204. High Efficiency Adsorbent Filters for Regenerable Collective Protection Using Packed Bed + Polishing Sorbent Architectures

Queen, Aimee; Tatarchuk, Bruce J.

doi:10.3320/1.2758561

Cited by 2 publications

(1 citation statement)

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“…Microfibrous entrapped ZnO/SiO 2 adsorbent has exhibited improved performance (2–3-fold) over packed bed in gas phase desulfurization of hydrogen reformate streams. − Moreover, Chang et al has viewed MFEC as a remarkable material for preferential catalytic oxidation and low temperature oxidation of CO in hydrogen reformate streams. Furthermore, microfibrous entrapped activated carbon beds and Ni/Al 2 O 3 catalysts have shown significant benefits in volatile organic compound (VOC) adsorption , and in toluene hydrogenation for trickle bed reactors . Sheng et al has observed remarkable improvement in temperature distribution as well as product selectivity in Fischer–Tropsch synthesis due to the presence of metal fibers in MFECs.…”

Section: Introductionmentioning

confidence: 99%

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

Wahid

Tatarchuk

2013

Ind. Eng. Chem. Res.

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A unique catalyst structure, microfibrous entrapped catalyst (MFEC), was prepared by entrapping support particles (γ-Al2O3, 150–250 μm diam) into metal (Ni-200) microfibers and forming thin flexible sheets. Pleated structures of MFECs containing Pd/γ-Al2O3, Pd–Mn/γ-Al2O3, and Pd–Ce/γ-Al2O3 were investigated systematically for volatile organic compound (VOC) removal at various face velocities (ca. 3–30 m/s) and at low temperatures (<473 K). The optimized structure of MFEC (e.g., W-structure with 8 μm Ni fiber) resulted intralayer residence times from 750 to 65 μs 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–Van 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 (ηHCE), which relies on the logarithmic removal of reactant concentrations per unit of the pressure drop.

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