A comparison between the four Geldart groups on the performance of a gas-phase annular fluidized bed photoreactor for volatile organic compound oxidation

Autor(es)

Diniz, Leonardo Almeida ^[1] ; Reis Hewer, Thiago Lewis ^[2] ; Matsumoto, Danielle ^[1] ; Silva Costa Teixeira, Antonio Carlos ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Chem Engn, Chem Syst Engn Ctr, Res Grp Adv Oxidat Proc AdOx, Av Prof Luciano Gualberto Tr 3, BR-380 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Dept Chem Engn, Chem Syst Engn Ctr CESQ, Av Prof Luciano Gualberto Tr 3, BR-380 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 26, n. 5, p. 4242-4252, FEB 2019.
• Citações Web of Science: 2

Resumo

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, TiO2 photocalytic agglomerates were synthesized and segregated in specific size distributions to behave as Geldart groups A, B, C, and D fluidization. The TiO2 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. (AU)

• Processo FAPESP: 16/00953-6 - Desenvolvimento de reator fotocatalítico para tratamento de gases contaminados com compostos orgânicos voláteis
• Beneficiário: Danielle Matsumoto
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisa Inovativa em Pequenas Empresas - PIPE