| Title: | A comparison between the four Geldart groups on the performance of a gas-phase annular fluidized bed photoreactor for volatile organic compound oxidation |
| Author(s): | Diniz LA; Hewer TLR; Matsumoto D; Teixeira A; |
| Address: | "Research Group in Advanced Oxidation Processes (AdOx), Chemical Systems Engineering Center, Department of Chemical Engineering, University of Sao Paulo, Av. Prof. Luciano Gualberto, tr. 3, Sao Paulo, SP, 380, Brazil. leonardo.diniz49@gmail.com. Chemical Systems Engineering Center (CESQ), Department of Chemical Engineering, University of Sao Paulo, Av. Prof. Luciano Gualberto, tr. 3, Sao Paulo, SP, 380, Brazil. Research Group in Advanced Oxidation Processes (AdOx), Chemical Systems Engineering Center, Department of Chemical Engineering, University of Sao Paulo, Av. Prof. Luciano Gualberto, tr. 3, Sao Paulo, SP, 380, Brazil" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-018-2145-5 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Heterogeneous photocatalytic oxidation (PCO) is a widely studied alternative for the elimination of volatile organic compounds (VOC) in air. In this context, research on novel photoreactor arrangements to enhance PCO rates is desired. Annular fluidized bed photoreactors (AFBPR) have yielded prominent results when compared to conventional thin film reactors. However, very few works aimed at optimizing AFBPR operation. In this study, TiO(2) photocalytic agglomerates were synthesized and segregated in specific size distributions to behave as Geldart groups A, B, C, and D fluidization. The TiO(2) agglomerates were characterized by XRD, FTIR spectra, and N(2) adsorption. Photocatalyst performances were compared in a 10-mm gapped AFBPR for degrading the model pollutant methyl-ethyl-ketone (MEK), using a 254-nm radiation source. Geldart group C showed to be inadequate for AFBPR operation due to the short operation range between fluidization and elutriation. In all the cases, photocatalytic reaction rates were superior to sole UV photolysis. Group A and group B demonstrated the highest reaction rates. Considerations based on mass transfer suggested that the reasons were enhanced UV distribution within the bed at lower flow rates and superior catalyst surface area at higher flow rates. Results also revealed that groups A, B, and D perform equally per catalyst area within an AFBPR if the fluidization numbers (FN) are high enough" |
| Keywords: | "Adsorption Air Pollutants/*analysis/radiation effects Butanones/*analysis/radiation effects Catalysis Models, Theoretical Oxidation-Reduction *Photolysis Titanium/*chemistry Volatile Organic Compounds/*analysis/radiation effects Air treatment Fluidized be;" |
| Notes: | "MedlineDiniz, Leonardo Almeida Hewer, Thiago Lewis Reis Matsumoto, Danielle Teixeira, Antonio Carlos Silva Costa eng 3300201/Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior/ 168640/2017-1/Conselho Nacional de Desenvolvimento Cientifico e Tecnologico/ 2016/00953-6/Fundacao de Amparo a Pesquisa do Estado de Sao Paulo/ Germany 2018/05/08 Environ Sci Pollut Res Int. 2019 Feb; 26(5):4242-4252. doi: 10.1007/s11356-018-2145-5. Epub 2018 May 7" |
