https://scholars.lib.ntu.edu.tw/handle/123456789/338752
Title: | VOC deep oxidation over Pt catalysts using hydrophobic supports | Authors: | Wu, Jeffrey Chi-Sheng Chang, Tai-Yuan JEFFREY CHI-SHENG WU |
Keywords: | Activated carbon; Catalytic oxidation; Hydrophobic supports; Pt catalyst; SDB; Toluene; VOC | Issue Date: | 1998 | Journal Volume: | 44 | Journal Issue: | 1-4 | Start page/Pages: | 111-118 | Source: | Catalysis Today | Abstract: | The active hydrophobic-supported Pt catalysts were synthesized for VOC deep oxidation at low temperature (less than 200°C). The destruction of VOC could cost less at lower temperature due to less energy consumption. The advantage using hydrophobic support was that moistures from atmosphere and oxidation would not be adsorbed on the surface. Thus the active sites would not be cloaked and catalyst activity could be maintained, especially at low temperature. The hydrophobicity of supports was characterized by wetting angles. Porous SDB (styrene divinylbenzene copolymer) was found near 113°, indicating high hydrophobicity. Three Pt catalysts were prepared on SDB and activated carbons by incipient wetness method. Specific surface areas were measured by nitrogen adsorption. The thermal stability of SDB catalyst was examined by TGA, and found no degradation below 200°C in air. The surface compositions of catalysts were analyzed by EDS. XRD showed that Pt was well dispersed on supports after hydrogen reduction at 160°C. The chemical states of Pt were investigated by XPS, and suggested that the oxidized PtIV might be the active sites in the reaction. The deep oxidation of toluene/air mixture was carried out to test the activity of catalysts. Pt/SDB showed the highest activity among the catalysts and could completely oxidize 90 ppm toluene/air at VHSV=21 000 h-1, 150°C. Redox mechanism was proposed to reveal the enhanced kinetic rates. The results suggested that the rate of toluene oxidation might be enhanced due to the fact that water, one of the products, was expelled from the hydrophobic surface. © 1998 Elsevier Science B.V. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0001234232&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/338752 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001234232&doi=10.1016%2fs0920-5861%2898%2900179-5&partnerID=40&md5=58ed79d9da808ab455199bfe8134690d |
ISSN: | 09205861 |
Appears in Collections: | 化學工程學系 |
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