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首页> 外文期刊>Journal of Materials Engineering and Performance >Facile Regeneration Vitreous Microfibrous Entrapped Supported ZnO Sorbent with High Contacting Efficiency for Bulk H_2S Removal from Reformate Streams in Fuel Cell Applications
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Facile Regeneration Vitreous Microfibrous Entrapped Supported ZnO Sorbent with High Contacting Efficiency for Bulk H_2S Removal from Reformate Streams in Fuel Cell Applications

机译：易于再生的玻璃态微纤维截留负载型ZnO吸附剂，具有高接触效率，可从燃料电池应用中从重整物流中大量去除H_2S

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摘要

In this study, a microfibrous carrier consisting of 3 vol. percent of 8 mu m (diameter) glass fibers is used to entrap 45 vol. percent of 150 to 250 mu m (diameter) SiO_2 support particulates. ZnO is then nanodispersed onto the support by impregnation at the loading of 17 wt. percent. At equivalent bed volumes, ZnO/SiO_2-entrapped materials provide twofold longer breakthrough times for H_2S (with a 67 percent reduction in sorbent loading) compared with packed beds of 1 to 2 mm commercial extrudates. Five-log reductions in H_2S concentration with up to 75 percent ZnO utilization at breakthrough are achieved. H_2S concentrations from 60 to 2000 parts per million in volume (ppmv) can be reduced to as little as 0.6 ppmv at 400 deg C in 30 percent H_2O at a face velocity of 1.7 cm/s for layers as thin as 1.0 mm. At 500 to 600 deg C, ZnO/SiO_2-entrapped materials provide much higher regenerability in air than do 1 to 2 mm commercial extrudates. The use of glass fibers permits greater than 50 regeneration cycles.
机译：在这项研究中，微纤维载体由3卷。 8毫米（直径）的玻璃纤维的百分之一被用来捕获45体积。 150至250微米（直径）的SiO_2载体颗粒的百分率。然后通过以17wt。％的负载浸渍将ZnO纳米分散在载体上。百分。在相同的床体积下，与1-2 mm商用挤出物的填充床相比，包埋ZnO / SiO_2的材料对H_2S的穿透时间延长了两倍（吸附剂负载减少了67％）。在突破时，H_2S浓度降低了5个对数，同时ZnO利用率高达75％。对于厚度为1.0 mm的层，在1.7 cm / s的面速度下，在30％H_2O中，在400摄氏度下，H_2S浓度从百万分之60（ppmv）到2000 ppm可以降低到0.6 ppmv。在500至600摄氏度下，包裹ZnO / SiO_2的材料在空气中的可再生性要比1至2毫米的商用挤出物高得多。玻璃纤维的使用允许大于50个再生周期。

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