Characterization of ZHY and TCA/ZHY Catalysts for Hydration of α-Pinene

Wijayati, Nanik; Pranowo, Harno Dwi; Jumina,; Triyono, Triyono; Chuah, Gaik‐Khuan

doi:10.7763/ijcea.2013.v4.289

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…Wijayati et al prepared a catalyst by impregnating TCA on a Y-zeolite molecular sieve for the synthesis of terpineol from alpha-pinene [ 13 ]. Wijayati et al also prepared a TCA/ZHY catalyst (Si/Al = 3.25) via impregnation to achieve terpineol synthesis [ 14 ]. Ávila et al prepared catalysts for pinene hydration by impregnating TCA on SiO 2 , TiO 2 , and ZrO 2 ·nH 2 O [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Terpineol from Alpha-Pinene Catalyzed by α-Hydroxy Acids

et al. 2022

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We report the use of five alpha-hydroxy acids (citric, tartaric, mandelic, lactic and glycolic acids) as catalysts in the synthesis of terpineol from alpha-pinene. The study found that the hydration rate of pinene was slow when only catalyzed by alpha-hydroxyl acids. Ternary composite catalysts, composed of AHAs, phosphoric acid, and acetic acid, had a good catalytic performance. The reaction step was hydrolysis of the intermediate terpinyl acetate, which yielded terpineol. The optimal reaction conditions were as follows: alpha-pinene, acetic acid, water, citric acid, and phosphoric acid, at a mass ratio of 1:2.5:1:(0.1–0.05):0.05, a reaction temperature of 70 °C, and a reaction time of 12–15 h. The conversion of alpha-pinene was 96%, the content of alpha-terpineol was 46.9%, and the selectivity of alpha-terpineol was 48.1%. In addition, the catalytic performance of monolayer graphene oxide and its composite catalyst with citric acid was studied, with acetic acid used as an additive.

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Section: Introductionmentioning

confidence: 99%

“…Wijayati et al also prepared a TCA/ZHY catalyst (Si/Al = 3.25) via impregnation to achieve terpineol synthesis[14]. Ávila et al prepared catalysts for pinene hydration by impregnating TCA on SiO2, TiO2, and ZrO2•nH2O[15].…”

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confidence: 99%

Synthesis of Terpineol from Alpha-Pinene Catalyzed by α-Hydroxy Acids

et al. 2022

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“…Taking into account the pore size of the tested samples ( Figure 2 , Table 2 ), i.e., 0.4–0.7 nm, 0.7–1.0 nm, 1.1–1.4 nm, and 1.5–2.5 nm, and the number of pores, we can conclude that the C_AC and O_AC samples had the largest number of pores with a size of 0.7–1.0, 1.1–1.4 nm and 1.5–2.5 nm, whereas the S_AC sample had the largest number of pores with a size of 0.4–0.7 nm. The size of the alpha-pinene molecule is about 0.7 nm [ 95 ]; thus, pores with a size of 0.7–1.0 and 1.1–1.4 nm or larger are of greatest importance for the isomerization process of this compound. The results in Figure 2 , thus, confirm that the catalyst samples C_AC and O_AC allowed diffusion of alpha-pinene molecules into the interior of the pores, where the investigated reaction took place, and that these catalyst samples should be the most active in the process.…”

Section: Resultsmentioning

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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“…Wijayati et al prepared a catalyst by impregnating trichloroacetic acid (TCA) on a Y-zeolite molecular sieve for the synthesis of terpineol from α-pinene [ 5 ]. Wijayati et al also prepared a TCA/ZHY catalyst via impregnation to achieve terpineol synthesis [ 6 ], and Ávila et al prepared catalysts for α-pinene hydration by impregnating TCA on SiO 2 , TiO 2 , and ZrO 2 ·nH 2 O [ 7 ]. Sekerová et al treated montmorillonite K10 with several acids (H 2 SO 4 , HCl, HNO 3 , and MCA) to catalyze the hydration of α-pinene [ 8 ], and Comelli et al prepared a catalyst for α-pinene hydration by impregnating natural clay with MCA [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts

et al. 2023

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In this study, seven types of α-hydroxycarboxylic acids were selected to form composite catalysts with boric acid, and their catalytic properties were studied using the catalytic hydration of α-pinene. The results showed that the composite catalyst of boric acid and tartaric acid had the highest catalytic activity. With an α-pinene, water, acetic acid, tartaric acid, and boric acid mass ratio of 10:10:25:0.5:0.4, the reaction temperature was 60 °C, the reaction time was 24 h, the conversion of α-pinene was 96.1%, and the selectivity of terpineol was 58.7%. The composite catalyst composed of boric acid and mandelic acid directly catalyzed the hydration of α-pinene in the absence of a solvent. Under the optimal conditions, the conversion of α-pinene reached 96.1%, and the selectivity of terpineol was 55.5%. When the composite catalyst catalyzed α-pinene to synthesize terpineol in one step, the terpineol was optically active, and terpineol synthesized using the two-step method with the dehydration of p-menthane-1,8-diol monohydrate was racemic. These composite catalysts may offer good application prospects in the synthesis of terpineol.

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Characterization of ZHY and TCA/ZHY Catalysts for Hydration of α-Pinene

Cited by 5 publications

References 18 publications

Synthesis of Terpineol from Alpha-Pinene Catalyzed by α-Hydroxy Acids

Synthesis of Terpineol from Alpha-Pinene Catalyzed by α-Hydroxy Acids

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

Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts

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