铑离子修饰的二氧化钛光催化剂水悬浮液在可见光照射下对醇的选择性氧化

Selective oxidation of alcohols in aqueous suspensions of rhodium ion-modified TiO2 photocatalysts under irradiation of visible light.

作者信息

Kitano Sho, Tanaka Atsuhiro, Hashimoto Keiji, Kominami Hiroshi

机构信息

Interdisciplinary Graduate School of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashiosaka, Osaka 577-8502, Japan.

出版信息

Phys Chem Chem Phys. 2014 Jun 28;16(24):12554-9. doi: 10.1039/c4cp00863d.

DOI:10.1039/c4cp00863d

PMID:24832087

Abstract

Photocatalytic oxidation of benzyl alcohols in aqueous suspensions of rhodium ion-modified titanium(iv) oxide (Rh(3+)/TiO2) in the presence of O2 under irradiation of visible light was examined. In the photocatalytic oxidation of benzyl alcohol, benzaldehyde was obtained in a high yield (97%) with >99% conversion of benzyl alcohol. Rh(3+)/TiO2 photocatalysts having various physical properties were prepared using commercially available TiO2 powders as supporting materials for Rh(3+) to investigate the effect(s) of physical properties of TiO2 on photocatalytic activities of Rh(3+)/TiO2 for selective oxidation. Adsorption properties of benzyl alcohol, benzaldehyde and benzoic acid on TiO2 were also investigated to understand the high benzaldehyde selectivity over the Rh(3+)/TiO2 photocatalyst. The reaction mechanism was discussed on the basis of the results of photocatalytic oxidation of various p-substituted benzyl alcohol derivatives.

摘要

研究了在可见光照射下，铑离子改性的二氧化钛（Rh(3+)/TiO2）水悬浮液中，氧气存在时苯甲醇的光催化氧化反应。在苯甲醇的光催化氧化反应中，苯甲醇的转化率>99%，苯甲醛的收率很高（97%）。以市售二氧化钛粉末为Rh(3+)的载体材料，制备了具有不同物理性质的Rh(3+)/TiO2光催化剂，以研究二氧化钛的物理性质对Rh(3+)/TiO2选择性氧化光催化活性的影响。还研究了苯甲醇、苯甲醛和苯甲酸在TiO2上的吸附性能，以了解Rh(3+)/TiO2光催化剂对苯甲醛的高选择性。基于各种对取代苯甲醇衍生物的光催化氧化结果，讨论了反应机理。