Studies of the effect of pressure and hydrogen permeance on the ethanol steam reforming reaction with palladium- and silica-based membranes
Studies of the effect of pressure and hydrogen permeance on the ethanol steam reforming reaction with palladium- and silica-based membranes
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DOI：
10.1016/j.memsci.2012.01.004
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发表时间：
2012-04
影响因子：
9.5
通讯作者：
Hankwon Lim;Yunfeng Gu;S. Oyama
中科院分区：
文献类型：
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作者：
Hankwon Lim;Yunfeng Gu;S. Oyama
在1- 10 atm、623 K条件下，研究了氢渗透率和选择性对乙醇水蒸气重整反应器性能的影响。通过在多孔氧化铝载体上沉积选择性渗透组分，并添加中间层，制备了Pd-Cu和SiO2-Al 2 O3复合膜。在623 K下，膜的氢渗透率在5.2×10− 8到3.9×10− 6 molm −2s− 1 Pa − 1之间变化，选择性在200到1000（H2/CO2）之间，这使得可以探测广泛的条件。与填充床反应器（PBR）和膜反应器（MR）操作的比较研究表明，较高的乙醇转化率和氢气摩尔流量在MR中获得的所有压力研究。据确定，氢渗透性和选择性对EtOHSR反应具有有利的影响，在装有具有最高氢渗透性的膜的MR中获得了44%的最高乙醇转化率增强和69%的氢摩尔流量增强。提出了工业应用中所需渗透率的标准，对于直径为1cm的膜管，该标准为2.5×10 - 7 molm-2s-1 Pa-1。
The effects of hydrogen permeance and selectivity in the performance of membrane reactors for the ethanol steam reforming (EtOHSR) were studied at 1–10atm and 623K. The studies were performed with Pd–Cu and SiO2–Al2O3composite membranes prepared by depositing the permselective components onto porous alumina supports with intermediate layers. The hydrogen permeances of the membranes varied from 5.2×10−8to 3.9×10−6molm−2s−1Pa−1and the selectivity ranged from 200 to 1000 (H2/CO2) at 623K, which allowed a broad set of conditions to be probed. Comparison studies with packed-bed reactor (PBR) and membrane reactor (MR) operation showed that higher ethanol conversions and hydrogen molar flows were obtained in the MRs for all pressures studied. It was determined that both hydrogen permeance and selectivity had a favorable effect on the EtOHSR reaction, with the highest ethanol conversion enhancement of 44% and hydrogen molar flow enhancement of 69% obtained in a MR fitted with a membrane with the highest hydrogen permeance. A criterion for the required permeance for industrial applications is developed, which for 1cm diameter membrane tubes is 2.5×10−7molm−2s−1Pa−1.