Catalytic Material with Enhanced Contacting Efficiency for Volatile Organic Compound Removal at Ultrashort Contact Time

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• 作者：Sabrina Wahid ; Bruce J. Tatarchuk
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：November 6, 2013
• 年：2013
• 卷：52
• 期：44
• 页码：15494-15503
• 全文大小：598K
• 年卷期：v.52,no.44(November 6, 2013)
• ISSN：1520-5045

文摘

A unique catalyst structure, microfibrous entrapped catalyst (MFEC), was prepared by entrapping support particles (纬-Al₂O₃, 150鈥?50 渭m diam) into metal (Ni-200) microfibers and forming thin flexible sheets. Pleated structures of MFECs containing Pd/纬-Al₂O₃, Pd鈥揗n/纬-Al₂O₃, and Pd鈥揅e/纬-Al₂O₃ were investigated systematically for volatile organic compound (VOC) removal at various face velocities (ca. 3鈥?0 m/s) and at low temperatures (<473 K). The optimized structure of MFEC (e.g., W-structure with 8 渭m Ni fiber) resulted intralayer residence times from 750 to 65 渭s with pressure drops from 0.35 to 10.22 kPa. The study exhibited that low intralayer residence times had a significant effect on the catalytic reaction which followed the Mars鈥揤an Krevelen mechanism in this velocity controlled region. The overall reaction rate for VOC removal was limited by the surface reaction. Furthermore, mixed metal oxide based MFECs showed better performance in VOC removal due to the high oxygen storage capacity of reducible oxides. The performance of pleated MFEC was calculated in terms of heterogeneous contacting efficiency (畏_HCE), which relies on the logarithmic removal of reactant concentrations per unit of the pressure drop.