Selective Oxofunctionalization of Cyclohexene over Titanium Dioxide-Based and Bismuth Oxyhalide Photocatalysts by Visible Light Irradiation

Catalysts

Lorena Cornejo-Ponce¹  Adolfo Henríquez¹  Eduardo Schott²  Héctor D. Mansilla³  David Contreras³  Azael Martínez–de la Cruz⁴ 

[1] Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez 1775, Arica 1000007, Chile;Departamento de Química Inorgánica, Facultad de Química y Farmacia, Centro de Energía UC, Centro de Investigación en Nanotecnología y Materiales Avanzados CIEN-UC, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago 7820436, Chile;Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4070386, Chile;Faculty of Mechanic and Electric Engineering, Autonomous University of Nuevo León, University Village, San Nicolás de los Garza 66451, Nuevo León, Mexico;

关键词: titanium dioxide;    bismuth oxyhalide;    cyclohexene;    photocatalysis;    oxofunctionalization;   

DOI  :  10.3390/catal10121448

来源: DOAJ

【 摘 要 】

Photocatalysis driven under visible light allows us to carry out hydrocarbon oxofunctionalization under ambient conditions, using molecular oxygen as a sacrificial reagent, with the absence of hazardous subproducts and the potential use of the Sun as a clean and low-cost source of light. In this work, eight materials—five based on titanium dioxide and three based on bismuth oxyhalides—were used as photocatalysts in the selective oxofunctionalization of cyclohexene. The cyclohexane oxofunctionalization reactions were performed inside of a homemade photoreactor equipped with a 400 W metal halide lamp and injected air as a source of molecular oxygen. In all assayed systems, the main oxygenated products, identified by mass spectrometry, were 1,2-epoxycyclohexane, 2-cyclohexen-1-ol, and 2-cyclohexen-1-one. Titanium dioxide-based materials exhibited higher selectivities for 1,2-epoxycyclohexane than bismuth oxyhalide-based materials. In addition to this, titanium dioxide doped with iron exhibited the best selectivity for 1,2-epoxycyclohexane, demonstrating that iron plays a relevant role in the cyclohexene epoxidation process.

【 授权许可】

Unknown