Catalysis by the entangled complexes in matrix structure of zeolite-Y over α-pinene

• Published in: Microporous and mesoporous materials Vol. 242; pp. 245 - 255
• Main Authors: Desai, Nisheeth C., Chudasama, Jiten A., Patel, Bonny Y., Jadeja, Krunalsinh A., Karkar, Tushar J., Mehta, Jignasu P., Godhani, Dinesh R.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-04-2017
• Subjects: Entangled complexes; Heterogeneous catalysis; Zeolite-Y; α-pinene oxidation; α-pinene oxidation; Heterogeneous catalysis; Entangled complexes; Zeolite-Y
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2017.01.023

Zeolite-Y entangled complexes based heterogeneous catalysts of VO(IV), Mn(II), Fe(II), Co(II), Ni(II) and Cu(II) and Schiff base ligand HMIMMPP = 4-(((2-hydroxy-5-methylphenyl)imino)methyl)-3-methyl-1-phenyl-1H-pyrazol-5-ol were prepared. The products were characterized by BET, FTIR, elemental analysis, SEM, thermogravimetric analysis, XRD and UV–Vis analysis. All entangled complexes and their neat complexes were utilized in the catalysis of α-pinene via tBuOOH as oxidative agent. α-pinene yielded verbenol and verbenone as major products due to the oxidative reaction. Conversion of products from reactant were in decreasing order as: [VO(HMIMMPP)(H2O)]-Y > [VO(HMIMMPP)(H2O)] > [Co(HMIMMPP)(H2O)]-Y > [Cu(HMIMMPP)(H2O)]-Y > [Ni(HMIMMPP)(H2O)]-Y > VO-Y > [Fe(HMIMMPP)(H2O)3]-Y > [Mn(HMIMMPP)(H2O)3]-Y > Na-Y. The entangled catalysts showed no metal leaching, easily recovery and reusability.
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•Neat and their entangled complexes into the nanopores of zeolite-Y were synthesized.•The comparative studies of spectroscopic, thermal and textural properties of complexes were achieved.•The catalytic activities were tried over oxidation of α-pinene reaction using TBHP as an oxidizing agent.•The reaction parameters were optimized for higher oxidation with higher selectivity towards allylic products.•[VO(HMIMMPP)(H2O)]-Y catalyst showed higher catalytic activity with 41.84% selectivity of verbenol.