Impact of Pt and V2O5 on Ethanol Removal from Moist Air Using Pellet Silica-Bound NaY

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• 作者：Ming-Chun Liu ; Chu-Chin Hsieh ; Jyh-Fu Lee ; Jen-Ray Chang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：54
• 期：35
• 页码：8678-8689
• 全文大小：532K
• ISSN：1520-5045

文摘

The performances of NaY-SiO₂, Pt/NaY-SiO₂, and V₂O₅/NaY-SiO₂ in removing ethanol from water containing air stream were investigated using a fixed-bed adsorber. The adsorption capacity of Pt/NaY-SiO₂ is much greater than those of NaY-SiO₂ and V₂O₅/NaY-SiO₂, even though the adsorption rate was lower. To elucidate the causes of difference in the performance, the surface species on the adsorbents were characterized by using XAS and FT-IR. The results indicate that active Pt clusters on NaY not only adsorb ethanol but also catalytically convert the adsorbed ethanol to ethoxides and aldehyde. Those Pt adsorbed species could spillover to displace sodium and acid site bound water, leaving the Pt clusters for further adsorption, and thus increase ethanol adsorption capacity. However, the adsorption process involves slow diffusion of the surface species from Pt clusters to NaY-SiO₂, resulting in lower overall adsorption rate. In contrast, the VO₄ species formed on NaY-SiO₂ just covers up the adsorption sites without adsorption capability, leading to decrease in adsorption capacity.