hydrocarbons from natural terpenes

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