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Bifunctional Nb/Ti-MCM-41 Catalyst in Oxidative Acidic Reaction of Cyclohexene to Diol

Zainab Ramli, and Mazidah Abdul Shukor, and Prasetyoko, Didik (2007) Bifunctional Nb/Ti-MCM-41 Catalyst in Oxidative Acidic Reaction of Cyclohexene to Diol. Malaysian Journal of Analytical Sciences, 11 (1). pp. 117-123. ISSN 13942506

Full text not available from this repository.

Official URL: http://pkukmweb.ukm.my/~mjas/v11_n1/18_293C6-IR-bifunctionalcatalyst-1.pdf

Affiliations

Universiti Teknologi Malaysia, Faculty of Science, Dept. of Chemistry

Abstract

Bifunctional oxidative and acidic catalyst was prepared by incorporating titanium ion (Ti4+) and niobic acid in mesoporous molecular sieves MCM -41 structure. The catalyst is active both in oxidation, and acid-catalyzed reaction of olefin to diol. Nb/Ti-MCM-41 catalyst was prepared by first synthesizing Ti-MCM-41 by hydrothermal method, followed by subsequent impregnation of niobic acid (Nb) into Ti-MCM-41 at various %wt Nb loading. The framework structure of Ti-MCM-41 collapsed after incorporation of Nb but the tetrahedral form of Ti4+ still maintained with octahedral Nb species. Both Brønsted and Lewis acid sites are present in all Nb/Ti-MCM-41 samples. The formation of cyclohexanediol in the epoxidation of cyclohexene proved the bifunctional oxidative and acidic catalyst through the formation of cyclohexane oxide. The yield increased with the increase amount of the Brønsted acid sites provided by niobium species.

Mangkin dwifungsi oksidatif berasid disediakan dengan memasukkan ion titanium (Ti4+) dan asid niobik dalam struktur penapis molekul mesoliang MCM-41. Mangkin aktif dalam kedua-dua tindak balas bermangkinkan pengoksidaan dan asid bagi olefin kepada diol. Mangkin Nb/Ti-MCM-41 disediakan bermula dengan mensintesis Ti-MCM-41 secara hidroterma, diikuti dengan pengisitepuan asid niobik (Nb) ke dalam Ti-MCM-41 pada berbagai % berat muatan Nb. Struktur bingkaian Ti-MCM-41 didapati runtuh selepas kemasukan Nb tetapi struktur tetrahedron Ti4+ masih kekal dengan spesies octahedron Nb. Kedua-dua tapak asid Brønsted dan Lewis hadir dalam semua sampel Nb/Ti-MVM -41. Pembentukan sikloheksandiol dalam pengepoksidaan sikloheksena membuktikan mangkin adalah dwifungsi oksidatif berasid melalui pembentukan sikloheksan oksida. Hasil bertambah dengan pertambahan tapak asid Brønsted yang disediakan oleh spesies niobium.

Item Type:Journal
Additional Information:Authors would like to thank the Malaysian Ministry of Science, Technology and Innovation (MOSTI) for funding under IRPA project No. 09-02-06-0057 SR0005/09-0.3
Keywords:bifunctional catalyst, Nb/TiMCM -41, oxidative-acidic, diol
Subjects:Q Science
ID Code:1029

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