Impact of Oxygen Vacancy on the Photocatalytic Selective Hydrogenation of 3-Nitrostyrene via Calcination of TiO2

2019 International Conference on Smart Materials Applications

Chaitaworn, Saknarin^1 ; Mekasuwandumrong, Okorn^2 ; Praserthdam, Piyasan^1

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok

10330, Thailand^1

Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom

73000, Thailand^2

关键词: Excess oxygen;    High conversions;    Optimal calcination;    Photo-catalytic;    Recombination centers;    Selective hydrogenation;    Trapped electrons;    UV-vis spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/559/1/012015/pdf
DOI  :  10.1088/1757-899X/559/1/012015

来源: IOP

【 摘 要 】

In this work, P25-TiO2 was treated by calcination in air at difference temperature (600-900°C) for 5h. Treated catalysts were tested in photocatalytic selective hydrogenation of 3-nitrostyrene (3-NS) to 3-vinylaniline (3-VA). The properties of treated catalysts were characterized by using XRD, XPS, and UV-Vis spectroscopy. 3-vinylaniline and acetone were produced from photocatalytic (λ > 300nm) selective hydrogenation reaction of 3-nitrostyrene in 2-propanol and suspension with P25-TiO2. The Ti3+ at locate with oxygen defect, which at below conduction band were acted as active site for trapped electron to conduction band. These effects leading to excess oxygen defect caused low activity due to recombination center. An optimal calcination temperature was 700°C ascribed to the enhancement of high conversion (71%) with 100% 3-VA selectivity due to optimal oxygen vacancies.