Abstract
Current views of the mechanism of the catalytic isomerization of α-pinene were discussed. Catalytic systems, modifiers, process conditions, and the effect of process conditions on catalytic activity and on the target-product (camphene, dipentene) selectivities of the process were considered. α-Pinene isomerization was investigated over a Belarussian natural aluminosilicate (Al-Si RB), its derivatives modified with HCl and H3PO4, modified diatomite (Al/Dia), and bentonite (ZSM-5/Ben). The commercial aluminosilicate catalyst AS-36 was used as a reference sample. Al-Si RB was treated with 10% HCl (50–250 ml/g) or 10% H3PO4 (50–100 ml/g) at 50°C for 3 h. α-Pinene was isomerized in a round-bottom flask with a backflow condenser under flowing nitrogen. The rotational speed of the stirrer was 10 rps. The highest catalytic activity and the highest camphene selectivity were observed for Al-Si RB treated with 50 ml/g of HCl. With activated Al-Si RB and As-36, 85% α-pinene conversion at 130°C and a catalyst concentration of 0.5 wt % was attained in 5.5 and 7 h, respectively. The camphene selectivity for Al-Si RB treated with 50 ml/g of HCl was 61%, being ∼20 and ∼10% higher than in the case of AS-36 and Al/Dia, respectively. Al-Si RB retained its catalytic activity for 70 h and could be fully regenerated with acetone.
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Original Russian Text © V.E. Agabekov, G.M. Sen’kov, A.Yu. Sidorenko, Nguyen Dinh Tuyen, Vu Anh Tuan, 2011, published in Kataliz v Promyshlennosti.
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Agabekov, V.E., Sen’kov, G.M., Sidorenko, A.Y. et al. New α-pinene isomerization catalysts. Catal. Ind. 3, 319–330 (2011). https://doi.org/10.1134/S2070050411040027
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DOI: https://doi.org/10.1134/S2070050411040027