Compositional Effects of Nanocrystalline Lithium Zirconate on Its CO2 Capture Properties

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• 作者：Esther Ochoa-Fern&aacute ; ndez ; Magnus R//pubs.acs.org/images/gifchars/oslash.gif" border="0">nning ; Xiaofeng Yu ; Tor Grande ; De Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：January 16, 2008
• 年：2008
• 卷：47
• 期：2
• 页码：434 - 442
• 全文大小：364K
• 年卷期：v.47,no.2(January 16, 2008)
• ISSN：1520-5045

文摘

A soft-chemistry route has been used for preparation of pure and promoted nanocrystalline lithium zirconatewith different stoichiometries. The objective of this investigation has been to study the effect of differentcompositions on the acceptor and optimize the working properties of lithium zirconate. Special attention hasbeen given to study the effect of different Li₂O-ZrO₂ stoichiometries on the CO₂ capture rates. In addition,the partial substitution of Li₂O with K₂O as a promoter has been addressed. It has been found that both thecapture rate and capacity of lithium zirconate depend considerably on the Li₂O to ZrO₂ ratio. Enhanced capturerates are observed when a deficiency of Li₂O is introduced. It is believed that the excess ZrO₂ might act asa dispersant and introduce more reactive boundaries. Moreover, the addition of K₂O results also in improvedcapture rates due to the presence of molten carbonates, but lower capacities and poorer stability due to particlecoarsening. The present of free ZrO₂ seems also beneficial for the stability of K₂O-doped acceptors. Therefore,controlling the K:Li:Zr ratio has been found to be crucial for tailoring the properties of lithium zirconate. Anoptimized composition can result in an acceptor with enhanced capture rates, stability, and higher degree ofutilization.